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Murakami S, Umeda S, Sozaki M, Miyoshi K, Ishikawa M, Uchiyama A, Ohuchi K, Nakano R. [A case of squamous cell carcinoma of the nipple skin successfully treated with S-1 alone]. Gan To Kagaku Ryoho 2014; 41:913-916. [PMID: 25131884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Squamous cell carcinoma of the breast is uncommon, but that of the nipple skin is rarer. The effect of chemotherapy in these cases is yet to reach consensus. We report a rare case in which primary squamous cell carcinoma of the nipple skin was successfully treated with S-1 alone. A 64-year-old woman was admitted to our hospital because of a granulomatous tumor mass over the right nipple, which she was aware of for 10 years; the tumor showed a rapid increase in growth before admission. The tumor was approximately 4 cm at the first visit, and was diagnosed as squamous cell carcinoma by incisional biopsy. We administered preoperative systemic chemotherapy owing to the presence of metastasis in an axillary lymph node. After 2 courses of chemotherapy with oralS -1 at 100mg/day for 28 days followed by a 14-day resting period, the primary tumor and metastatic lymph node showed a remarkable reduction in size. The patient subsequently underwent a radical operation and is currently healthy without any recurrence.
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Motegi SI, Toki S, Hattori T, Yamada K, Uchiyama A, Ishikawa O. No association of atherosclerosis with digital ulcers in Japanese patients with systemic sclerosis: Evaluation of carotid intima-media thickness and plaque characteristics. J Dermatol 2014; 41:604-8. [DOI: 10.1111/1346-8138.12532] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Accepted: 05/06/2014] [Indexed: 11/27/2022]
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Miyasaka Y, Nabae T, Yanagi C, Yasui T, Kawamoto M, Ishikawa M, Uchiyama A. Laparoscopy-Assisted Distal Gastrectomy for the Eldest Elderly Patients with Gastric Cancer. HEPATO-GASTROENTEROLOGY 2014; 61:1133-1137. [PMID: 26158176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
BACKGROUND/AIMS The number of the eldest elderly (aged 85 years and older) patients with gastric cancer has been rising in Japan. Laparoscopy-assisted distal gastrectomy (LADG) has been accepted as a less invasive treatment for gastric cancer. The purpose of this study is to evaluate the efficacy and safety of LADG for eldest elderly patents. METHODOLOGY From January 2006 to July 2010, 262 patients underwent LADG for gastric cancer. Of these, 9 patients were 85 years old and over (eldest elderly group) and the remaining 253 patients were younger than 85 years (control group). Clinicopathological characteristics and operative outcomes were analyzed. RESULTS Among clinicopathological characteristics analyzed in this study (gender, body mass index, co-morbidity, American Society of Anesthesiologists physical status and tumor status), only gender showed a significant difference between the eldest elderly and the control groups. There were no significant differences in operation time, blood loss, postoperative complication and postoperative hospital stay between the 2 groups. No serious complications or mortality were found in the eldest elderly group. CONCLUSIONS It is suggested that LADG is a safe and efficient procedure for the treatment of gastric cancer, even in eldest elderly patients.
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Uchiyama A, Yamada K, Ogino S, Yokoyama Y, Takeuchi Y, Udey MC, Ishikawa O, Motegi SI. MFG-E8 regulates angiogenesis in cutaneous wound healing. THE AMERICAN JOURNAL OF PATHOLOGY 2014; 184:1981-90. [PMID: 24838098 DOI: 10.1016/j.ajpath.2014.03.017] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Revised: 02/02/2014] [Accepted: 03/21/2014] [Indexed: 12/20/2022]
Abstract
Our research group recently demonstrated that pericytes are major sources of the secreted glycoprotein and integrin ligand lactadherin (MFG-E8) in B16 melanoma tumors, and that MFG-E8 promotes angiogenesis via enhanced PDGF-PDGFRβ signaling mediated by integrin-growth factor receptor crosstalk. However, sources of MFG-E8 and its possible roles in skin physiology are not well characterized. The objective of this study was to characterize the involvement of MFG-E8 in skin wound healing. In the dermis of normal murine and human skin, accumulations of MFG-E8 were found around CD31(+) blood vessels, and MFG-E8 colocalized with PDGFRβ(+), αSMA(+), and NG2(+) pericytes. MFG-E8 protein and mRNA levels were elevated in the dermis during full-thickness wound healing in mice. MFG-E8 was diffusely present in granulation tissue and was localized around blood vessels. Wound healing was delayed in MFG-E8 knockout mice, compared with the wild type, and myofibroblast and vessel numbers in wound areas were significantly reduced in knockout mice. Inhibition of MFG-E8 production with siRNA attenuated the formation of capillary-like structures in vitro. Expression of MFG-E8 in fibrous human granulation tissue with scant blood vessels was less than that in granulation tissue with many blood vessels. These findings suggest that MFG-E8 promotes cutaneous wound healing by enhancing angiogenesis.
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Motegi SI, Uchiyama A, Yamada K, Ogino S, Takeuchi Y, Ishikawa O. Blepharochalasis: Possibly associated with matrix metalloproteinases. J Dermatol 2014; 41:536-8. [DOI: 10.1111/1346-8138.12503] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2014] [Accepted: 03/29/2014] [Indexed: 10/25/2022]
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106
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Uchiyama A, Tamura A, Etsuko O, Motegi SI, Ishikawa O. Involuted facial infantile hemangioma with fatty replacement successfully treated with surgery. J Dermatol 2014; 41:453-4. [DOI: 10.1111/1346-8138.12457] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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107
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Uramoto H, Nakanishi R, Uchiyama A, Inoue M, Sugaya M, Iwata T, Ebi N, Hanagiri T, Tanaka F. Phase II trial of carboplatin/docetaxel in patients with resected NSCLC. World J Respirol 2014; 4:1-7. [DOI: 10.5320/wjr.v4.i1.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 01/17/2014] [Accepted: 02/19/2014] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the development of a safer chemotherapeutic regimen with better compliance, a total of 67 patients were enrolled as a single arm in a two-stage multi-center phase II study.
METHODS: The patients received chemotherapy with carboplatin (CBDCA) with an area under the curve (AUC) of 5, and docetaxel (DTX) at 60 mg/m2 tri-weekly for three cycles after surgery. The primary endpoint of this study was compliance, while the secondary endpoints were the adverse events (AE) and recurrence-free survival (RFS).
RESULTS: Sixty-one patients were treated in this study arm. The patients were 43 males and 18 females, with a median age of 64.6 years. Fifty-one patients (83.6%) completed all three cycles of therapy. The presence of Grade 3 and 4 neutropenia was noted in 25% and 66% of the patients, respectively. The non-hematological AE were less frequently reported, and no treatment-related death was registered. The two-year RFS and OS rates of the 61 patients were 69.8% and 88.3%, respectively.
CONCLUSION: A tri-weekly schedule of CBDCA and DTX as adjuvant chemotherapy showed a favorable feasibility.
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Kawamura H, Ando S, Aoki T, Arikawa H, Ezure S, Harada K, Hayamizu T, Inoue T, Ishikawa T, Itoh M, Kato K, Kato T, Nataraj HS, Sato T, Uchiyama A, Aoki T, Furukawa T, Hatakeyama A, Hatanaka K, Imai K, Murakami T, Shimizu Y, Wakasa T, Yoshida HP, Sakemi Y. Search for a permanent EDM using laser cooled radioactive atom. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20146605009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Sato T, Ando S, Aoki T, Arikawa H, Ezure S, Harada K, Hayamizu T, Inoue T, Ishikawa T, Itoh M, Kato K, Kato T, Kawamura H, Nataraj HS, Uchiyama A, Aoki T, Furukawa T, Hatakeyama A, Hatanaka K, Imai K, Murakami T, Shimizu Y, Wakasa T, Yoshida HP, Sakemi Y. Development of francium atomic beam for the search of the electron electric dipole moment. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20146605019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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110
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Arikawa H, Ando S, Aoki T, Ezure S, Harada K, Hayamizu T, Inoue T, Ishikawa T, Itoh M, Kawamura H, Kato K, Kato T, Uchiyama A, Aoki T, Furukawa T, Hatakeyama A, Hatanaka K, Imai K, Murakami T, Nataraj HS, Sato T, Shimizu Y, Wakasa T, Yoshida HP, Sakemi Y. Radioactive ion beam transportation for the fundamental symmetry study with laser-trapped atoms. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:02A732. [PMID: 24593466 DOI: 10.1063/1.4852218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The search for the violation of the fundamental symmetry in a radioactive atom is the promising candidate for precision tests of the standard model and its possible extensions. The subtle signal arising from the symmetry violation is enhanced in heavy atoms, such as a francium (Fr). To realize high precision measurements, a large amount of radioactive isotopes is required. The Fr is produced via a nuclear fusion reaction using a melted gold target with a (18)O primary beam at Cyclotron and Radioisotope Center, Tohoku University. The maximum extraction efficiency of the Fr ion was achieved at approximately 35%. The beam line consists of an electrostatic deflector, three electrostatic quadrupole triplets to the measurement area at 10 m away from the reaction point, and several beam diagnosis systems. We optimized parameters of the beam line.
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Uchiyama A, Furukawa K, Higurashi Y, Nakagawa T. Implementation of an operator intervention system for remote control of the RIKEN 28 GHz superconducting electron cyclotron resonance ion source. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:02A904. [PMID: 24593483 DOI: 10.1063/1.4825383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The control system for the RIKEN 28 GHz superconducting electron cyclotron resonance ion source (28 GHz SC-ECRIS) consists of a distributed control system based on the experimental physics and industrial control system. To maintain the beam quality for the long beam-service time at the radioactive isotope beam factory, beam tuning to prevent subtle changes in the 28 GHz SC-ECRIS conditions is required. Once this is achieved, it should then be possible to check conditions and operate the ion source at any time. We have designed a web-based operational interface to remotely control the ion source, but for access and control from several locations, suitable access security, policies, and methods are required. We thus implemented an operator intervention system that makes it possible to safely access the network externally with the permission of on-site accelerator operators in the control room.
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Uchiyama A, Motegi SI, Yamada K, Uehara A, Ishikawa O. Case of angioedema and urticaria induced by lenalidomide. J Dermatol 2014; 41:179-81. [DOI: 10.1111/1346-8138.12379] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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113
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Motegi SI, Kato M, Uchiyama A, Yamada K, Shimizu A, Amano H, Ishikawa O. Persistent prurigo nodularis in HIV-infected patient responsive to antiretroviral therapy with raltegravir. J Dermatol 2014; 41:272-3. [DOI: 10.1111/1346-8138.12408] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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114
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Inoue T, Ando S, Aoki T, Arikawa H, Ezure S, Harada K, Hayamizu T, Ishikawa T, Itoh M, Kato K, Kato T, Kawamura H, Nataraj H, Sato T, Uchiyama A, Aoki T, Furukawa T, Hatakeyama A, Hatanaka K, Imai K, Murakami T, Shimizu Y, Wakasa T, Yoshida H, Sakemi Y. Development of the Measurement System for the Search of an Electric Dipole Moment of the Electron with Laser-Cooled Francium Atoms. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20146605008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Motegi SI, Uchiyama A, Yamada K, Uehara A, Toki S, Ishikawa O. Skin Sclerosis with Elevation of Serum Interleukin-6 That Is Possibly Associated with Immunoglobulin 4-Related Disease. Ann Dermatol 2014; 26:766-7. [PMID: 25473236 PMCID: PMC4252681 DOI: 10.5021/ad.2014.26.6.766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2013] [Revised: 11/13/2013] [Accepted: 11/17/2013] [Indexed: 11/08/2022] Open
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Hattori T, Uchiyama A, Tago O, Nagai Y, Ishikawa O. A case of rapidly progressive, fatal mycosis fungoides presenting as a haematoma-like lesion. Acta Derm Venereol 2013; 93:707-10. [PMID: 23493993 DOI: 10.2340/00015555-1586] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Mycosis fungoides usually follows an indolent clinical course. We report here a rapidly progressive case of mycosis fungoides with peculiar clinical and histological features, presenting as a haematoma-like mass on the thigh accompanied by multiple reddish brown erythematous lesions on the trunk and extremities. Histopathologically, the erythematous lesions showed epidermotropism of atypical T lymphocytes expressing CD4 and prominent syringotropism without syringometaplasia. The haematoma-like lesion consisted of diffuse and dense infiltrates of medium-to-large-sized pleomorphic lymphocytic cells expressing CD30, suggesting that CD30+ large-cell transformation had occurred. Mycosis fungoides presenting as a haematoma-like lesion is rare and may be a poor prognostic sign.
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Horita Y, Arihara F, Hirai S, Shimatani A, Matsuda K, Matsuda M, Sakai A, Uchiyama A, Ishizawa S, Noda Y. Relationship Between HER2 Expression and AFP Production in Gastric Cancer. Ann Oncol 2013. [DOI: 10.1093/annonc/mdt459.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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118
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Odate S, Onishi H, Nakamura K, Kojima M, Uchiyama A, Kato M, Katano M. Tropomyosin-related kinase B inhibitor has potential for tumor regression and relapse prevention in pulmonary large cell neuroendocrine carcinoma. Anticancer Res 2013; 33:3699-3703. [PMID: 24023298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Large cell neuroendocrine carcinoma (LCNEC) has an especially poor prognosis, and an effective therapeutic strategy has yet to be established. We have previously shown that the expressions of tropomyosin-related kinase B (TRKB) and brain-derived neurotrophic factor (BDNF) are high in LCNEC and that TRKB/BDNF signaling is involved in the proliferation, tumorigenesis, and invasive nature of LCNEC. Therefore, TRKB/BDNF signaling may offer a potential therapeutic target for LCNEC treatment. In the present study, we evaluated whether the TRKB tyrosine kinase inhibitor, k252a, has effects on tumor regression and relapse prevention on LCNEC, using a murine xenograft model. The LCNEC cell line and NCI-H810 cells were subcutaneously implanted into the flanks or intrathoracically injected into the bilateral pleural cavities of BALB/c nude mice. k252a significantly inhibited tumor volume, expression of matrix metalloproteinases and the formation of pleural dissemination by LCNEC. These results suggest that k252a has potential for tumor regression and relapse prevention in LCNEC. Since many patients with LCNEC suffer through the use of ineffective therapeutic strategies, a clinical trial using the TRKB inhibitor for LCNEC is urgently required.
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Noshiro H, Urata M, Ikeda O, Iwasaki H, Nabae T, Uchiyama A, Nagai E, Tanaka M. Triangulating stapling technique for esophagogastrostomy after minimally invasive esophagectomy. Surgery 2013; 154:604-10. [PMID: 23859308 DOI: 10.1016/j.surg.2013.04.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Accepted: 04/03/2013] [Indexed: 12/16/2022]
Abstract
BACKGROUND The triangulating stapling technique is one of the reconstruction methods used that provides favorable surgical outcomes in several areas of the digestive tract. However, the results in the cervical esophagogastric anastomosis are not well documented. METHODS Using a prospectively maintained comprehensive database, we reviewed the surgical results of 160 consecutive patients who underwent minimally invasive esophagectomy followed by cervical triangulating stapling esophagogastrostomy during 2 periods from May 2002 to May 2012 so as to determine the efficacy of the triangulating stapling technique using 2 different types of stapling devices. RESULTS The rates of anastomotic leakage and stricture in this series were low (1% and 15%, respectively). The rate of anastomotic stricture was significantly reduced when a linear stapler with a cutting knife was used (9%). A logistic regression analysis showed a reduction of anastomotic stricture to be significantly associated with the use of only a linear stapler with a cutting knife. CONCLUSION Cervical esophagogastric anastomosis by the triangulating stapling technique is safe and feasible. We consider a linear stapling device equipped with a cutting knife to be more suitable for performing the triangulating stapling technique.
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Odate S, Nakamura K, Onishi H, Kojima M, Uchiyama A, Nakano K, Kato M, Tanaka M, Katano M. TrkB/BDNF signaling pathway is a potential therapeutic target for pulmonary large cell neuroendocrine carcinoma. Lung Cancer 2013; 79:205-14. [DOI: 10.1016/j.lungcan.2012.12.004] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2012] [Revised: 11/29/2012] [Accepted: 12/01/2012] [Indexed: 10/27/2022]
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121
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Uchiyama A, Yamada K, Okada E, Nagai Y, Ogino S, Takeuchi Y, Udey MC, Ishikawa O, Motegi SI. Role of MFG-E8 in skin wound healing. J Dermatol Sci 2013. [DOI: 10.1016/j.jdermsci.2012.11.482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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122
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Odate S, Nakamura K, Onishi H, Uchiyama A, Kato M, Tanaka M, Katano M. Tropomyosin-Related Kinase B is a Therapeutic Target and Prognostic Factor for Aggressive Lung Cancer Including Lcnec. Ann Oncol 2012. [DOI: 10.1016/s0923-7534(20)32752-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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123
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Hiramatsu K, Sakata H, Horita Y, Orita N, Kida A, Mizukami A, Miyazawa M, Hirai S, Shimatani A, Matsuda K, Matsuda M, Ogino H, Fujinaga H, Terada I, Shimizu K, Uchiyama A, Ishizawa S, Abo H, Demachi H, Noda Y. Mesenteric phlebosclerosis associated with long-term oral intake of geniposide, an ingredient of herbal medicine. Aliment Pharmacol Ther 2012; 36:575-86. [PMID: 22817400 DOI: 10.1111/j.1365-2036.2012.05221.x] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/23/2012] [Revised: 06/27/2012] [Accepted: 06/29/2012] [Indexed: 01/13/2023]
Abstract
BACKGROUND Idiopathic mesenteric phlebosclerosis (IMP) is a rare disease, characterised by thickening of the wall of the right hemicolon with calcification of mesenteric veins. However, the aetiology remains unknown. AIM To investigate the possible association of herbal medicines with IMP. METHOD The clinical data of four of our own patients were collected. Furthermore, we searched for previous reports about similar patients with detailed descriptions of herbal prescriptions that they had taken. We compared herbal ingredients to identify the toxic agent as a possible aetiological factor. RESULTS Clinical data on a total of 25 patients were summarised. Mean age was 61.8 years and there was female predominance (6 men and 19 women). The used Kampo prescription, the number of cases, and the mean duration of use were as follows: kamisyoyosan in 12 cases for 12.8 years, inshin-iseihaito in 5 cases for 13.4 years, orengedokuto in 4 cases for 14.3 years, inchinkoto in 1 case for 20 years, kamikihitou in 1 case for 19 years, seijobofuto in 1 case for 10 years and gorinsan in 1 case for an unknown duration. Only one ingredient, sansisi, was common to the herbal medicines of all 25 patients. This crude drug called geniposide in English is a major constituent of the Gardenia fruits. CONCLUSION The long-term use of geniposide in herbal medicines appears to be associated with mesenteric phlebosclerosis.
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Higurashi Y, Ohnishi J, Nakagawa T, Haba H, Tamura M, Aihara T, Fujimaki M, Komiyama M, Uchiyama A, Kamigaito O. Production of a highly charged uranium ion beam with RIKEN superconducting electron cyclotron resonance ion source. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:02A333. [PMID: 22380180 DOI: 10.1063/1.3671743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A highly charged uranium (U) ion beam is produced from the RIKEN superconducting electron cyclotron resonance ion source using 18 and 28 GHz microwaves. The sputtering method is used to produce this U ion beam. The beam intensity is strongly dependent on the rod position and sputtering voltage. We observe that the emittance of U(35+) for 28 GHz microwaves is almost the same as that for 18 GHz microwaves. It seems that the beam intensity of U ions produced using 28 GHz microwaves is higher than that produced using 18 GHz microwaves at the same Radio Frequency (RF) power.
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Higurashi Y, Ohnishi J, Nakagawa T, Haba H, Tamura M, Aihara T, Fujimaki M, Komiyama M, Uchiyama A, Kamigaito O. Results of RIKEN superconducting electron cyclotron resonance ion source with 28 GHz. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:02A308. [PMID: 22380155 DOI: 10.1063/1.3660821] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We measured the beam intensity of highly charged heavy ions and x-ray heat load for RIKEN superconducting electron cyclotron resonance ion source with 28 GHz microwaves under the various conditions. The beam intensity of Xe(20+) became maximum at B(min) ∼ 0.65 T, which was ∼65% of the magnetic field strength of electron cyclotron resonance (B(ECR)) for 28 GHz microwaves. We observed that the heat load of x-ray increased with decreasing gas pressure and field gradient at resonance zone. It seems that the beam intensity of highly charged heavy ions with 28 GHz is higher than that with 18 GHz at same RF power.
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