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Jin Y, Zhai ZW, Sun LT, Xia PD, Hu H, Jiang CQ, Zhao BC, Qu H, Qian Q, Dai Y, Yao HW, Wang ZJ, Han JG. [Construction of a model based on multipoint full-layer puncture biopsy for predicting pathological complete response after neoadjuvant therapy for locally advanced rectal cancer]. Zhonghua Wei Chang Wai Ke Za Zhi 2024; 27:403-411. [PMID: 38644246 DOI: 10.3760/cma.j.cn441530-20240101-00002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 04/23/2024]
Abstract
Objective: To investigate the value of transanal multipoint full-layer puncture biopsy (TMFP) in predicting pathological complete response (pCR) after neoadjuvant radiotherapy and chemotherapy (nCRT) in patients with locally advanced rectal cancer (LARC) and to establish a predictive model for providing clinical guidance regarding the treatment of LARC. Methods: In this multicenter, prospective, cohort study, we collected data on 110 LARC patients from four hospitals between April 2020 and March 2023: Beijing Chaoyang Hospital of Capital Medical University (50 patients), Beijing Friendship Hospital of Capital Medical University (41 patients), Qilu Hospital of Shandong University (16 patients), and Zhongnan Hospital of Wuhan University (three patients). The patients had all received TMFP after completing standard nCRT. The variables studied included (1) clinicopathological characteristics; (2) clinical complete remission (cCR) and efficacy of TMFP in determining pCR after NCRT in LARC patients; and (3) hospital attended, sex, age, clinical T- and N-stages, distance between the lower margin of the tumor and the anal verge, baseline and post-radiotherapy serum carcinoembryonic antigen (CEA) and carbohydrate antigen (CA)19-9 concentrations, chemotherapy regimen, use of immunosuppressants with or without radiotherapy, radiation therapy dosage, interval between surgery and radiotherapy, surgical procedure, clinical T/N stage after radiotherapy, cCR, pathological results of TMFP, puncture method (endoscopic or percutaneous), and number and timing of punctures. Single-factor and multifactorial logistic regression analysis were used to determine the factors affecting pCR after NCRT in LARC patients. A prediction model was constructed based on the results of multivariat analysis and the performance of this model evaluated by analyzing subject work characteristics (ROC), calibration, and clinical decision-making (DCA) curves. pCR was defined as complete absence of tumor cells on microscopic examination of the surgical specimens of rectal cancer (including lymph node dissection) after NCRT, that is, ypT0+N0. cCR was defined according to the Chinese Neoadjuvant Rectal Cancer Waiting Watch Database Study Collaborative Group criteria after treatment, which specify an absence of ulceration and nodules on endoscopy; negative rectal palpation; no tumor signals on rectal MRI T2 and DWI sequences; normal serum CEA concentrations, and no evidence of recurrence on pelvic computed tomography/magnetic resonance imaging. Results: Of the 110 patients, 45 (40.9%) achieved pCR after nCRT, which was combined with immune checkpoint inhibitors in 34 (30.9%). cCR was diagnosed before puncture in 38 (34.5%) patients, 43 (39.1%) of the punctures being endoscopic. There were no complications of puncture such as enterocutaneous fistulae, vaginal injury, prostatic injury, or presacral bleeding . Only one (2.3%) patient had a small amount of blood in the stools, which was relieved by anal pressure. cCR had a sensitivity of 57.8% (26/45) for determining pCR, specificity of 81.5% (53/65), accuracy of 71.8% (79/110), positive predictive value 68.4% (26/38), and negative predictive value of 73.6% (53/72). In contrast, the sensitivity of TMFP pathology in determining pCR was 100% (45/45), specificity 66.2% (43/65), accuracy 80.0% (88/110), positive predictive value 67.2% (45/67), and negative predictive value 100.0% (43/43). In this study, the sensitivity of TMFP for pCR (100.0% vs. 57.8%, χ2=24.09, P<0.001) was significantly higher than that for cCR. However, the accuracy of pCR did not differ significantly (80.0% vs. 71.8%, χ2=2.01, P=0.156). Univariate and multivariate logistic regression analyses showed that a ≥4 cm distance between the lower edge of the tumor and the anal verge (OR=7.84, 95%CI: 1.48-41.45, P=0.015), non-cCR (OR=4.81, 95%CI: 1.39-16.69, P=0.013), and pathological diagnosis by TMFP (OR=114.29, the 95%CI: 11.07-1180.28, P<0.001) were risk factors for pCR after NCRT in LARC patients. Additionally, endoscopic puncture (OR=0.02, 95%CI: 0.05-0.77, P=0.020) was a protective factor for pCR after NCRT in LARC patients. The area under the ROC curve of the established prediction model was 0.934 (95%CI: 0.892-0.977), suggesting that the model has good discrimination. The calibration curve was relatively close to the ideal 45° reference line, indicating that the predicted values of the model were in good agreement with the actual values. A decision-making curve showed that the model had a good net clinical benefit. Conclusion: Our predictive model, which incorporates TMFP, has considerable accuracy in predicting pCR after nCRT in patients with locally advanced rectal cancer. This may provide a basis for more precisely selecting individualized therapy.
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Affiliation(s)
- Y Jin
- Department of General Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China
| | - Z W Zhai
- Department of General Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China
| | - L T Sun
- Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - P D Xia
- Department of General Surgery, Qilu Hospital of Shandong University, Jinan 250012, China
| | - H Hu
- Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - C Q Jiang
- Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - B C Zhao
- Department of General Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China
| | - H Qu
- Department of General Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China
| | - Q Qian
- Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - Y Dai
- Department of General Surgery, Qilu Hospital of Shandong University, Jinan 250012, China
| | - H W Yao
- Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - Z J Wang
- Department of General Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China
| | - J G Han
- Department of General Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China
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Zhou Y, Zhai YJ, Jin QY, Liu YG, Li LB, Zhang P, Zhang S, Zhao HW, Sun LT. A compact radio-frequency ion source for high brightness and low energy spread negative oxygen ion beam production. Rev Sci Instrum 2023; 94:093301. [PMID: 37655989 DOI: 10.1063/5.0164485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 08/15/2023] [Indexed: 09/02/2023]
Abstract
A high brightness and low energy spread (∆E) ion source is essential to the production of a high-quality primary ion beam applied in secondary ion mass spectrometry (SIMS). A compact 13.56 MHz radio-frequency (RF) ion source with an external planar spiral antenna has been developed as a candidate ion source for the production of negative oxygen ion beams for SIMS application. This ion source is designed with a three-and-a-half-turn water-cooled planar antenna for RF power coupling, a multi-cusp magnetic field for effective plasma confinement, and a three-electrode extraction system. The experimental results show that more than 50 µA negative oxygen ion beams have been extracted, which consist of 56% O-, 25% O2-, and 19% O3-. The ion energy distribution of the negative oxygen ion beam exhibits a Gaussian distribution with a minimum ∆E of 6.3 eV. The brightness of the O- beam is estimated to be 82.4 A m-2 Sr-1 V-1. The simulation, design, and experimental study results of this RF ion source will be presented in this paper.
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Affiliation(s)
- Y Zhou
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Y J Zhai
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Q Y Jin
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Y G Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - L B Li
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - P Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - S Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
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Han JG, Sun LT, Zhai ZW, Xia PD, Hu H, Zhang D, Jiang CQ, Zhao BC, Qu H, Qian Q, Dai Y, Yao HW, Wang ZJ. [The value of transanal multipoint full-layer puncture biopsy in determining the response degree of rectal cancer following neoadjuvant therapy: a prospective multicenter study]. Zhonghua Wai Ke Za Zhi 2023; 61:768-774. [PMID: 37491169 DOI: 10.3760/cma.j.cn112139-20230417-00170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 07/27/2023]
Abstract
Objective: To verify the feasibility and accuracy of the transanal multipoint full-layer puncture biopsy (TMFP) technique in determining the residual status of cancer foci after neoadjuvant therapy (nCRT) in rectal cancer. Methods: Between April 2020 and November 2022, a total of 78 patients from the Beijing Chaoyang Hospital of Capital Medical University, the Beijing Friendship Hospital of Capital Medical University, the Qilu Hospital of Shandong University, the Zhongnan Hospital of Wuhan University with advanced rectal cancer received TMFP after nCRT participated in this prospective multicenter trial. There were 53 males and 25 females, aged (M(IQR)) 61 (13) years (range: 35 to 77 years). The tumor distance from the anal verge was 5 (3) cm (range: 2 to 10 cm). The waiting time between nCRT and TMFP was 73 (26) days (range: 33 to 330 days). 13-point transanal puncture was performed with a 16 G tissue biopsy needle with the residual lesion as the center. The specimens were submitted for independent examination and the complications of the puncture were recorded. The consistency of TMFP and radical operation specimen was compared. The consistency of TMPF with clinical remission rates for the diagnosis of complete pathological remission was compared by sensitivity, specificity, negative predictive value, positive predictive value and accuracy. Statistical analysis between groups was performed using the χ2 analysis, and a paired χ2 test was used to compare diagnostic validity. Results: Before TMFP, clinical complete response (cCR) was evaluated in 27 cases. Thirty-six cases received in vivo puncture, the number of punctures in each patient was 13 (8) (range: 4 to 20), 24 cases of tumor residue were found in the puncture specimens. The sensitivity to judgment (100% vs. 60%, χ2=17.500, P<0.01) and accuracy (88.5% vs. 74.4%, χ2=5.125, P=0.024) of TMFP for the pathologic complete response (pCR) were significantly higher than those of cCR. Implement TMFP based on cCR judgment, the accuracy increased from 74.4% to 92.6% (χ2=4.026, P=0.045). The accuracy of the in vivo puncture was 94.4%, which was 83.3% of the in vitro puncture (χ2=1.382, P=0.240). Overall, the accuracy of TMFP improved gradually with an increasing number of cases (χ2=7.112, P=0.029). Conclusion: TMFP is safe and feasible, which improves the sensitivity and accuracy of rectal cancer pCR determination after nCRT, provides a pathological basis for cCR determination, and contributes to the safe development of the watch and wait policy.
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Affiliation(s)
- J G Han
- Department of General Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China
| | - L T Sun
- Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - Z W Zhai
- Department of General Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China
| | - P D Xia
- Department of General Surgery, Qilu Hospital of Shandong University, Jinan 250012, China
| | - H Hu
- Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - D Zhang
- Department of Clinical Epidemiology Laboratory, Beijing Institute of Respiratory Medicine, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China
| | - C Q Jiang
- Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - B C Zhao
- Department of General Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China
| | - H Qu
- Department of General Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China
| | - Q Qian
- Department of General Surgery, Zhongnan Hospital of Wuhan University, Wuhan 430071, China
| | - Y Dai
- Department of General Surgery, Qilu Hospital of Shandong University, Jinan 250012, China
| | - H W Yao
- Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - Z J Wang
- Department of General Surgery, Beijing Chaoyang Hospital, Capital Medical University, Beijing 100020, China
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Wang LH, Su J, Shen YP, He JJ, Lugaro M, Szányi B, Karakas AI, Zhang LY, Li XY, Guo B, Lian G, Li ZH, Wang YB, Chen LH, Cui BQ, Tang XD, Gao BS, Wu Q, Sun LT, Wang S, Sheng YD, Chen YJ, Zhang H, Li ZM, Song LY, Jiang XZ, Nan W, Nan WK, Zhang L, Cao FQ, Jiao TY, Ru LH, Cheng JP, Wiescher M, Liu WP. Measurement of the ^{18}O(α, γ)^{22}Ne Reaction Rate at JUNA and Its Impact on Probing the Origin of SiC Grains. Phys Rev Lett 2023; 130:092701. [PMID: 36930937 DOI: 10.1103/physrevlett.130.092701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 09/22/2022] [Accepted: 01/13/2023] [Indexed: 06/18/2023]
Abstract
The ^{18}O(α,γ)^{22}Ne reaction is critical for AGB star nucleosynthesis due to its connection to the abundances of several key isotopes, such as ^{21}Ne and ^{22}Ne. However, the ambiguous resonance energy and spin-parity of the dominant 470 keV resonance leads to substantial uncertainty in the ^{18}O(α,γ)^{22}Ne reaction rate for the temperature of interest. We have measured the resonance energies and strengths of the low-energy resonances in ^{18}O(α,γ)^{22}Ne at the Jinping Underground Nuclear Astrophysics experimental facility (JUNA) with improved precision. The key 470 keV resonance energy has been measured to be E_{α}=474.0±1.1 keV, with such high precision achieved for the first time. The spin-parity of this resonance state is determined to be 1^{-}, removing discrepancies in the resonance strengths in earlier studies. The results significantly improve the precision of the ^{18}O(α,γ)^{22}Ne reaction rates by up to about 10 times compared with the previous data at typical AGB temperatures of 0.1-0.3 GK. We demonstrate that such improvement leads to precise ^{21}Ne abundance predictions, with an impact on probing the origin of meteoritic stardust SiC grains from AGB stars.
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Affiliation(s)
- L H Wang
- Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - J Su
- Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - Y P Shen
- China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China
| | - J J He
- Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - M Lugaro
- Konkoly Observatory, Research Centre for Astronomy and Earth Sciences (CSFK), Eötvös Loránd Research Network (ELKH), Konkoly Thege Miklós út 15-17, 1121 Budapest, Hungary
- CSFK, MTA Centre of Excellence, Budapest, Konkoly Thege Miklós út 15-17, H-1121, Hungary
- ELTE Eötvös Loránd University, Institute of Physics, Budapest 1117, Pázmány Péter sétány 1/A, Hungary
- School of Physics and Astronomy, Monash University, Victoria 3800, Australia
| | - B Szányi
- Konkoly Observatory, Research Centre for Astronomy and Earth Sciences (CSFK), Eötvös Loránd Research Network (ELKH), Konkoly Thege Miklós út 15-17, 1121 Budapest, Hungary
- CSFK, MTA Centre of Excellence, Budapest, Konkoly Thege Miklós út 15-17, H-1121, Hungary
- Graduate School of Physics, University of Szeged, Dom tér 9, Szeged, 6720 Hungary
| | - A I Karakas
- School of Physics and Astronomy, Monash University, Victoria 3800, Australia
- ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Australia
| | - L Y Zhang
- Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - X Y Li
- Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - B Guo
- China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China
| | - G Lian
- China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China
| | - Z H Li
- China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China
| | - Y B Wang
- China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China
| | - L H Chen
- China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China
| | - B Q Cui
- China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China
| | - X D Tang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - B S Gao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Q Wu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - S Wang
- Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, China
| | - Y D Sheng
- Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - Y J Chen
- Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - H Zhang
- Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - Z M Li
- Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - L Y Song
- Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - X Z Jiang
- Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - W Nan
- China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China
| | - W K Nan
- China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China
| | - L Zhang
- China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China
| | - F Q Cao
- China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China
| | - T Y Jiao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - L H Ru
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - J P Cheng
- Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - M Wiescher
- Department of Physics and The Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556-5670, USA
- Wolfson Fellow of Royal Society, School of Physics and Astronomy, University of Edinburgh, King's Buildings, Edinburgh EH9 3FD, United Kingdom
| | - W P Liu
- China Institute of Atomic Energy, P. O. Box 275(10), Beijing 102413, China
- College of Science, Southern University of Science and Technology, Shenzhen 518055, China
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Liu YG, Huang W, Wu Q, Liu JL, Zhang X, Zhou Y, Zhai YJ, Sun LT. Simulation of beam extraction and space charge effect in an electromagnetic isotope separator. Appl Radiat Isot 2022; 189:110448. [PMID: 36108533 DOI: 10.1016/j.apradiso.2022.110448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 08/23/2022] [Accepted: 08/29/2022] [Indexed: 11/26/2022]
Abstract
Space charge effect of intense ion beam has critical influence on separation efficiency in the electromagnetic isotope separator. In this paper, a ribbon beam extraction system with slit electrodes for an electromagnetic isotope separator was designed and studied. The extracted beam currents were varied from 10 to 40 mA and the corresponding extracted beam energies were 40 keV and 100 keV respectively. The simulated output beam density distributions were used in the subsequent multi species particle transmission simulation with the space charge effect included. The separated isotope beam spot distributions at the focal plane were simulated under different space charge compensation factors and thus the optimum operation gas pressures in vacuum box were roughly estimated. For the case of high intensity and high power isotope beam collection, an isotope collector with a deceleration electrode was proposed to mitigate the effect of high power beam bombardment and the resultant temperature rising on the collector surface.
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Affiliation(s)
- Y G Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - W Huang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Q Wu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - J L Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
| | - X Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Y Zhou
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Y J Zhai
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing, 100049, China.
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Gao B, Jiao TY, Li YT, Chen H, Lin WP, An Z, Ru LH, Zhang ZC, Tang XD, Wang XY, Zhang NT, Fang X, Xie DH, Fan YH, Ma L, Zhang X, Bai F, Wang P, Fan YX, Liu G, Huang HX, Wu Q, Zhu YB, Chai JL, Li JQ, Sun LT, Wang S, Cai JW, Li YZ, Su J, Zhang H, Li ZH, Li YJ, Li ET, Chen C, Shen YP, Lian G, Guo B, Li XY, Zhang LY, He JJ, Sheng YD, Chen YJ, Wang LH, Zhang L, Cao FQ, Nan W, Nan WK, Li GX, Song N, Cui BQ, Chen LH, Ma RG, Zhang ZC, Yan SQ, Liao JH, Wang YB, Zeng S, Nan D, Fan QW, Qi NC, Sun WL, Guo XY, Zhang P, Chen YH, Zhou Y, Zhou JF, He JR, Shang CS, Li MC, Kubono S, Liu WP, deBoer RJ, Wiescher M, Pignatari M. Deep Underground Laboratory Measurement of ^{13}C(α,n)^{16}O in the Gamow Windows of the s and i Processes. Phys Rev Lett 2022; 129:132701. [PMID: 36206440 DOI: 10.1103/physrevlett.129.132701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 04/01/2022] [Accepted: 06/01/2022] [Indexed: 06/16/2023]
Abstract
The ^{13}C(α,n)^{16}O reaction is the main neutron source for the slow-neutron-capture process in asymptotic giant branch stars and for the intermediate process. Direct measurements at astrophysical energies in above-ground laboratories are hindered by the extremely small cross sections and vast cosmic-ray-induced background. We performed the first consistent direct measurement in the range of E_{c.m.}=0.24 to 1.9 MeV using the accelerators at the China Jinping Underground Laboratory and Sichuan University. Our measurement covers almost the entire intermediate process Gamow window in which the large uncertainty of the previous experiments has been reduced from 60% down to 15%, eliminates the large systematic uncertainty in the extrapolation arising from the inconsistency of existing datasets, and provides a more reliable reaction rate for the studies of the slow-neutron-capture and intermediate processes along with the first direct determination of the alpha strength for the near-threshold state.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - R J deBoer
- Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
| | - M Wiescher
- Center for Nuclear Study, University of Tokyo, Wako, Saitama 351-0198, Japan
- Wolfson Fellow of Royal Society, School of Physics and Astronomy, University of Edinburgh, King's Buildings, Edinburgh EH9 3FD, United Kingdom
| | - M Pignatari
- Konkoly Observatory, Research Centre for Astronomy and Earth Sciences (CSFK), Eötvös Loránd Research Network (ELKH), Konkoly Thege Miklós út 15-17, H-1121 Budapest, Hungary
- CSFK, MTA Centre of Excellence, Budapest, Konkoly Thege Miklós út 15-17, Budapest H-1121, Hungary
- E. A. Milne Centre for Astrophysics, Department of Physics and Mathematics, University of Hull, Hull, HU6 7RX, United Kingdom
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Zhao YM, Liu CL, Li YL, Jia J, Wu XN, Li SN, Sun LT, Nie L. [Characteristics of heart rate variability in patients with vestibular migraine]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2022; 57:584-588. [PMID: 35610677 DOI: 10.3760/cma.j.cn15330-20210805-00524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Objective: To analyze the characteristics of heart rate variability (HRV) in patients with vestibular migraine (VM) and to explore its possible mechanism. Methods: Forty-eight patients with VM [17 males and 31 females, age (36.2±9.2) years], 44 patients with migraine [15 males and 29 females, age (34.4±9.0) years], and 30 patients with health check-ups during the same period [12 males and 18 females, age (34.6±6.5) years old] were selected as study subjects. Ambulatory ECG monitoring was performed in all subjects, and the HRV characteristics of each group were analyzed from both daytime and nighttime time phases. Time domain parameters were analyzed: standard deviation of normal to normal (SDNN), root mean square of successive differences (RMSSD), and percentage of normal to normal intervals differing by more than 50 ms (pNN50). The parameters in the frequency domain were analyzed: high frequency power (HF), low frequency power (LF), and the ratio of low frequency to high frequency power (LF/HF). Statistical analysis of the data was performed using SPSS 26.0 software. Results: At night, RMSSD (F=6.694) and HF (F=9.434) were lower in the VM and migraine groups compared to the control group, while LF/HF (F=16.049) and LF (F=9.434) were elevated compared to the control group, with statistically significant differences (P<0.05 or P<0.01), while LF was significantly elevated in the VM group compared to the migraine group, with a statistically significant (P<0.05). On the daytime measurements, mainly LF was elevated in the vestibular migraine group compared with the control group, while RMSSD was decreased compared with the control group, with statistically significant differences (P<0.05). Conclusion: Autonomic dysfunction characterized by sympathetic hyperfunction and vagal hypofunction is present in VM patients and is more pronounced at night. In addition, the degree of autonomic dysfunction may be more pronounced in VM patients than in migraine patients.
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Affiliation(s)
- Y M Zhao
- Department of Neurology, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou 450014, China
| | - C L Liu
- Department of Neurology, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou 450014, China
| | - Y L Li
- Department of Neurology, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou 450014, China
| | - J Jia
- Department of Neurology, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou 450014, China
| | - X N Wu
- Department of Neurology, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou 450014, China
| | - S N Li
- Department of Neurology, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou 450014, China
| | - L T Sun
- Department of Neurology, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou 450014, China
| | - Liantao Nie
- Department of Electrocardiogram, the Second Affiliated Hospital of Zhengzhou University, Zhengzhou 450014, China
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8
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Ding YQ, Fan K, Wang Y, Fang WP, Zhu XJ, Chen L, Sun LT, Qiu C, Ding ZT. [Drought and Heat Stress-Mediated Modulation of Alternative Splicing in the Genes Involved in Biosynthesis of Metabolites Related to Tea Quality]. Mol Biol (Mosk) 2022; 56:321-322. [PMID: 35403623 DOI: 10.31857/s0026898422020057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Accepted: 07/31/2021] [Indexed: 06/14/2023]
Abstract
Alternative splicing (AS) regulates mRNAs at the post-transcriptional level to affect both their amounts and the protein function. However, little is known about the roles of AS in regulation of biosynthesis of amino acids, flavonoids, and volatile compounds in tea plants. In this study, we used Iso-seq and transcriptome deep sequencing (RNA-seq) to identify AS events, and analyzed the expression of respective mRNAs in tea plants under drought (DS), heat stress (HS), and their combination (HD). By RT-PCR, we validated the AS events in nine genes involved in the biosynthesis of amino acids and flavonoids. The genes accumulating AS transcripts under DS, HS, and HD conditions included those encoding for anthocyanidin reductase (ANR), dihydrofavonol-4-reductase-like (DFRA), and chalcone isomerase (CHI). Similarly, genes directly or indirectly involved in the biosynthesis of volatile compounds such as lipoxygenase (LOX), terpenoid/terpene synthase (TPS), and 1-deoxy-D-xylulose 5-phosphate reductoisomerase (DXR) also had AS events. Our study revealed that AS might specifically regulate the biosynthesis of amino acids in tea plants under stressful conditions. Moreover, we suggest that the AS events within the ANR and DFRA transcripts might play an important role in the regulation of flavonoid biosynthesis under DS, HS, and HD conditions. This study improved our understanding of the genetic drivers of the changes in the content of bioactive ingredients of tea plants subjected to abiotic stresses.
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Affiliation(s)
- Y Q Ding
- Tea Research Institute, Shandong Academy of Agricultural Sciences, Rizhao, 276800 China
| | - K Fan
- Tea Research Institute, Shandong Academy of Agricultural Sciences, Rizhao, 276800 China
| | - Y Wang
- Tea Research Institute, Shandong Academy of Agricultural Sciences, Rizhao, 276800 China
| | - W P Fang
- College of Horticulture, Nanjing Agricultural University, Nanjing, 210095 China
| | - X J Zhu
- College of Horticulture, Nanjing Agricultural University, Nanjing, 210095 China
| | - L Chen
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, 310008 China
| | - L T Sun
- Tea Research Institute, Shandong Academy of Agricultural Sciences, Rizhao, 276800 China
| | - C Qiu
- Tea Research Institute, Shandong Academy of Agricultural Sciences, Rizhao, 276800 China
| | - Z T Ding
- Tea Research Institute, Shandong Academy of Agricultural Sciences, Rizhao, 276800 China
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9
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Ding YQ, Fan K, Wang Y, Fang WP, Zhu XJ, Chen L, Sun LT, Qiu C, Ding ZT. Drought and Heat Stress-Mediated Modulation of Alternative Splicing in the Genes Involved in Biosynthesis of Metabolites Related to Tea Quality. Mol Biol 2022. [DOI: 10.1134/s0026893322020042] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Zhang LY, Su J, He JJ, Wiescher M, deBoer RJ, Kahl D, Chen YJ, Li XY, Wang JG, Zhang L, Cao FQ, Zhang H, Zhang ZC, Jiao TY, Sheng YD, Wang LH, Song LY, Jiang XZ, Li ZM, Li ET, Wang S, Lian G, Li ZH, Tang XD, Zhao HW, Sun LT, Wu Q, Li JQ, Cui BQ, Chen LH, Ma RG, Guo B, Xu SW, Li JY, Qi NC, Sun WL, Guo XY, Zhang P, Chen YH, Zhou Y, Zhou JF, He JR, Shang CS, Li MC, Zhou XH, Zhang YH, Zhang FS, Hu ZG, Xu HS, Chen JP, Liu WP. Direct Measurement of the Astrophysical ^{19}F(p,αγ)^{16}O Reaction in the Deepest Operational Underground Laboratory. Phys Rev Lett 2021; 127:152702. [PMID: 34678013 DOI: 10.1103/physrevlett.127.152702] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 08/01/2021] [Accepted: 08/24/2021] [Indexed: 06/13/2023]
Abstract
Fluorine is one of the most interesting elements in nuclear astrophysics, where the ^{19}F(p,α)^{16}O reaction is of crucial importance for Galactic ^{19}F abundances and CNO cycle loss in first generation Population III stars. As a day-one campaign at the Jinping Underground Nuclear Astrophysics experimental facility, we report direct measurements of the essential ^{19}F(p,αγ)^{16}O reaction channel. The γ-ray yields were measured over E_{c.m.}=72.4-344 keV, covering the Gamow window; our energy of 72.4 keV is unprecedentedly low, reported here for the first time. The experiment was performed under the extremely low cosmic-ray-induced background environment of the China JinPing Underground Laboratory, one of the deepest underground laboratories in the world. The present low-energy S factors deviate significantly from previous theoretical predictions, and the uncertainties are significantly reduced. The thermonuclear ^{19}F(p,αγ)^{16}O reaction rate has been determined directly at the relevant astrophysical energies.
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Affiliation(s)
- L Y Zhang
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - J Su
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - J J He
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - M Wiescher
- Department of Physics and The Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - R J deBoer
- Department of Physics and The Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - D Kahl
- Extreme Light Infrastructure-Nuclear Physics, Horia Hulubei National Institute for Research and Development in Physics and Nuclear Engineering (IFIN-HH), Bucharest-Măgurele 077125, Romania
| | - Y J Chen
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - X Y Li
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - J G Wang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - L Zhang
- China Institute of Atomic Energy, Beijing 102413, China
| | - F Q Cao
- China Institute of Atomic Energy, Beijing 102413, China
| | - H Zhang
- China Institute of Atomic Energy, Beijing 102413, China
| | - Z C Zhang
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - T Y Jiao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Y D Sheng
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - L H Wang
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - L Y Song
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - X Z Jiang
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - Z M Li
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - E T Li
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - S Wang
- Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, China
| | - G Lian
- China Institute of Atomic Energy, Beijing 102413, China
| | - Z H Li
- China Institute of Atomic Energy, Beijing 102413, China
| | - X D Tang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Q Wu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - J Q Li
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - B Q Cui
- China Institute of Atomic Energy, Beijing 102413, China
| | - L H Chen
- China Institute of Atomic Energy, Beijing 102413, China
| | - R G Ma
- China Institute of Atomic Energy, Beijing 102413, China
| | - B Guo
- China Institute of Atomic Energy, Beijing 102413, China
| | - S W Xu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - J Y Li
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - N C Qi
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - W L Sun
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - X Y Guo
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - P Zhang
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - Y H Chen
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - Y Zhou
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - J F Zhou
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - J R He
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - C S Shang
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - M C Li
- Yalong River Hydropower Development Company, Chengdu 610051, China
| | - X H Zhou
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Y H Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - F S Zhang
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - Z G Hu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - H S Xu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - J P Chen
- Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
| | - W P Liu
- China Institute of Atomic Energy, Beijing 102413, China
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11
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Lu W, Qian C, Zhang WH, Ma HY, Ma JD, Feng YC, Li LB, Li LX, Guo JW, Huang W, Zhang XZ, Sun LT, Zhao HW. Production of metallic ion beams by electron cyclotron resonance ion sources equipped with inductive heating ovens at the Institute of Modern Physics. Rev Sci Instrum 2021; 92:033302. [PMID: 33820031 DOI: 10.1063/5.0041671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Accepted: 02/17/2021] [Indexed: 06/12/2023]
Abstract
A high-temperature oven based on the inductive heating technology was developed successfully at the Institute of Modern Physics in 2019. This oven features a durable operation temperature of over 2000 °C inside the tantalum susceptor. By carefully designing the oven structure, the material compatibility issue at high temperature has been successfully solved, which enables the production and routine operation of refractory metal ions with SECRAL-II (Superconducting Electron Cyclotron Resonance ion source with Advanced design in Lanzhou No. 2). To further apply this type of oven to the room temperature ECR ion sources LECR4 and LECR5 (Lanzhou Electron Cyclotron Resonance ion source No. 4 and 5), a mini-inductive heating oven has been fabricated and tested in 2020. By directly evaporating calcium oxide, some high charge state calcium beams have been produced successfully, such as 52 euA of 40Ca16+, 30 euA of 40Ca17+, and 12 euA of 40Ca18+. The detailed design and testing results will be presented and discussed.
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Affiliation(s)
- W Lu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - C Qian
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - W H Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - H Y Ma
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - J D Ma
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - Y C Feng
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - L B Li
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - L X Li
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - J W Guo
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - W Huang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - X Z Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
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12
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Li JB, Li LX, Li LB, Guo JW, Hitz D, Lu W, Feng YC, Zhang WH, Zhang XZ, Zhao HY, Sun LT, Zhao HW. Influence of electron cyclotron resonance ion source parameters on high energy electrons. Rev Sci Instrum 2020; 91:083302. [PMID: 32872961 DOI: 10.1063/5.0011403] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 07/25/2020] [Indexed: 06/11/2023]
Abstract
In order to diagnose the electron cyclotron resonance (ECR) plasma, a high-efficiency collimation system has been developed at the Institute of Modern Physics, and the bremsstrahlung spectra in the range of 10 keV-300 keV were measured on a third generation superconducting ECR ion source, SECRAL-II, with a CdTe detector. Used as a comparative index of the mean energy of the high energy electron population, the spectral temperature, Ts, is derived through a linear fitting of the spectra in a semi-logarithmic representation. The influences of some main source parameters, such as the neutral gas pressure, extraction voltage, microwave power, and bias disk voltage, on the high energy electrons are systemically investigated.
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Affiliation(s)
- J B Li
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - L X Li
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - L B Li
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - J W Guo
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - D Hitz
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - W Lu
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - Y C Feng
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - W H Zhang
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - X Z Zhang
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - H Y Zhao
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, China
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13
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Jia ZH, Tong AL, Sun LT, Liu YG, Liu JL, Wu Q, Fang X, Yang WS, Guo YH, Ritterbusch F, Lu ZT, Jiang W, Yang GM, Chen QW. An electromagnetic separation system for the enrichment of 39Ar. Rev Sci Instrum 2020; 91:033309. [PMID: 32259973 DOI: 10.1063/1.5128697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Accepted: 02/18/2020] [Indexed: 06/11/2023]
Abstract
An isotope enrichment system for 39Ar has been developed at the Institute of Modern Physics, which is designed to increase the abundance of 39Ar in the incident sample gas. With intense Ar+ beams produced by a 2.45 GHz electron cyclotron resonance ion source and a high mass resolution spectrometer system, Ar isotopes are evidently separated on the target plane and selectively collected by an Al target. The separated Ar isotopes have been identified on the target plane, which is consistent with the simulations. According to the recent cross-checked results with atom trap trace analysis, a high enrichment factor of 39Ar has been successfully achieved. This paper will present the design and test results of this system.
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Affiliation(s)
- Z H Jia
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Amin L Tong
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Y G Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - J L Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Q Wu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - X Fang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - W S Yang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Y H Guo
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - F Ritterbusch
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Z-T Lu
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - W Jiang
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - G M Yang
- Hefei National Laboratory for Physical Sciences at the Microscale, CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China
| | - Q W Chen
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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14
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Liu YG, Liu JL, Wu Q, Sun LT. Ion beam production with an antenna type 2.45 GHz electron cyclotron resonance ion source. Rev Sci Instrum 2020; 91:023301. [PMID: 32113396 DOI: 10.1063/1.5128393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 01/12/2020] [Indexed: 06/10/2023]
Abstract
A very compact permanent magnet 2.45 GHz electron cyclotron resonance ion source has been designed and developed for various purposes. The microwave power is coupled into the plasma chamber using the coaxial antenna instead of the waveguide, the magnetic field is produced by two NdFeB permanent magnet rings, and the diameter of the source body is only 10 cm. The beam current under different conditions was measured. A maximum of 5.8 mA H+/H2 +/H3 + mixed beam could be extracted from a 5.5 mm diameter extraction aperture.
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Affiliation(s)
- Y G Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - J L Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Q Wu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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15
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Qian C, Sun LT, Jia ZH, Li LB, Ma YM, Fang X, Guo JW, Wang H, Lu W, Zhang XZ, Zhao HW. A new room temperature LECR5 ion source for the SESRI project. Rev Sci Instrum 2020; 91:023313. [PMID: 32113446 DOI: 10.1063/1.5128514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 01/23/2020] [Indexed: 06/10/2023]
Abstract
The Space Environment Simulation and Research Infrastructure project, which uses various ion beams as irradiated materials in life science research, is being built at the Harbin Institute of Technology. A new room temperature electron cyclotron resonance ion source, the Lanzhou Electron Cyclotron Resonance Ion Source No. 5 (LECR5), has been designed and constructed. It is an intense, highly charged, heavy ion beam injector which generates ion beams from H to Bi, typically ∼50 eμA 209Bi32+. The LECR5 is designed to operate at microwave frequencies in the range of 14.5-18 GHz. The typical magnetic parameters are designed based on those optimized for SECRAL, which operates at 18 GHz. This paper presents the LECR5 ion source, its test bench, and the preliminary beam results.
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Affiliation(s)
- C Qian
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Z H Jia
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - L B Li
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Y M Ma
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - X Fang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - J W Guo
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - H Wang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - W Lu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - X Z Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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16
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Fang X, Sun LT, Yuan YJ, Qian C, Yang Y, Lu W, Zhao HW. Emittance study of the high intensity highly charged heavy ion beams extracted from electron cyclotron resonance ion source. Rev Sci Instrum 2020; 91:013317. [PMID: 32012582 DOI: 10.1063/1.5128638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Accepted: 12/26/2019] [Indexed: 06/10/2023]
Abstract
According to the requirements of ion beams extracted from an electron cyclotron resonance ion source transverse phase space coupling research and the afterglow beam property effective measurement, a pepper pot type meter called PEMiL (Pepper Pot Emittance Meter in Lanzhou) has been designed, fabricated, and commissioned to obtain the emittance of high intensity highly charged heavy ion beams. The direct current beam emittance measurement results verify the coupling property caused by the semisolenoid field. This paper also describes the scheme of multiple exposure accumulation which was applied to measure the afterglow beam property, and the transverse phase space distribution of the oxygen afterglow beam which was measured for the first time is presented.
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Affiliation(s)
- X Fang
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - Y J Yuan
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - C Qian
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - Y Yang
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - W Lu
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics, CAS, Lanzhou 730000, China
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17
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Li JQ, Cao Y, Sun LT, Zhang XZ, Guo JW, Fang X, Wang H, Zhao HW. Intense carbon beams production with an all permanent magnet electron cyclotron resonance ion source for heavy ion medical machine. Rev Sci Instrum 2020; 91:013307. [PMID: 32012517 DOI: 10.1063/1.5128488] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 12/20/2019] [Indexed: 06/10/2023]
Abstract
LAPECR3 (Lanzhou All Permanent magnet Electron cyclotron Resonance ion source No. 3) had been developed as an ion injector of Heavy Ion Medical Machine (HIMM) accelerator facility since 2009. The first HIMM accelerator facility was built in Wuwei city in 2015, and the LAPCER3 ion source has delivered C5+ ion beam to HIMM for more than 1000 days in the past four years. In order to improve the performance of the LAPECR3 ion source for intense carbon beams production, continuous research and development work has been made. The recently developed LAPECR3 ion source together with the new low-energy beam transportation can provide better performance in terms of both beam intensity and quality. This paper will generally review the LAPECR3 ion source operation status for HIMM, and the recent improvement will be presented, especially the stable beams production of C4+ and C5+.
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Affiliation(s)
- J Q Li
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Y Cao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - X Z Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - J W Guo
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - X Fang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - H Wang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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18
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Huang W, Xie DZ, Sun LT. Development of a new high temperature oven for the production of intense metal ion beams with ECR ion sources. Rev Sci Instrum 2019; 90:123301. [PMID: 31893832 DOI: 10.1063/1.5127518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Accepted: 11/13/2019] [Indexed: 06/10/2023]
Abstract
High Temperature Ovens (HTOs) have widely been used to evaporate refractory materials in electron cyclotron resonance ion sources to produce hundreds of microamperes of multiply and highly charged metal ion beams. To meet the demands of milliamperes of multiply charged uranium and other heavy metal ion beams for future accelerators, a new and low-cost HTO is under development at Lawrence Berkeley National Laboratory for better long-term stability at high evaporation rates. ANSYS simulations have been carried out to optimize the new HTO with low heating current to reduce the electromagnetic forces as an HTO is immersed in the strong ECRIS magnetic fields. A larger loading volume is employed to deal with higher material consumption. Off-line tests have shown that the unloaded new HTO operates stably up to 1800-1900 °C with low temperature gradients and good repeatability. This paper presents and discusses the conceptual design features of the new HTO and off-line tests.
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Affiliation(s)
- W Huang
- Nuclear Science Division, Lawrence Berkeley Laboratory, Berkeley, California 94720, USA
| | - D Z Xie
- Nuclear Science Division, Lawrence Berkeley Laboratory, Berkeley, California 94720, USA
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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19
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Zhang JJ, Zhao HY, Wang GC, Sun LT, Zhang XZ, Li GP, Zhao HW. Ion charge state and energy distributions of laser produced plasma from pure metals and their alloy. Rev Sci Instrum 2019; 90:123306. [PMID: 31893843 DOI: 10.1063/1.5130426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Accepted: 11/20/2019] [Indexed: 06/10/2023]
Abstract
A high intensity highly charged laser ion source has been studied at the Institute of Modern Physics for the last few years. In order to investigate the processes of plasma heating and expansion of laser produced plasma, the charge state and energy distributions of the ions from pure copper, silver, and copper-silver alloy, in which the atom number ratio between copper and silver is 2:3, were measured with a 90° cylindrical electrostatic ion analyzer. It was shown that the yields of highly charged copper ions from the pure copper target are higher compared with those of the alloy target. In contrast, higher yields of highly charged silver ions were obtained from the copper-silver alloy target. Moreover, the ion energy distributions were derived from the time-of-flight spectra for the ions with different ion charge states and compared between the pure metal and alloy targets.
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Affiliation(s)
- J J Zhang
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - H Y Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - G C Wang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - X Z Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - G P Li
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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20
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Wang GC, Zhao HY, Jin QY, Zhang JJ, Sun LT, Zhao HW. Laser ablation plasma with solenoid field confinement. Rev Sci Instrum 2019; 90:113302. [PMID: 31779399 DOI: 10.1063/1.5128637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Accepted: 10/10/2019] [Indexed: 06/10/2023]
Abstract
A Laser Ion Source (LIS) can produce high charge state and high intensity ion beams (∼emA), especially, refractory metallic ion beams, which makes it a promising candidate as an ion source for heavy ion cancer therapy facilities and future accelerator complexes, where pulsed high intensity and high charged heavy ion beams are required. However, it is difficult for the LIS to obtain a long pulse width while ensuring high current intensity, thus limiting the application of the LIS. To solve the conflict, magnetic fields are proposed to confine the expansion of the laser produced plasma. With a solenoid along the normal direction to the target surface, the lateral adiabatic expansion of the laser ablation plasma is suppressed which extends the pulse width of the ion beam effectively. The characteristics of laser ablation plasma with solenoid field confinement will be presented and discussed in this paper.
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Affiliation(s)
- G C Wang
- Institute of Modern Physics, Chinese Academy of Sciences, 509 Nanchang Road, Lanzhou 730000, China
| | - H Y Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, 509 Nanchang Road, Lanzhou 730000, China
| | - Q Y Jin
- Institute of Modern Physics, Chinese Academy of Sciences, 509 Nanchang Road, Lanzhou 730000, China
| | - J J Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, 509 Nanchang Road, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, 509 Nanchang Road, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, 509 Nanchang Road, Lanzhou 730000, China
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21
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Jin QY, Zhou Y, Sun LT, Liu YG, Zhang XZ, Zhao HW. Production of O - and O 2 - beams with the negative ion source at Institute of Modern Physics. Rev Sci Instrum 2019; 90:113317. [PMID: 31779421 DOI: 10.1063/1.5128526] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 11/05/2019] [Indexed: 06/10/2023]
Abstract
A negative oxygen ion source is under development to produce O- and O2 - beams used for a secondary ion mass spectrometer at Institute of Modern Physics (IMP), and both filament and radio frequency (RF) schemes are tested. The filament driven ion source, which was initially designed for H- production, has a 10-pole multicusp plasma chamber, two sets of virtual magnetic filters, and a 3-electrode extraction system. The RF scheme, which is improved by changing a RF back plate from the filament ion source, has an external planar spiral RF antenna behind an AlN window. The RF power system consists of a continuous wave (CW) 13.56 MHz/2 kW power supply, a capacitive automatching network and a water-cooled flat RF antenna made from a 6-mm copper tube. Oxygen and carbon dioxide gases are used to produce O- and O2 - ion beams, and ion composition is analyzed by using a Wien filter. However, the lifetime of filaments sustains from several minutes to hours before fracture occurred while the RF one can work stably with no maintenance, and the experiment results will be given on O- ion production with two different technologies using our ion source test facility.
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Affiliation(s)
- Q Y Jin
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Y Zhou
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Y G Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - X Z Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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22
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Lu W, Sun LT, Qian C, Li LB, Guo JW, Huang W, Zhang XZ, Zhao HW. Production of intense uranium beams with inductive heating oven at Institute of Modern Physics. Rev Sci Instrum 2019; 90:113318. [PMID: 31779405 DOI: 10.1063/1.5128419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 10/26/2019] [Indexed: 06/10/2023]
Abstract
HIAF (High Intensity heavy ion Accelerator Facility) is a new accelerator complex under construction at the Institute of Modern Physics. As the main injector of this project, the high-charge-state ECR ion source needs to provide intense uranium beams, such as 700 eμA of U35+. This requires the performance of metal ovens to be further improved so that the crucible can operate at an ultrahigh temperature for a long time without damage in a high magnetic field (>3 T). In order to meet these requirements, an inductive oven with special thermal shielding and support has been developed in the past two years. The off-line test result has shown that this oven can reach up to 2000 °C with ∼1.2 kW of heating power. After ∼5 days of continuous running on the SECRAL-II platform, the tantalum crucible survived. In this contribution, we will discuss the structure of this inductive oven and analyze the test results as well.
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Affiliation(s)
- W Lu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - C Qian
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - L B Li
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - J W Guo
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - W Huang
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - X Z Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
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23
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Liu YY, Zhao YH, Zhou Y, Guo XL, Chen ZT, Zhang WJ, Zhang Y, Chen J, Wang ZM, Sun LT, Zhang T. High-efficient catalytic reduction of 4-nitrophenol based on reusable Ag nanoparticles/graphene-loading loofah sponge hybrid. Nanotechnology 2018; 29:315702. [PMID: 29748455 DOI: 10.1088/1361-6528/aac3e8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Noble metal nanoparticles (NPs) such as Au and Ag have shown many applications in the field of catalysis, sensing etc. due to their excellent photoelectric properties. But agglomeration and a low recovery rate are big problems for their applications. In this research, a novel Ag NPs/graphene (reduced graphene oxide)-loading loofah sponge (Ag NPs/RGO-LS) was synthesized through a one-step reduction method. Where the RGO is used as a nano-support with the high specific surface area and the high conductivity to prevent the agglomeration of Ag NPs and provide a conductive layer. The natural, green, low-cost and high-yield LS is designed as a macro-support to reduce the loss of Ag NPs during recycling. The as-prepared Ag NPs/RGO-LS is stable, uniform, and exhibits high efficiency and reusability in the catalytic reduction of 4-nitrophenol (4-NP) with a high rate constant of 1.893 min-1 as well as an average conversion of 98% in 6 min during five cycles. The results have not only paved the way for the wide application of Ag NPs but also provide a new road for the application of other metal NPs.
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Affiliation(s)
- Y Y Liu
- Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, People's Republic of China
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24
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Liu YY, Guo XL, Zhao L, Zhu L, Chen ZT, Chen J, Zhang Y, Sun LT, Zhao YH. Facile preparation of surfactant-free Au NPs/RGO/Ni foam for degradation of 4-nitrophenol and detection of hydrogen peroxide. Nanotechnology 2018; 29:235706. [PMID: 29570092 DOI: 10.1088/1361-6528/aab936] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The application of Au nanoparticles (Au NPs) often requires surface modification with chemical surfactants, which dramatically reduce the surface activity and increase the chemical contamination and cost of Au NPs. In this research, we have developed a novel Au NPs/reduced graphene oxide/Ni foam hybrid (Au NPs/RGO/NiF) by in situ reduction through ascorbic acid and replacement reaction. This method is green, facile and efficient. The Au NPs are free of chemical surfactants and are homogeneously distributed on the surface of the RGO/NiF. The as-prepared Au NPs/RGO/NiF hybrid is uniform, stable and exhibits not only a high reduction efficiency for the reduction of 4-nitrophenol with a catalytic kinetic constant of up to 0.46 min-1 (0.15 cm3 catalysis) but also a sensitive and selective detection of H2O2 with a detection limit of ∼1.60 μM.
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Affiliation(s)
- Y Y Liu
- Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, People's Republic of China. SEU-JSRI Joint Research Center for The Application of Advanced Carbon Materials, Nanjing 210096, People's Republic of China
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25
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Zhao HW, Sun LT, Guo JW, Zhang WH, Lu W, Wu W, Wu BM, Sabbi G, Juchno M, Hafalia A, Ravaioli E, Xie DZ. Superconducting ECR ion source: From 24-28 GHz SECRAL to 45 GHz fourth generation ECR. Rev Sci Instrum 2018; 89:052301. [PMID: 29864795 DOI: 10.1063/1.5017479] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The development of superconducting ECR source with higher magnetic fields and higher microwave frequency is the most straight forward path to achieve higher beam intensity and higher charge state performance. SECRAL, a superconducting third generation ECR ion source, is designed for 24-28 GHz microwave frequency operation with an innovative magnet configuration of sextupole coils located outside the three solenoids. SECRAL at 24 GHz has already produced a number of record beam intensities, such as 40Ar12+ 1.4 emA, 129Xe26+ 1.1 emA, 129Xe30+ 0.36 emA, and 209Bi31+ 0.68 emA. SECRAL-II, an upgraded version of SECRAL, was built successfully in less than 3 years and has recently been commissioned at full power of a 28 GHz gyrotron and three-frequency heating (28 + 45 + 18 GHz). New record beam intensities for highly charged ion production have been achieved, such as 620 eμA 40Ar16+, 15 eμA 40Ar18+, 146 eμA 86Kr28+, 0.5 eμA 86Kr33+, 53 eμA 129Xe38+, and 17 eμA 129Xe42+. Recent beam test results at SECRAL and SECRAL II have demonstrated that the production of more intense highly charged heavy ion beams needs higher microwave power and higher frequency, as the scaling law predicted. A 45 GHz superconducting ECR ion source FECR (a first fourth generation ECR ion source) is being built at IMP. FECR will be the world's first Nb3Sn superconducting-magnet-based ECR ion source with 6.5 T axial mirror field, 3.5 T sextupole field on the plasma chamber inner wall, and 20 kW at a 45 GHz microwave coupling system. This paper will focus on SECRAL performance studies at 24-28 GHz and technical design of 45 GHz FECR, which demonstrates a technical path for highly charged ion beam production from 24 to 28 GHz SECRAL to 45 GHz FECR.
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Affiliation(s)
- H W Zhao
- Institute of Modern Physics (IMP), CAS, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics (IMP), CAS, Lanzhou 730000, China
| | - J W Guo
- Institute of Modern Physics (IMP), CAS, Lanzhou 730000, China
| | - W H Zhang
- Institute of Modern Physics (IMP), CAS, Lanzhou 730000, China
| | - W Lu
- Institute of Modern Physics (IMP), CAS, Lanzhou 730000, China
| | - W Wu
- Institute of Modern Physics (IMP), CAS, Lanzhou 730000, China
| | - B M Wu
- Institute of Modern Physics (IMP), CAS, Lanzhou 730000, China
| | - G Sabbi
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - M Juchno
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - A Hafalia
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - E Ravaioli
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - D Z Xie
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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26
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He LB, Wang YL, Xie X, Han M, Song FQ, Wang BJ, Cheng WL, Xu HX, Sun LT. Correction: Systematic investigation of the SERS efficiency and SERS hotspots in gas-phase deposited Ag nanoparticle assemblies. Phys Chem Chem Phys 2017; 19:17469. [PMID: 28653071 DOI: 10.1039/c7cp90136d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Correction for 'Systematic investigation of the SERS efficiency and SERS hotspots in gas-phase deposited Ag nanoparticle assemblies' by L. B. He et al., Phys. Chem. Chem. Phys., 2017, 19, 5091-5101.
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Affiliation(s)
- L B He
- SEU-FEI Nano-Pico Centre, Key Lab of MEMS of Ministry of Education, Southeast University, Nanjing 210096, P. R. China.
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27
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He LB, Wang YL, Xie X, Han M, Song FQ, Wang BJ, Chen WL, Xu HX, Sun LT. Systematic investigation of the SERS efficiency and SERS hotspots in gas-phase deposited Ag nanoparticle assemblies. Phys Chem Chem Phys 2017; 19:5091-5101. [DOI: 10.1039/c6cp08513j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Revealing the SERS hotspots and SERS efficiencies of Ag nanoparticle assemblies based on the design of multifarious rainbow-like nanoparticle bands.
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Affiliation(s)
- L. B. He
- SEU-FEI Nano-Pico Centre
- Key Lab of MEMS of Ministry of Education
- Southeast University
- Nanjing 210096
- P. R. China
| | - Y. L. Wang
- SEU-FEI Nano-Pico Centre
- Key Lab of MEMS of Ministry of Education
- Southeast University
- Nanjing 210096
- P. R. China
| | - X. Xie
- SEU-FEI Nano-Pico Centre
- Key Lab of MEMS of Ministry of Education
- Southeast University
- Nanjing 210096
- P. R. China
| | - M. Han
- National Laboratory of Solid State Microstructures
- Nanjing University
- Nanjing 210093
- P. R. China
| | - F. Q. Song
- National Laboratory of Solid State Microstructures
- Nanjing University
- Nanjing 210093
- P. R. China
| | - B. J. Wang
- SEU-FEI Nano-Pico Centre
- Key Lab of MEMS of Ministry of Education
- Southeast University
- Nanjing 210096
- P. R. China
| | - W. L. Chen
- Department of Chemical Engineering
- Monash University
- Victoria 3800
- Australia
| | - H. X. Xu
- Centre for Nanoscience and Nanotechnology
- School of Physics and Technology, and Institute for Advanced Studies
- Wuhan University
- Wuhan 430072
- China
| | - L. T. Sun
- SEU-FEI Nano-Pico Centre
- Key Lab of MEMS of Ministry of Education
- Southeast University
- Nanjing 210096
- P. R. China
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28
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Liu YY, Guo X, Zhu L, Wang XJ, Ge C, Zhao L, Chen J, Zhang Y, Wang ZM, Sun LT. ZnO nanosheet-assisted immobilization of Ag nanoparticles on graphene/Ni foam for highly efficient reduction of 4-nitrophenol. RSC Adv 2017. [DOI: 10.1039/c7ra01296a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
ZnO nanosheet-assisted immobilization of Ag nanoparticles on graphene/Ni foam forming a novel hybrid structure for catalysis.
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29
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Wu Q, Ma HY, Yang Y, Sun LT, Zhang XZ, Zhang ZM, Zhao HY, He Y, Zhao HW. Status of intense permanent magnet proton source for China-accelerator driven sub-critical system Linac. Rev Sci Instrum 2016; 87:02B903. [PMID: 26932075 DOI: 10.1063/1.4932314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Two compact intense 2.45 GHz permanent magnet proton sources and their corresponding low energy beam transport (LEBT) system were developed successfully for China accelerator driven sub-critical system in 2014. Both the proton sources operate at 35 kV potential. The beams extracted from the ion source are transported by the LEBT, which is composed of two identical solenoids, to the 2.1 MeV Radio-Frequency Quadrupole (RFQ). In order to ensure the safety of the superconducting cavities during commissioning, an electrostatic-chopper has been designed and installed in the LEBT line that can chop the continuous wave beam into a pulsed one. The minimum width of the pulse is less than 10 μs and the fall/rise time of the chopper is about 20 ns. The performance of the proton source and the LEBT, such as beam current, beam profile, emittance and the impact to RFQ injection will be presented.
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Affiliation(s)
- Q Wu
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - H Y Ma
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - Y Yang
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - L T Sun
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - X Z Zhang
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - Z M Zhang
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - H Y Zhao
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - Y He
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - H W Zhao
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
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30
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Lu W, Qian C, Sun LT, Zhang XZ, Fang X, Guo JW, Yang Y, Feng YC, Ma BH, Xiong B, Ruan L, Zhao HW, Zhan WL, Xie D. High intensity high charge state ion beam production with an evaporative cooling magnet ECRIS. Rev Sci Instrum 2016; 87:02A738. [PMID: 26931956 DOI: 10.1063/1.4936183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
LECR4 (Lanzhou ECR ion source No. 4) is a room temperature electron cyclotron resonance ion source, designed to produce high current, high charge state ion beams for the SSC-LINAC injector (a new injector for sector separated cyclotron) at the Institute of Modern Physics. LECR4 also serves as a PoP machine for the application of evaporative cooling technology in accelerator field. To achieve those goals, LECR4 ECR ion source has been optimized for the operation at 18 GHz. During 2014, LECR4 ion source was commissioned at 18 GHz microwave of 1.6 kW. To further study the influence of injection stage to the production of medium and high charge state ion beams, in March 2015, the injection stage with pumping system was installed, and some optimum results were produced, such as 560 eμA of O(7+), 620 eμA of Ar(11+), 430 eμA of Ar(12+), 430 eμA of Xe(20+), and so on. The comparison will be discussed in the paper.
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Affiliation(s)
- W Lu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - C Qian
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - X Z Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - X Fang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - J W Guo
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - Y Yang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - Y C Feng
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - B H Ma
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - B Xiong
- Institute of Electrical Engineering, CAS, Beijing 100190, China
| | - L Ruan
- Institute of Electrical Engineering, CAS, Beijing 100190, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - W L Zhan
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - D Xie
- Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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Zhao HY, Zhang JJ, Jin QY, Liu W, Wang GC, Sun LT, Zhang XZ, Zhao HW. New development of laser ion source for highly charged ion beam production at Institute of Modern Physics (invited). Rev Sci Instrum 2016; 87:02A917. [PMID: 26931978 DOI: 10.1063/1.4937115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A laser ion source based on Nd:YAG laser has been being studied at the Institute of Modern Physics for the production of high intensity high charge state heavy ion beams in the past ten years, for possible applications both in a future accelerator complex and in heavy ion cancer therapy facilities. Based on the previous results for the production of multiple-charged ions from a wide range of heavy elements with a 3 J/8 ns Nd:YAG laser [Zhao et al., Rev. Sci. Instrum. 85, 02B910 (2014)], higher laser energy and intensity in the focal spot are necessary for the production of highly charged ions from the elements heavier than aluminum. Therefore, the laser ion source was upgraded with a new Nd:YAG laser, the maximum energy of which is 8 J and the pulse duration can be adjusted from 8 to 18 ns. Since then, the charge state distributions of ions from various elements generated by the 8 J Nd:YAG laser were investigated for different experimental conditions, such as laser energy, pulse duration, power density in the focal spot, and incidence angle. It was shown that the incidence angle is one of the most important parameters for the production of highly charged ions. The capability of producing highly charged ions from the elements lighter than silver was demonstrated with the incidence angle of 10° and laser power density of 8 × 10(13) W cm(-2) in the focal spot, which makes a laser ion source complementary to the superconducting electron cyclotron resonance ion source for the future accelerator complex especially in terms of the ion beam production from some refractory elements. Nevertheless, great efforts with regard to the extraction of intense ion beams, modification of the ion beam pulse duration, and reliability of the ion source still need to be made for practical applications.
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Affiliation(s)
- H Y Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - J J Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Q Y Jin
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - W Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - G C Wang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - X Z Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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Yang Y, Dou WP, Sun LT, Yao QG, Zhang ZM, Yuan YJ, He Y, Zh XZ, Zhao HW. Simulation study of LEBT for transversely coupled beam from an ECR ion source. Rev Sci Instrum 2016; 87:02B910. [PMID: 26932082 DOI: 10.1063/1.4933080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A Low-Energy intense-highly charged ion Accelerator Facility (LEAF) program has been launched at Institute of Modern Physics. This accelerator facility consists of a superconducting Electron Cyclotron Resonance (ECR) ion source, a Low Energy Beam Transport (LEBT) system, and a Radio Frequency Quadrupole (RFQ). It is especially of interest for the extracted ion beam from the ECR ion source, which is transversely coupled, and this property will significantly affect the beam transmission in the LEBT line and the matching with the downstream RFQ. In the beam transport design of LEAF, beam decoupling in the LEBT is considered to lower down the projection emittances and the feasibility of the design has been verified by beam simulation with a transversely coupled beam from the ECR ion source.
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Affiliation(s)
- Y Yang
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - W P Dou
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - Q G Yao
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - Z M Zhang
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - Y J Yuan
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - Y He
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - X Z Zh
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics, CAS, Lanzhou 730000, China
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33
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Lu W, Sun LT, Qian C, Guo JW, Fang X, Feng YC, Yang Y, Ma HY, Zhang XZ, Ma BH, Xiong B, Guo SQ, Ruan L, Zhao HW. The development of a room temperature electron cyclotron resonance ion source (Lanzhou electron cyclotron resonance ion source No. 4) with evaporative cooling technology at Institute of Modern Physics. Rev Sci Instrum 2015; 86:043301. [PMID: 25933849 DOI: 10.1063/1.4916658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
LECR4 (Lanzhou electron cyclotron resonance ion source No. 4) has been successfully constructed at IMP and has also been connected with the Low Energy Beam Transport (LEBT) and Radio Frequency Quadrupole (RFQ) systems. These source magnet coils are cooled through evaporative cooling technology, which is the first attempt with an ECR ion source in the world. The maximum mirror field is 2.5 T (with iron plug) and the effective plasma chamber volume is 1.2 l. It was designed to be operated at 18 GHz and aimed to produce intense multiple charge state heavy ion beams for the linear injector project SSC-Linac at IMP. In February 2014, the first analyzed beam at 18 GHz was extracted. During about three months' commissioning, some outstanding results have been achieved, such as 1.97 emA of O(6+), 1.7 emA of Ar(8+), 1.07 emA of Ar(9+), and 118 euA of Bi(28+). The source has also successfully delivered O(5+) and Ar(8+) ion beams for RFQ commissioning in April 2014. This paper will give a brief overview of the design of LECR4. Then, the latest results of this source at 18 GHz will be presented.
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Affiliation(s)
- W Lu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - C Qian
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - J W Guo
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - X Fang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - Y C Feng
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - Y Yang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - H Y Ma
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - X Z Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - B H Ma
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - B Xiong
- Institute of Electrical Engineering, CAS, Beijing 100190, China
| | - S Q Guo
- Institute of Electrical Engineering, CAS, Beijing 100190, China
| | - L Ruan
- Institute of Electrical Engineering, CAS, Beijing 100190, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
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Yang Y, Yuan YJ, Sun LT, Feng YC, Fang X, Cao Y, Lu W, Zhang XZ, Zhao HW. Transverse coupling property of beam from ECR ion sources. Rev Sci Instrum 2014; 85:113305. [PMID: 25430108 DOI: 10.1063/1.4901591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Experimental evidence of the property of transverse coupling of beam from Electron Cyclotron Resonance (ECR) ion source is presented. It is especially of interest for an ECR ion source, where the cross section of extracted beam is not round along transport path due to the magnetic confinement configuration. When the ions are extracted and accelerated through the descending axial magnetic field at the extraction region, the horizontal and vertical phase space strongly coupled. In this study, the coupling configuration between the transverse phase spaces of the beam from ECR ion source is achieved by beam back-tracking simulation based on the measurements. The reasonability of this coupling configuration has been proven by a series of subsequent simulations.
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Affiliation(s)
- Y Yang
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - Y J Yuan
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - Y C Feng
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - X Fang
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - Y Cao
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - W Lu
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - X Z Zhang
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics, CAS, Lanzhou 730000, China
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35
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Yang Y, Sun LT, Feng YC, Fang X, Lu W, Zhang WH, Cao Y, Zhang XZ, Zhao HW. Studies on a Q/A selector for the SECRAL electron cyclotron resonance ion source. Rev Sci Instrum 2014; 85:083301. [PMID: 25173256 DOI: 10.1063/1.4891418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Electron cyclotron resonance ion sources are widely used in heavy ion accelerators in the world because they are capable of producing high current beams of highly charged ions. However, the design of the Q/A selector system for these devices is challenging, because it must have a sufficient ion resolution while controlling the beam emittance growth. Moreover, this system has to be matched for a wide range of ion beam species with different intensities. In this paper, research on the Q/A selector system at the SECRAL (Superconducting Electron Cyclotron Resonance ion source with Advanced design in Lanzhou) platform both in experiment and simulation is presented. Based on this study, a new Q/A selector system has been designed for SECRAL II. The features of the new design including beam simulations are also presented.
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Affiliation(s)
- Y Yang
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - Y C Feng
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - X Fang
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - W Lu
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - W H Zhang
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - Y Cao
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - X Z Zhang
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics, CAS, Lanzhou 730000, China
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36
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Jin QY, Zhao HY, Zhang JJ, Sha S, Zhang ZL, Li ZM, Liu W, Zhang XZ, Sun LT, Zhao HW. Simulation of direct plasma injection for laser ion beam acceleration with a radio frequency quadrupole. Rev Sci Instrum 2014; 85:073304. [PMID: 25085131 DOI: 10.1063/1.4890155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The direct plasma injection scheme (DPIS) has been being studied at Institute of Modern Physics since several years ago. A C(6+) beam with peak current of 13 mA, energy of 593 keV/u has been successfully achieved after acceleration with DPIS method. To understand the process of DPIS, some simulations have been done as follows. First, with the total current intensity and the relative yields of different charge states for carbon ions measured at the different distance from the target, the absolute current intensities and time-dependences for different charge states are scaled to the exit of the laser ion source in the DPIS. Then with these derived values as the input parameters, the extraction of carbon beam from the laser ion source to the radio frequency quadrupole with DPIS is simulated, which is well agreed with the experiment results.
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Affiliation(s)
- Q Y Jin
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - H Y Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - J J Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Sh Sha
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Zh L Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Zh M Li
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - W Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - X Zh Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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37
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Jin QY, Zhao HY, Sha S, Zhang JJ, Li ZM, Liu W, Zhang XZ, Sun LT, Zhao HW. Study on space charge effect in an electrostatic ion analyzer applied to measure laser produced ions. Rev Sci Instrum 2014; 85:033307. [PMID: 24689575 DOI: 10.1063/1.4869015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The abundance of different ions produced by laser ion sources is usually analyzed by an electrostatic ion analyzer (EIA). Ion current intensities in the range of several mA/cm(2) at the position of the EIA have been achieved from the laser ion source developed by the Institute of Modern Physics; this indicates that a noticeable influence of space charge effect during the ion transmission will occur. Hence, while the parameters of the EIA or the beams are changed, such as ion species, current intensity, the ions' transmission efficiency through the EIA is different, which will result in an uncertainty in the estimation of the ions' yields. Special attention is focused on this issue in this paper. Ion's transmissions through the EIA under different circumstances are studied with simulations and experiments, the results of which are consistent with each other.
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Affiliation(s)
- Q Y Jin
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - H Y Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - S Sha
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - J J Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Zh M Li
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - W Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - X Zh Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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38
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Zhao HY, Jin QY, Sha S, Zhang JJ, Li ZM, Liu W, Sun LT, Zhang XZ, Zhao HW. The study towards high intensity high charge state laser ion sources. Rev Sci Instrum 2014; 85:02B910. [PMID: 24593615 DOI: 10.1063/1.4833921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
As one of the candidate ion sources for a planned project, the High Intensity heavy-ion Accelerator Facility, a laser ion source has been being intensively studied at the Institute of Modern Physics in the past two years. The charge state distributions of ions produced by irradiating a pulsed 3 J/8 ns Nd:YAG laser on solid targets of a wide range of elements (C, Al, Ti, Ni, Ag, Ta, and Pb) were measured with an electrostatic ion analyzer spectrometer, which indicates that highly charged ions could be generated from low-to-medium mass elements with the present laser system, while the charge state distributions for high mass elements were relatively low. The shot-to-shot stability of ion pulses was monitored with a Faraday cup for carbon target. The fluctuations within ±2.5% for the peak current and total charge and ±6% for pulse duration were demonstrated with the present setup of the laser ion source, the suppression of which is still possible.
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Affiliation(s)
- H Y Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Q Y Jin
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - S Sha
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - J J Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Z M Li
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - W Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - X Z Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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39
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Lin SH, Fang X, Zhang HJ, Qian C, Ma BH, Wang H, Li XX, Zhang XZ, Sun LT, Zhang ZM, Yuan P, Zhao HW. Study on a negative hydrogen ion source with hot cathode arc discharge. Rev Sci Instrum 2014; 85:02B120. [PMID: 24593560 DOI: 10.1063/1.4847275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A negative hydrogen (H(-)) ion source with hot cathode arc discharge was designed and fabricated as a primary injector for a 10 MeV PET cyclotron at IMP. 1 mA dc H(-) beam with ɛ N, RMS = 0.08 π mm mrad was extracted at 25 kV. Halbach hexapole was adopted to confine the plasma. The state of arc discharge, the parameters including filament current, arc current, gas pressure, plasma electrode bias, and the ratio of I(e(-))/I(H(-)) were experimentally studied. The discussion on the result, and opinions to improve the source were given.
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Affiliation(s)
- S H Lin
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - X Fang
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - H J Zhang
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - C Qian
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - B H Ma
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - H Wang
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - X X Li
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - X Z Zhang
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - L T Sun
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - Z M Zhang
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - P Yuan
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - H W Zhao
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
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40
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Xiong B, Ruan L, Gu GB, Guo SQ, Cao R, Li ZG, Lu W, Zhang XZ, Sun LT, Zhao HW. Application of evaporative cooling technology in super-high power density magnet. Rev Sci Instrum 2014; 85:02A913. [PMID: 24593492 DOI: 10.1063/1.4827113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Evaporative cooling technology utilizes phase-change heat transfer mode to achieve the cooling for heating equipment. The heat transfer capacity of evaporative cooling technology is far more than air or water cooling technology. The Electron Cyclotron Resonance ion source magnet is a typical super-high power density magnet, and the evaporative cooling technology is an ideal cooling method for the coils of magnet. In this paper we show the structure and process of coils and the special design of flow channels of coolant for an experiment magnet model. Additionally, the heat transfer circulation is presented and analyzed. By the finite element method, the flow channels are optimized to rationally allocate coolant and to reduce the temperature of coils. For the experiment model, the current density of copper wire of coils is 19 A/mm(2), and the coil-windows current density is larger than 12 A/mm(2). The max temperature of coils is below 80 °C, and the total heat is about 200 kW.
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Affiliation(s)
- B Xiong
- Institute of Electrical Engineering, CAS, Beijing 100190, China
| | - L Ruan
- Institute of Electrical Engineering, CAS, Beijing 100190, China
| | - G B Gu
- Institute of Electrical Engineering, CAS, Beijing 100190, China
| | - S Q Guo
- Institute of Electrical Engineering, CAS, Beijing 100190, China
| | - R Cao
- Institute of Electrical Engineering, CAS, Beijing 100190, China
| | - Z G Li
- Institute of Electrical Engineering, CAS, Beijing 100190, China
| | - W Lu
- Institute of Modern Physics, CAS, Lanzhou 73000, China
| | - X Z Zhang
- Institute of Modern Physics, CAS, Lanzhou 73000, China
| | - L T Sun
- Institute of Modern Physics, CAS, Lanzhou 73000, China
| | - H W Zhao
- Institute of Modern Physics, CAS, Lanzhou 73000, China
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41
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Lu W, Xiong B, Zhang XZ, Sun LT, Feng YC, Ma BH, Guo SQ, Cao R, Ruan L, Zhao HW. Progress of a room temperature electron cyclotron resonance ion source using evaporative cooling technology at Institute of Modern Physics. Rev Sci Instrum 2014; 85:02A926. [PMID: 24593505 DOI: 10.1063/1.4827575] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A new room temperature ECR ion source, Lanzhou Electron Cyclotron Resonance ion source No. 4 (LECR4, previously named DRAGON), is under intense construction at Institute of Modern Physics. LECR4 is designed to operate with 18 GHz microwave frequency. The maximum axial magnetic fields are 2.3 T at injection and 1.3 T at extraction, and the radial field at the plasma chamber wall of 76 mm inner diameter is 1.0-1.2 T. One of the unique features for LECR4 is that its axial solenoids are winded with solid square copper wires which are immersed in a kind of special evaporative cooling medium for cooling purpose. Till now, a prototype of the cooling system has been successfully constructed and tested, which has demonstrated that the cooling efficiency of the designed system could meet the requirements of LECR4 under the routine operation conditions. All the main components of the ion source have been completed. Assembly and commissioning is ongoing. The latest developments and test results will be presented in this paper.
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Affiliation(s)
- W Lu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - B Xiong
- Institute of Electrical Engineering, CAS, Beijing 100190, China
| | - X Z Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - L T Sun
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - Y C Feng
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - B H Ma
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
| | - S Q Guo
- Institute of Electrical Engineering, CAS, Beijing 100190, China
| | - R Cao
- Institute of Electrical Engineering, CAS, Beijing 100190, China
| | - L Ruan
- Institute of Electrical Engineering, CAS, Beijing 100190, China
| | - H W Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China
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42
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Wu Q, Zhang ZM, Sun LT, Yang Y, Ma HY, Cao Y, Zhang XZ, Zhao HW. A 2.45 GHz intense proton source and low energy beam transport system for China Initiative Accelerator Driven Sub-Critical reactor system. Rev Sci Instrum 2014; 85:02A703. [PMID: 24593437 DOI: 10.1063/1.4824804] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
At Institute of Modern Physics, a cw 35 keV, 20 mA intense proton source and the low energy beam transport system (LEBT) have been developed for China Initiative Accelerator Driven Sub-Critical reactor system. In order to ensure high quality transmission of the intense ion beam from the exit of ion source to Radio Frequency Quadrupole (RFQ), a low energy beam transport line is used to focus beam to the RFQ entrance and match the Twiss parameters to the RFQ requirements. The 35 keV, 20 mA ion beam extracted by a three-electrode extraction system from the ion source passes through the LEBT to the RFQ entrance and the root-mean-square emittance is measured to be less than 0.2 π mm mrad. The commissioning results of the ion source and low energy beam transport system are described in this paper. The beam quality and transmission efficiency are also studied.
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Affiliation(s)
- Q Wu
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - Z M Zhang
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - L T Sun
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - Y Yang
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - H Y Ma
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - Y Cao
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - X Z Zhang
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - H W Zhao
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
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43
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Yang Y, Sun LT, Hu Q, Cao Y, Lu W, Feng YC, Fang X, Zhang XZ, Zhao HW, Xie DZ. Studies on low energy beam transport for high intensity high charged ions at IMP. Rev Sci Instrum 2014; 85:02A719. [PMID: 24593453 DOI: 10.1063/1.4832935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Superconducting Electron Cyclotron Resonance ion source with Advanced design in Lanzhou (SECRAL) is an advanced fully superconducting ECR ion source at IMP designed to be operational at the microwave frequency of 18-24 GHz. The existing SECRAL beam transmission line is composed of a solenoid lens and a 110° analyzing magnet. Simulations of particle tracking with 3D space charge effect and realistic 3D magnetic fields through the line were performed using particle-in-cell code. The results of the beam dynamics show that such a low energy beam is very sensitive to the space charge effect and significantly suffers from the second-order aberration of the analyzing magnet resulting in large emittance. However, the second-order aberration could be reduced by adding compensating sextupole components in the beam line. On this basis, a new 110° analyzing magnet with relatively larger acceptance and smaller aberration is designed and will be used in the design of low energy beam transport line for a new superconducting ECR ion source SECRAL-II. The features of the analyzer and the corresponding beam trajectory calculation will be detailed and discussed in this paper.
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Affiliation(s)
- Y Yang
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - Q Hu
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - Y Cao
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - W Lu
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - Y C Feng
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - X Fang
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - X Z Zhang
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - H W Zhao
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - D Z Xie
- Institute of Modern Physics, CAS, Lanzhou 730000, China
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Lu W, Li JY, Kang L, Liu HP, Li H, Li JD, Sun LT, Ma XW. Operation of Lanzhou all permanent electron cyclotron resonance ion source No. 2 on 320 kV platform with highly charged ions. Rev Sci Instrum 2014; 85:02A947. [PMID: 24593526 DOI: 10.1063/1.4852215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The 320 kV platform for multi-discipline research with highly charged ions is a heavy ion beam acceleration instrument developed by Institute of Modern Physics, which is dedicated to basic scientific researches such as plasma, atom, material physics, and astrophysics, etc. The platform has delivered ion beams of 400 species for 36,000 h. The average operation time is around 5000 h/year. With the beams provided by the platform, lots of outstanding progresses were made in various research fields. The ion source of the platform is an all-permanent magnet electron cyclotron resonance ion source, LAPECR2 (Lanzhou All Permanent ECR ion source No. 2). The maximum axial magnetic fields are 1.28 T at injection and 1.07 T at extraction, and the radial magnetic field is up to 1.21 T at the inner wall of the plasma chamber. The ion source is capable to produce low, medium, and high charge state gaseous and metallic ion beams, such as H(+), (40)Ar(8+), (129)Xe(30+), (209)Bi(33+), etc. This paper will present the latest result of LAPECR2 and the routine operation status for the high voltage platform.
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Affiliation(s)
- W Lu
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - J Y Li
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - L Kang
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - H P Liu
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - H Li
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - J D Li
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - L T Sun
- Institute of Modern Physics, CAS, Lanzhou 730000, China
| | - X W Ma
- Institute of Modern Physics, CAS, Lanzhou 730000, China
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Yang Y, Zhang ZM, Wu Q, Zhang WH, Ma HY, Sun LT, Zhang XZ, Liu ZW, He Y, Zhao HW, Xie DZ. A low energy beam transport system for proton beam. Rev Sci Instrum 2013; 84:033306. [PMID: 23556814 DOI: 10.1063/1.4796096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A low energy beam transport (LEBT) system has been built for a compact pulsed hadron source (CPHS) at Tsinghua University in China. The LEBT, consisting of two solenoids and three short-drift sections, transports a pulsed proton beam of 60 mA of energy of 50 keV to the entrance of a radio frequency quadrupole (RFQ). Measurement has shown a normalized RMS beam emittance less than 0.2 π mm mrad at the end of the LEBT. Beam simulations were carried out to compare with the measurement and are in good agreement. Based on the successful CPHS LEBT development, a new LEBT for a China ADS projector has been designed. The features of the new design, including a beam chopper and beam simulations of the LEBT are presented and discussed along with CPHS LEBT development in this article.
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Affiliation(s)
- Y Yang
- Institute of Modern Physics, CAS, Lanzhou 730000, China.
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Shi H, Wang LL, Sun LT, Dong LL, Liu B, Chen LP. Cell division and endoreduplication play important roles in stem swelling of tuber mustard (Brassica juncea Coss. var. tumida Tsen et Lee). Plant Biol (Stuttg) 2012; 14:956-963. [PMID: 22639957 DOI: 10.1111/j.1438-8677.2012.00580.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We investigated spatio-temporal variations in cell division and the occurrence of endoreduplication in cells of tuber mustard stems during development. Cells in the stem had 8C nuclei (C represents DNA content of a two haploid genome), since it is an allotetraploid species derived from diploid Brassica rapa (AA) and B. nigra (BB), thus indicating the occurrence of endoreduplication. Additionally, we observed a dynamic change of cell ploidy in different regions of the swollen stems, with a decrease in 4C proportion in P4-1 and a sharp increase in 8C cells that became the dominant cell type (86.33% at most) in the inner pith cells. Furthermore, cDNAs of 14 cell cycle genes and four cell expansion genes were cloned and their spatial transcripts analysed in order to understand their roles in stem development. The expression of most cell cycle genes peaked in regions of the outer pith (P2 or P3), some genes regulating S/G2 and G2/M (BjCDKB1;2, BjCYCB1;1 and BjCYCB1;2) significantly decrease in P5 and P6, while G1/S regulators (BjE2Fa, BjE2Fb and BjE2Fc) showed a relative high expression level in the inner pith (P5) where cells were undergoing endoreduplication. Coincidentally, BjXTH1and BjXTH2 were exclusively expressed in the endoreduplicated cells. Our results suggest that cells of outer pith regions (P2 and P3) mainly divide for cell proliferation, while cells of the inner pith expand through endoreduplication. Endoreduplication could trigger expression of BjXTH1 and BjXTH2 and thus function in cell expansion of the pith tissue.
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Affiliation(s)
- H Shi
- Department of Horticulture, Zhejiang University, Hangzhou, China
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Zhao HW, Lu W, Zhang XZ, Feng YC, Guo JW, Cao Y, Li JY, Guo XH, Sha S, Sun LT, Xie DZ. Performance and operation of advanced superconducting electron cyclotron resonance ion source SECRAL at 24 GHz. Rev Sci Instrum 2012; 83:02A320. [PMID: 22380167 DOI: 10.1063/1.3666913] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
SECRAL (superconducting ECR ion source with advanced design in Lanzhou) ion source has been in routine operation for Heavy Ion Research Facility in Lanzhou (HIRFL) accelerator complex since May 2007. To further enhance the SECRAL performance in order to satisfy the increasing demand for intensive highly charged ion beams, 3-5 kW high power 24 GHz single frequency and 24 GHz +18 GHz double frequency with an aluminum plasma chamber were tested, and some exciting results were produced with quite a few new record highly charged ion beam intensities, such as (129)Xe(35+) of 64 eμA, (129)Xe(42+) of 3 eμA, (209)Bi(41+) of 50 eμA, (209)Bi(50+) of 4.3 eμA and (209)Bi(54+) of 0.2 eμA. In most cases SECRAL is operated at 18 GHz to deliver highly charged heavy ion beams for the HIRFL accelerator, only for those very high charge states and very heavy ion beams such as (209)Bi(36+) and (209)Bi(41+), SECRAL has been operated at 24 GHz. The total operation beam time provided by SECRAL up to July 2011 has exceeded 7720 hours. In this paper, the latest performance, development, and operation status of SECRAL ion source are presented. The latest results and reliable long-term operation for the HIRFL accelerator have demonstrated that SECRAL performance for production of highly charged heavy ion beams remains improving at higher RF power with optimized tuning.
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Affiliation(s)
- H W Zhao
- Institute of Modern Physics (IMP), Chinese Academy of Sciences, Lanzhou 73000, China.
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Lu W, Xie DZ, Zhang XZ, Xiong B, Ruan L, Sha S, Zhang WH, Cao Y, Lin SH, Guo JW, Fang X, Guo XH, Li XX, Ma HY, Yang Y, Wu Q, Zhao HY, Ma BH, Wang H, Zhu YH, Feng YC, Li JY, Li JQ, Sun LT, Zhao HW. Development of DRAGON electron cyclotron resonance ion source at Institute of Modern Physics. Rev Sci Instrum 2012; 83:02A328. [PMID: 22380175 DOI: 10.1063/1.3669800] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A new room temperature electron cyclotron resonance (ECR) ion source, DRAGON, is under construction at IMP. DRAGON is designed to operate at microwaves of frequencies of 14.5-18 GHz. Its axial solenoid coils are cooled with evaporative medium to provide an axial magnetic mirror field of 2.5 T at the injection and 1.4 T at the extraction, respectively. In comparison to other conventional room temperature ECR ion sources, DRAGON has so far the largest bore plasma chamber of inner diameter of 126 mm with maximum radial fields of 1.4-1.5 T produced by a non-Halbach permanent sextupole magnet.
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Affiliation(s)
- W Lu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China.
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Sun LT, Leitner D, Machicoane G, Pozdeyev E, Smirnov V, Vorozhtsov SB, Winklehner D, Zhao Q. Low energy beam transport for facility for rare isotope beams driver linear particle accelerator. Rev Sci Instrum 2012; 83:02B705. [PMID: 22380310 DOI: 10.1063/1.3665968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The driver linac for the facility for rare isotope beams (FRIB) will provide a wide range of primary ion beams for nuclear physics research. The linac will be capable of accelerating a uranium beam to an energy of up to 200 Mev∕u and delivering it to a fragmentation target with a maximum power of 400 kW. Stable ion beams will be produced by a high performance electron cyclotron resonance ion source operating at 28 GHz. The ion source will be located on a high voltage platform to reach an initial beam energy of 12 keV∕u. After extraction, the ion beam will be transported vertically down to the linac tunnel in a low energy beam transport (LEBT) system and injected into a radio frequency quadrupole (RFQ) operating at a frequency of 80.5 MHz. To meet the beam power requirements, simultaneous acceleration of two-charge states will be used for heavier ions (≥Xe). This paper presents the layout of the FRIB LEBT and the beam dynamics in the LEBT. In particular, simulation and design of the beam line section before charge state selection will be detailed. The need to use an achromatic design for the charge state selection system and the advantage of an ion beam collimation system to limit the emittance of the beam injected into the RFQ will be discussed in this paper.
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Affiliation(s)
- L T Sun
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
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Sha S, Zhao HW, Guo XH, Zhang ZL, Fang X, Guo JW, Zhang WH, Lu W, Cao Y, Ma HY, Lin SH, Li XX, Ma BH, Yang Y, Wang H, Wu Q, Li JY, Feng YC, Zhao HY, Zhu YH, Sun LT, Zhang XZ, Chen XM, Xie DZ. Status of the laser ion source at IMP. Rev Sci Instrum 2012; 83:02B303. [PMID: 22380282 DOI: 10.1063/1.3656391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A laser (Nd:YAG laser, 3 J, 1064 nm, 8-10 ns) ion source has been built and under development at IMP to provide pulsed high-charge-state heavy ion beams to a radio frequency quadrupole (RFQ) for upgrading the IMP accelerators with a new low-energy beam injector. The laser ion source currently operates in a direct plasma injection scheme to inject the high charge state ions produced from a solid target into the RFQ. The maximum power density on the target was about 8.4 × 10(12) W∕cm(2). The preliminary experimental results will be presented and discussed in this paper.
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Affiliation(s)
- S Sha
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 73000, China.
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