1
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Denham P, Yang Y, Guo V, Fisher A, Shen X, Xu T, England RJ, Li RK, Musumeci P. High energy electron diffraction instrument with tunable camera length. Struct Dyn 2024; 11:024302. [PMID: 38532924 PMCID: PMC10965247 DOI: 10.1063/4.0000240] [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] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 03/04/2024] [Indexed: 03/28/2024]
Abstract
Ultrafast electron diffraction (UED) stands as a powerful technique for real-time observation of structural dynamics at the atomic level. In recent years, the use of MeV electrons from radio frequency guns has been widely adopted to take advantage of the relativistic suppression of the space charge effects that otherwise limit the temporal resolution of the technique. Nevertheless, there is not a clear choice for the optimal energy for a UED instrument. Scaling to beam energies higher than a few MeV does pose significant technical challenges, mainly related to the inherent increase in diffraction camera length associated with the smaller Bragg angles. In this study, we report a solution by using a compact post-sample magnetic optical system to magnify the diffraction pattern from a crystal Au sample illuminated by an 8.2 MeV electron beam. Our method employs, as one of the lenses of the optical system, a triplet of compact, high field gradients (>500 T/m), small-gap (3.5 mm) Halbach permanent magnet quadrupoles. Shifting the relative position of the quadrupoles, we demonstrate tuning the magnification by more than a factor of two, a 6× improvement in camera length, and reciprocal space resolution better than 0.1 Å-1 in agreement with beam transport simulations.
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Affiliation(s)
- P. Denham
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - Y. Yang
- Department of Engineering Physics, Tsinghua University, Beijing 100084, China
| | - V. Guo
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - A. Fisher
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - X. Shen
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - T. Xu
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - R. J. England
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - R. K. Li
- Department of Engineering Physics, Tsinghua University, Beijing 100084, China
| | - P. Musumeci
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
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2
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Deng XJ, Zhang Y, Pan ZL, Li ZZ, Bian JH, Tsai CY, Li RK, Chao AW, Huang WH, Tang CX. Average and statistical properties of coherent radiation from steady-state microbunching. J Synchrotron Radiat 2023; 30:35-50. [PMID: 36601924 PMCID: PMC9814053 DOI: 10.1107/s1600577522009973] [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] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 10/12/2022] [Indexed: 06/17/2023]
Abstract
A promising accelerator light source mechanism called steady-state microbunching (SSMB) is being actively studied. With the combination of strong coherent radiation from microbunching and high repetition rate of a storage ring, high-average-power narrow-band radiation can be anticipated from an SSMB storage ring, with wavelengths ranging from THz to soft X-ray. Such a novel light source could provide new opportunities for accelerator photon science like high-resolution angle-resolved photoemission spectroscopy and industrial applications like extreme ultraviolet (EUV) lithography. In this paper, a theoretical and numerical study of the average and statistical properties of coherent radiation from SSMB are presented. The results show that 1 kW average-power quasi-continuous-wave EUV radiation can be obtained from an SSMB ring provided that an average current of 1 A and a microbunch train with bunch length of 3 nm can be formed at the radiator which is assumed to be an undulator. Together with the narrow-band feature, the EUV photon flux can reach 6 × 1015 photons s-1 within a 0.1 meV energy bandwidth, which is three orders of magnitude higher than that in a conventional synchrotron source and is appealing for fundamental condensed matter physics and other research. In this theoretical investigation, we have generalized the definition and derivation of the transverse form factor of an electron beam which can quantify the impact of its transverse size on coherent radiation. In particular, it has been shown that the narrow-band feature of SSMB radiation is strongly correlated with the finite transverse electron beam size. Considering the pointlike nature of electrons and quantum nature of radiation, the coherent radiation fluctuates from microbunch to microbunch, or for a single microbunch from turn to turn. Some important results concerning the statistical properties of SSMB radiation are presented, with a brief discussion on its potential applications, for example the beam diagnostics. The presented work is of value for the development of SSMB to better serve potential synchrotron radiation users. In addition, this also sheds light on understanding the radiation characteristics of free-electron lasers, coherent harmonic generation, etc.
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Affiliation(s)
- X. J. Deng
- Department of Engineering Physics, Tsinghua University, Beijing 100084, People’s Republic of China
| | - Y. Zhang
- Department of Engineering Physics, Tsinghua University, Beijing 100084, People’s Republic of China
| | - Z. L. Pan
- Department of Engineering Physics, Tsinghua University, Beijing 100084, People’s Republic of China
| | - Z. Z. Li
- Department of Engineering Physics, Tsinghua University, Beijing 100084, People’s Republic of China
| | - J. H. Bian
- Department of Engineering Physics, Tsinghua University, Beijing 100084, People’s Republic of China
| | - C.-Y. Tsai
- School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China
| | - R. K. Li
- Department of Engineering Physics, Tsinghua University, Beijing 100084, People’s Republic of China
| | - A. W. Chao
- Institute for Advanced Study, Tsinghua University, Beijing 100084, People’s Republic of China
- Stanford University, Stanford, CA 94309, USA
| | - W. H. Huang
- Department of Engineering Physics, Tsinghua University, Beijing 100084, People’s Republic of China
| | - C. X. Tang
- Department of Engineering Physics, Tsinghua University, Beijing 100084, People’s Republic of China
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3
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Abstract
Standardized hepatocellular carcinoma (HCC) screening is very important for early diagnosis. Chinese and international HCC clinical guidelines recommend regular ultrasound screening for high-risk patients. Noninvasive dynamic enhanced imaging technology should be selected for the positive screenin population to get the further diagnosis, including contrast-enhanced ultrasound (CEUS), dynamic contrast-enhanced CT, dynamic contrast-enhanced MRI and Gd-EOB-DTPA enhanced MRI (EOB MRI). In clinical practice, early diagnose of HCC relies on accurate identification and stratification of high-risk patients, and systematic approach based on dynamic contrast-enhanced imaging.
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Affiliation(s)
- X P Ren
- Department of Ultrasound, Ruijin Hospital Radiology, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - R K Li
- Departmen Affiliated to Medical College, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
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4
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Malin LE, Graves WS, Holl M, Spence JCH, Nanni EA, Li RK, Shen X, Weathersby S. Quantitative agreement between dynamical rocking curves in ultrafast electron diffraction for x-ray lasers. Ultramicroscopy 2021; 223:113211. [PMID: 33582644 DOI: 10.1016/j.ultramic.2021.113211] [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: 09/07/2020] [Revised: 12/28/2020] [Accepted: 01/14/2021] [Indexed: 11/16/2022]
Abstract
Electron diffraction through a thin patterned silicon membrane can be used to create complex spatial modulations in electron distributions. By precisely varying parameters such as crystallographic orientation and wafer thickness, the intensity of reflections in the diffraction plane can be controlled and by placing an aperture to block all but one spot, we can form an image with different parts of the patterned membrane, as is done for bright-field imaging in microscopy. The patterned electron beams can then be used to control phase and amplitude of subsequent x-ray emission, enabling novel coherent x-ray methods. The electrons themselves can also be used for femtosecond time resolved diffraction and microscopy. As a first step toward patterned beams, we demonstrate experimentally and through simulation the ability to accurately predict and control diffraction spot intensities. We simulate MeV transmission electron diffraction patterns using the multislice method for various crystallographic orientations of a single crystal Si(001) membrane near beam normal. The resulting intensity maps of the Bragg reflections are compared to experimental results obtained at the Accelerator Structure Test Area Ultrafast Electron Diffraction (ASTA UED) facility at SLAC. Furthermore, the fraction of inelastic and elastic scattering of the initial charge is estimated along with the absorption of the membrane to determine the contrast that would be seen in a patterned version of the Si(001) membrane.
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Affiliation(s)
- L E Malin
- Department of Physics, Arizona State University, Tempe, AZ 85287, USA.
| | - W S Graves
- Department of Physics, Arizona State University, Tempe, AZ 85287, USA
| | - M Holl
- Department of Physics, Arizona State University, Tempe, AZ 85287, USA
| | - J C H Spence
- Department of Physics, Arizona State University, Tempe, AZ 85287, USA
| | - E A Nanni
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - R K Li
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - X Shen
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - S Weathersby
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
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5
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Snively EC, Othman MAK, Kozina M, Ofori-Okai BK, Weathersby SP, Park S, Shen X, Wang XJ, Hoffmann MC, Li RK, Nanni EA. Femtosecond Compression Dynamics and Timing Jitter Suppression in a THz-driven Electron Bunch Compressor. Phys Rev Lett 2020; 124:054801. [PMID: 32083908 DOI: 10.1103/physrevlett.124.054801] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Revised: 12/30/2019] [Accepted: 01/08/2020] [Indexed: 05/07/2023]
Abstract
We present the first demonstration of THz driven bunch compression and timing stabilization of a relativistic electron beam. Quasi-single-cycle strong field THz radiation is used in a shorted parallel-plate structure to compress a few-fC beam with 2.5 MeV kinetic energy by a factor of 2.7, producing a 39 fs rms bunch length and a reduction in timing jitter by more than a factor of 2 to 31 fs rms. This THz driven technique offers a significant improvement to beam performance for applications like ultrafast electron diffraction, providing a critical step towards unprecedented timing resolution in ultrafast sciences, and other accelerator applications using femtosecond-scale electron beams.
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Affiliation(s)
- E C Snively
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M A K Othman
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M Kozina
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - B K Ofori-Okai
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - S P Weathersby
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - S Park
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - X Shen
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - X J Wang
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M C Hoffmann
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R K Li
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - E A Nanni
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
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6
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Shen X, Nunes JPF, Yang J, Jobe RK, Li RK, Lin MF, Moore B, Niebuhr M, Weathersby SP, Wolf TJA, Yoneda C, Guehr M, Centurion M, Wang XJ. Femtosecond gas-phase mega-electron-volt ultrafast electron diffraction. Struct Dyn 2019; 6:054305. [PMID: 31649964 PMCID: PMC6796191 DOI: 10.1063/1.5120864] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 09/24/2019] [Indexed: 05/16/2023]
Abstract
The development of ultrafast gas electron diffraction with nonrelativistic electrons has enabled the determination of molecular structures with atomic spatial resolution. It has, however, been challenging to break the picosecond temporal resolution barrier and achieve the goal that has long been envisioned-making space- and-time resolved molecular movies of chemical reaction in the gas-phase. Recently, an ultrafast electron diffraction (UED) apparatus using mega-electron-volt (MeV) electrons was developed at the SLAC National Accelerator Laboratory for imaging ultrafast structural dynamics of molecules in the gas phase. The SLAC gas-phase MeV UED has achieved 65 fs root mean square temporal resolution, 0.63 Å spatial resolution, and 0.22 Å-1 reciprocal-space resolution. Such high spatial-temporal resolution has enabled the capturing of real-time molecular movies of fundamental photochemical mechanisms, such as chemical bond breaking, ring opening, and a nuclear wave packet crossing a conical intersection. In this paper, the design that enables the high spatial-temporal resolution of the SLAC gas phase MeV UED is presented. The compact design of the differential pump section of the SLAC gas phase MeV UED realized five orders-of-magnitude vacuum isolation between the electron source and gas sample chamber. The spatial resolution, temporal resolution, and long-term stability of the apparatus are systematically characterized.
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Affiliation(s)
- X. Shen
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J. P. F. Nunes
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | | | - R. K. Jobe
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R. K. Li
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - Ming-Fu Lin
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - B. Moore
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - M. Niebuhr
- Institut für Physik und Astronomie, Universität Potsdam, 14476 Potsdam, Germany
| | - S. P. Weathersby
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - T. J. A. Wolf
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - C. Yoneda
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - Markus Guehr
- Institut für Physik und Astronomie, Universität Potsdam, 14476 Potsdam, Germany
| | - Martin Centurion
- Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
| | - X. J. Wang
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
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7
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Othman MAK, Hoffmann MC, Kozina ME, Wang XJ, Li RK, Nanni EA. Parallel-plate waveguides for terahertz-driven MeV electron bunch compression. Opt Express 2019; 27:23791-23800. [PMID: 31510279 DOI: 10.1364/oe.27.023791] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Accepted: 07/29/2019] [Indexed: 06/10/2023]
Abstract
We demonstrate the electromagnetic performance of waveguides for femtosecond electron beam bunch manipulation and compression with strong-field terahertz (THz) pulses. The compressor structure is a dispersion-free exponentially-tapered parallel-plate waveguide (PPWG) that can focus single-cycle THz pulses along one dimension. We show test results of the tapered PPWG structure using electro-optic sampling (EOS) at the interaction region with peak fields of at least 300 kV/cm, given 0.9 µJ of incoming THz energy. We also present a modified shorted design of the tapered PPWG for better beam manipulation and reduced magnetic field as an alternative to a dual-feed approach. As an example, we demonstrate that with 5 µJ of THz energy, the PPWG compresses a 2.5 MeV electron bunch by a compression factor of more than 4, achieving a bunch length of about 18 fs.
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8
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Esteva FJ, Baranau YV, Baryash V, Manikhas A, Moiseyenko V, Dzagnidze G, Zhavrid E, Boliukh D, Stroyakovskiy D, Pikiel J, Eniu AE, Li RK, Rusyn AV, Tiangco B, Lee SJ, Lee SY, Yu SY, Stebbing J. Efficacy and safety of CT-P6 versus reference trastuzumab in HER2-positive early breast cancer: updated results of a randomised phase 3 trial. Cancer Chemother Pharmacol 2019; 84:839-847. [PMID: 31428820 PMCID: PMC6768896 DOI: 10.1007/s00280-019-03920-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Accepted: 07/30/2019] [Indexed: 12/12/2022]
Abstract
PURPOSE Neoadjuvant CT-P6, a trastuzumab biosimilar, demonstrated equivalent efficacy to reference trastuzumab in a phase 3 trial of HER2-positive early-stage breast cancer (EBC) (NCT02162667). We report post hoc analyses evaluating pathological complete response (pCR) and breast pCR alongside additional efficacy and safety measures. METHODS Following neoadjuvant treatment and surgery, patients received adjuvant CT-P6 or trastuzumab (6 mg/kg) every 3 weeks for ≤ 1 year. RESULTS In total, 271 and 278 patients received CT-P6 and trastuzumab, respectively. pCR and breast pCR rates were comparable between treatment groups regardless of age, region, or clinical stage. Overall, 47.6% (CT-P6) and 52.2% (trastuzumab) of patients experienced study drug-related treatment-emergent adverse events (TEAEs), including 17 patients reporting heart failure (CT-P6: 10; trastuzumab: 7). Two CT-P6 and three trastuzumab patients discontinued adjuvant treatment due to TEAEs. CONCLUSION Adjuvant CT-P6 demonstrated comparable efficacy and safety to trastuzumab at 1 year in patients with HER2-positive EBC, supporting CT-P6 and trastuzumab comparability.
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Affiliation(s)
- F J Esteva
- Perlmutter Cancer Center, NYU Langone Health, 160 E 34th Street, New York, 10016, USA.,New York University Langone Medical Center, 550 1st Avenue, New York, 10016, USA
| | - Y V Baranau
- Department of Oncology, Belarusian State Medical University, 220013, Minsk, Belarus
| | - V Baryash
- Department of Oncology, Belarusian State Medical University, 220013, Minsk, Belarus
| | - A Manikhas
- City Clinical Oncology Dispensary, Saint Petersburg, 198255, Russian Federation
| | - V Moiseyenko
- GBUZ Saint Petersburg Clinical Research Center of Specialised Types of Care (Oncology), Saint Petersburg, 197758, Russian Federation
| | - G Dzagnidze
- S. Khechinashvili University Clinic, Ltd, 0177, Tbilisi, Georgia
| | - E Zhavrid
- N.N. Alexandrov National Cancer Centre of Belarus, 223040, Minsk Region, Belarus
| | - D Boliukh
- Vinnytsya Regional Clinical Oncology Dispensary, Vinnytsia, 21029, Ukraine
| | - D Stroyakovskiy
- Moscow City Oncology Hospital, Moscow, 143423, Russian Federation
| | - J Pikiel
- Wojewodzkie Centrum Onkologii, 80-219, Gdańsk, Poland
| | - A E Eniu
- Cancer Institute "Ion Chiricuta", 400015, Cluj-Napoca, Romania
| | - R K Li
- St. Luke's Medical Center, 1102, Quezon City, Philippines
| | - A V Rusyn
- Transcarpathian Regional Clinical Oncology Dispensary, Transcarpathian, 88000, Ukraine
| | - B Tiangco
- The Medical City, Ortigas Avenue, Pasig City, Philippines
| | - S J Lee
- CELLTRION, Inc., Incheon, 22014, Republic of Korea
| | - S Young Lee
- CELLTRION, Inc., Incheon, 22014, Republic of Korea
| | - S Y Yu
- CELLTRION, Inc., Incheon, 22014, Republic of Korea
| | - J Stebbing
- Division of Cancer, Imperial Centre for Translational and Experimental Medicine, Du Cane Road, London, W12 0HS, UK. .,Imperial College Healthcare NHS Trust, Charing Cross Hospital, Fulham Palace Road, London, W6 8RF, UK.
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9
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Sannibale F, Filippetto D, Qian H, Mitchell C, Zhou F, Vecchione T, Li RK, Gierman S, Schmerge J. High-brightness beam tests of the very high frequency gun at the Advanced Photo-injector EXperiment test facility at the Lawrence Berkeley National Laboratory. Rev Sci Instrum 2019; 90:033304. [PMID: 30927765 DOI: 10.1063/1.5088521] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 02/24/2019] [Indexed: 06/09/2023]
Abstract
The very-high-frequency gun (VHF-Gun) is a new concept photo-injector developed and built at the Lawrence Berkeley National Laboratory (LBNL) for generating high-brightness electron beams capable of driving X-ray free electron lasers (FELs) at MHz-class repetition rates. The gun that purposely uses established and mature radiofrequency and mechanical technologies has demonstrated over the last many years the capability of reliably operating in continuous wave mode at the design accelerating fields and required vacuum and mechanical performance. The results of VHF-Gun technology demonstration were reported elsewhere [Sannibale et al., Phys. Rev. Spec. Top.-Accel. Beams 15, 103501 (2012)]; here in this paper, we provide and analyze examples of the experimental results of the first high-brightness beam tests performed at the Advanced Photo-injector EXperiment test facility at LBNL that demonstrated the gun capability of delivering the beam quality required for driving high repetition rate X-ray FELs.
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Affiliation(s)
- F Sannibale
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - D Filippetto
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - H Qian
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - C Mitchell
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - F Zhou
- SLAC, Menlo Park, California 94025, USA
| | | | - R K Li
- SLAC, Menlo Park, California 94025, USA
| | - S Gierman
- SLAC, Menlo Park, California 94025, USA
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10
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Mo MZ, Becker V, Ofori-Okai BK, Shen X, Chen Z, Witte B, Redmer R, Li RK, Dunning M, Weathersby SP, Wang XJ, Glenzer SH. Determination of the electron-lattice coupling strength of copper with ultrafast MeV electron diffraction. Rev Sci Instrum 2018; 89:10C108. [PMID: 30399817 DOI: 10.1063/1.5035368] [Citation(s) in RCA: 2] [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: 04/14/2018] [Accepted: 08/06/2018] [Indexed: 06/08/2023]
Abstract
Electron-lattice coupling strength governs the energy transfer between electrons and the lattice and is important for understanding the material behavior under highly non-equilibrium conditions. Here we report the results of employing time-resolved electron diffraction at MeV energies to directly study the electron-lattice coupling strength in 40-nm-thick polycrystalline copper excited by femtosecond optical lasers. The temporal evolution of lattice temperature at various pump fluence conditions were obtained from the measurements of the Debye-Waller decay of multiple diffraction peaks. We observed the temperature dependence of the electron-lattice relaxation time which is a result of the temperature dependence of electron heat capacity. Comparison with two-temperature model simulations reveals an electron-lattice coupling strength of (0.9 ± 0.1) × 1017 W/m3/K for copper.
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Affiliation(s)
- M Z Mo
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - V Becker
- Department of Physics, Southern Illinois University Edwardsville, Edwardsville, Illinois 62026, USA
| | - B K Ofori-Okai
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - X Shen
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - Z Chen
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - B Witte
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R Redmer
- Institut für Physik, Universität Rostock, 18051 Rostock, Germany
| | - R K Li
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M Dunning
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - S P Weathersby
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - X J Wang
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - S H Glenzer
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
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11
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Mo MZ, Chen Z, Li RK, Dunning M, Witte BBL, Baldwin JK, Fletcher LB, Kim JB, Ng A, Redmer R, Reid AH, Shekhar P, Shen XZ, Shen M, Sokolowski-Tinten K, Tsui YY, Wang YQ, Zheng Q, Wang XJ, Glenzer SH. Heterogeneous to homogeneous melting transition visualized with ultrafast electron diffraction. Science 2018; 360:1451-1455. [PMID: 29954977 DOI: 10.1126/science.aar2058] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Accepted: 05/01/2018] [Indexed: 11/02/2022]
Abstract
The ultrafast laser excitation of matters leads to nonequilibrium states with complex solid-liquid phase-transition dynamics. We used electron diffraction at mega-electron volt energies to visualize the ultrafast melting of gold on the atomic scale length. For energy densities approaching the irreversible melting regime, we first observed heterogeneous melting on time scales of 100 to 1000 picoseconds, transitioning to homogeneous melting that occurs catastrophically within 10 to 20 picoseconds at higher energy densities. We showed evidence for the heterogeneous coexistence of solid and liquid. We determined the ion and electron temperature evolution and found superheated conditions. Our results constrain the electron-ion coupling rate, determine the Debye temperature, and reveal the melting sensitivity to nucleation seeds.
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Affiliation(s)
- M Z Mo
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
| | - Z Chen
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - R K Li
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - M Dunning
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - B B L Witte
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.,Institut für Physik, Universität Rostock, 18051 Rostock, Germany
| | - J K Baldwin
- Los Alamos National Laboratory, Bikini Atoll Road, Los Alamos, NM 87545, USA
| | - L B Fletcher
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - J B Kim
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - A Ng
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - R Redmer
- Institut für Physik, Universität Rostock, 18051 Rostock, Germany
| | - A H Reid
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - P Shekhar
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB T6G 2V4, Canada
| | - X Z Shen
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - M Shen
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB T6G 2V4, Canada
| | - K Sokolowski-Tinten
- Faculty of Physics and Centre for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Lotharstrasse 1, D-47048 Duisburg, Germany
| | - Y Y Tsui
- Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB T6G 2V4, Canada
| | - Y Q Wang
- Los Alamos National Laboratory, Bikini Atoll Road, Los Alamos, NM 87545, USA
| | - Q Zheng
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - X J Wang
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
| | - S H Glenzer
- SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
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12
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Reid AH, Shen X, Maldonado P, Chase T, Jal E, Granitzka PW, Carva K, Li RK, Li J, Wu L, Vecchione T, Liu T, Chen Z, Higley DJ, Hartmann N, Coffee R, Wu J, Dakovski GL, Schlotter WF, Ohldag H, Takahashi YK, Mehta V, Hellwig O, Fry A, Zhu Y, Cao J, Fullerton EE, Stöhr J, Oppeneer PM, Wang XJ, Dürr HA. Beyond a phenomenological description of magnetostriction. Nat Commun 2018; 9:388. [PMID: 29374151 PMCID: PMC5786062 DOI: 10.1038/s41467-017-02730-7] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Accepted: 12/19/2017] [Indexed: 11/10/2022] Open
Abstract
Magnetostriction, the strain induced by a change in magnetization, is a universal effect in magnetic materials. Owing to the difficulty in unraveling its microscopic origin, it has been largely treated phenomenologically. Here, we show how the source of magnetostriction-the underlying magnetoelastic stress-can be separated in the time domain, opening the door for an atomistic understanding. X-ray and electron diffraction are used to separate the sub-picosecond spin and lattice responses of FePt nanoparticles. Following excitation with a 50-fs laser pulse, time-resolved X-ray diffraction demonstrates that magnetic order is lost within the nanoparticles with a time constant of 146 fs. Ultrafast electron diffraction reveals that this demagnetization is followed by an anisotropic, three-dimensional lattice motion. Analysis of the size, speed, and symmetry of the lattice motion, together with ab initio calculations accounting for the stresses due to electrons and phonons, allow us to reveal the magnetoelastic stress generated by demagnetization.
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Affiliation(s)
- A H Reid
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA. .,Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.
| | - X Shen
- Accelerator Division, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - P Maldonado
- Department of Physics and Astronomy, Uppsala University, P. O. Box 516, S-75120, Uppsala, Sweden
| | - T Chase
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.,Department of Applied Physics, Stanford University, Stanford, CA, 94305, USA
| | - E Jal
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.,CNRS, Laboratoire de Chimie Physique - Matière et Rayonnement, Sorbonne Universités, UPMC Univ. Paris 06, 75005, Paris, France
| | - P W Granitzka
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.,Van der Waals-Zeeman Institute, University of Amsterdam, 1018XE, Amsterdam, The Netherlands
| | - K Carva
- Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Charles University, Ke Karlovu 5, CZ-12116, Prague 2, Czech Republic
| | - R K Li
- Accelerator Division, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - J Li
- Brookhaven National Laboratory, Upton, NY, 1193, USA
| | - L Wu
- Brookhaven National Laboratory, Upton, NY, 1193, USA
| | - T Vecchione
- Accelerator Division, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - T Liu
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.,Department of Physics, Stanford University, Stanford, CA, 94305, USA
| | - Z Chen
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.,Department of Physics, Stanford University, Stanford, CA, 94305, USA
| | - D J Higley
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA.,Department of Applied Physics, Stanford University, Stanford, CA, 94305, USA
| | - N Hartmann
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - R Coffee
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - J Wu
- Accelerator Division, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - G L Dakovski
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - W F Schlotter
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - H Ohldag
- Stanford Synchrotron Radiation Laboratory, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - Y K Takahashi
- Magnetic Materials Unit, National Institute for Materials Science, Tsukuba, 305-0047, Japan
| | - V Mehta
- San Jose Research Center, HGST a Western Digital Company, 3403 Yerba Buena Road, San Jose, CA, 95135, USA.,Thomas J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, NY, 10598, USA
| | - O Hellwig
- San Jose Research Center, HGST a Western Digital Company, 3403 Yerba Buena Road, San Jose, CA, 95135, USA.,Institute of Physics, Technische Universität Chemnitz, Reichenhainer Straße 70, D-09107, Chemnitz, Germany.,Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany
| | - A Fry
- Linac Coherent Light Source, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - Y Zhu
- Brookhaven National Laboratory, Upton, NY, 1193, USA
| | - J Cao
- Department of Physics and National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, 32310, USA
| | - E E Fullerton
- Center for Memory and Recording Research, UC San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0401, USA
| | - J Stöhr
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - P M Oppeneer
- Department of Physics and Astronomy, Uppsala University, P. O. Box 516, S-75120, Uppsala, Sweden
| | - X J Wang
- Accelerator Division, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA
| | - H A Dürr
- Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA, 94025, USA. .,Department of Physics and Astronomy, Uppsala University, P. O. Box 516, S-75120, Uppsala, Sweden.
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13
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Sokolowski-Tinten K, Shen X, Zheng Q, Chase T, Coffee R, Jerman M, Li RK, Ligges M, Makasyuk I, Mo M, Reid AH, Rethfeld B, Vecchione T, Weathersby SP, Dürr HA, Wang XJ. Electron-lattice energy relaxation in laser-excited thin-film Au-insulator heterostructures studied by ultrafast MeV electron diffraction. Struct Dyn 2017; 4:054501. [PMID: 28795080 PMCID: PMC5522339 DOI: 10.1063/1.4995258] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 07/10/2017] [Indexed: 05/19/2023]
Abstract
We apply time-resolved MeV electron diffraction to study the electron-lattice energy relaxation in thin film Au-insulator heterostructures. Through precise measurements of the transient Debye-Waller-factor, the mean-square atomic displacement is directly determined, which allows to quantitatively follow the temporal evolution of the lattice temperature after short pulse laser excitation. Data obtained over an extended range of laser fluences reveal an increased relaxation rate when the film thickness is reduced or the Au-film is capped with an additional insulator top-layer. This behavior is attributed to a cross-interfacial coupling of excited electrons in the Au film to phonons in the adjacent insulator layer(s). Analysis of the data using the two-temperature-model taking explicitly into account the additional energy loss at the interface(s) allows to deduce the relative strength of the two relaxation channels.
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Affiliation(s)
- K Sokolowski-Tinten
- Faculty of Physics and Centre for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Lotharstrasse 1, 47048 Duisburg, Germany
| | - X Shen
- SLAC National Accelerator Laboratory, 2575 Sand Hill Rd., Menlo Park, California 94025, USA
| | - Q Zheng
- School of Materials and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, China
| | - T Chase
- SLAC National Accelerator Laboratory, 2575 Sand Hill Rd., Menlo Park, California 94025, USA
| | - R Coffee
- SLAC National Accelerator Laboratory, 2575 Sand Hill Rd., Menlo Park, California 94025, USA
| | - M Jerman
- Faculty of Physics and Centre for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Lotharstrasse 1, 47048 Duisburg, Germany
| | - R K Li
- SLAC National Accelerator Laboratory, 2575 Sand Hill Rd., Menlo Park, California 94025, USA
| | - M Ligges
- Faculty of Physics and Centre for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Lotharstrasse 1, 47048 Duisburg, Germany
| | - I Makasyuk
- SLAC National Accelerator Laboratory, 2575 Sand Hill Rd., Menlo Park, California 94025, USA
| | - M Mo
- SLAC National Accelerator Laboratory, 2575 Sand Hill Rd., Menlo Park, California 94025, USA
| | - A H Reid
- SLAC National Accelerator Laboratory, 2575 Sand Hill Rd., Menlo Park, California 94025, USA
| | - B Rethfeld
- Department of Physics and OPTIMAS Research Center, Technical University Kaiserslautern, Erwin-Schrödinger-Strae 46, 67663 Kaiserslautern, Germany
| | - T Vecchione
- SLAC National Accelerator Laboratory, 2575 Sand Hill Rd., Menlo Park, California 94025, USA
| | - S P Weathersby
- SLAC National Accelerator Laboratory, 2575 Sand Hill Rd., Menlo Park, California 94025, USA
| | - H A Dürr
- SLAC National Accelerator Laboratory, 2575 Sand Hill Rd., Menlo Park, California 94025, USA
| | - X J Wang
- SLAC National Accelerator Laboratory, 2575 Sand Hill Rd., Menlo Park, California 94025, USA
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14
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Shang L, Qin W, Li RK, Lu W, Liu CX, Yu DX, Wang S. [An analysis of the psychological state of patients with chronic liver diseases]. Zhonghua Gan Zang Bing Za Zhi 2017; 25:623-625. [PMID: 29056014 DOI: 10.3760/cma.j.issn.1007-3418.2017.08.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Affiliation(s)
- L Shang
- Huangshi Central Hospital, Huangshi Hubei 435000, China
| | - W Qin
- The Second Affiliated Hospital of Dalian Medical University, Dalian 116023, China
| | - R K Li
- The Second Affiliated Hospital of Dalian Medical University, Dalian 116023, China
| | - W Lu
- The Second Affiliated Hospital of Dalian Medical University, Dalian 116023, China
| | - C X Liu
- The Second Affiliated Hospital of Dalian Medical University, Dalian 116023, China
| | - D X Yu
- The Second Affiliated Hospital of Dalian Medical University, Dalian 116023, China
| | - S Wang
- The Second Affiliated Hospital of Dalian Medical University, Dalian 116023, China
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15
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Xia M, Zhai K, Lu J, Sun Y, Li RK. Orthoborates LiCdRE 5(BO 3) 6 (RE = Sm-Lu and Y) with Rare-Earth Ions on a Triangular Lattice: Synthesis, Crystal Structure, and Optical and Magnetic Properties. Inorg Chem 2017; 56:8100-8105. [PMID: 28661669 DOI: 10.1021/acs.inorgchem.7b00756] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Single crystals of LiCdY5(BO3)6 were successfully grown from a Li2O-B2O3 flux, and its lanthanide homotypic compounds, LiCdRE5(BO3)6 (RE = Sm-Lu), have been prepared by solid-state reaction. They crystallize in the noncentrosymmetric space group P6522 with cell parameters in the ranges of a = 7.0989(2)-6.9337(1) Å and c = 25.9375(1)-24.8960(6) Å. As a representative example, LiCdY5(BO3)6 features a triangular lattice in the ab plane composed of three distinct crystallographic Y sites. The triangular lattices spaced with the same distance of [Formula: see text]c are further stacked to build three-dimensional frameworks by reinforcement of the isolated planar BO3 groups and distorted LiO4 tetrahedra. Magnetic measurements show that Eu and Sm compounds exhibit typical Van Vleck-type paramagnetism and other rare-earth borates show weak antiferromagnetic behavior. In addition, UV-vis-near-IR diffuse-reflectance and photoluminescence spectra were performed to understand the transition energy levels of active rare-earth ions and their relationships to magnetism.
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Affiliation(s)
- Mingjun Xia
- Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190, China
| | - Kun Zhai
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China
| | - Jun Lu
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China
| | - Young Sun
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China
| | - R K Li
- Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190, China
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16
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Le Guyader L, Chase T, Reid AH, Li RK, Svetin D, Shen X, Vecchione T, Wang XJ, Mihailovic D, Dürr HA. Stacking order dynamics in the quasi-two-dimensional dichalcogenide 1 T-TaS 2 probed with MeV ultrafast electron diffraction. Struct Dyn 2017; 4:044020. [PMID: 28503631 PMCID: PMC5415401 DOI: 10.1063/1.4982918] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 04/21/2017] [Indexed: 05/29/2023]
Abstract
Transitions between different charge density wave (CDW) states in quasi-two-dimensional materials may be accompanied also by changes in the inter-layer stacking of the CDW. Using MeV ultrafast electron diffraction, the out-of-plane stacking order dynamics in the quasi-two-dimensional dichalcogenide 1T-TaS2 is investigated for the first time. From the intensity of the CDW satellites aligned around the commensurate l = 1/6 characteristic stacking order, it is found out that this phase disappears with a 0.3 ps time constant. Simultaneously, in the same experiment, the emergence of the incommensurate phase, with a slightly slower 2.0 ps time constant, is determined from the intensity of the CDW satellites aligned around the incommensurate l = 1/3 characteristic stacking order. These results might be of relevance in understanding the metallic character of the laser-induced metastable "hidden" state recently discovered in this compound.
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Affiliation(s)
| | | | - A H Reid
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R K Li
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - D Svetin
- Jozef Stefan Institute and CENN Nanocenter, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - X Shen
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - T Vecchione
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - X J Wang
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - D Mihailovic
- Jozef Stefan Institute and CENN Nanocenter, Jamova 39, SI-1000 Ljubljana, Slovenia
| | - H A Dürr
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
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17
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Zhao J, Islam SM, Kontsevoi OY, Tan G, Stoumpos CC, Chen H, Li RK, Kanatzidis MG. The Two-Dimensional AxCdxBi4–xQ6 (A = K, Rb, Cs; Q = S, Se): Direct Bandgap Semiconductors and Ion-Exchange Materials. J Am Chem Soc 2017; 139:6978-6987. [DOI: 10.1021/jacs.7b02243] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jing Zhao
- Beijing
Center for Crystal Research and Development, Technical Institute of
Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Saiful M. Islam
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Oleg Y. Kontsevoi
- Department of Physics & Astronomy, Northwestern University, Evanston, Illinois 60208, United States
| | - Gangjian Tan
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | | | - Haijie Chen
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - R. K. Li
- Beijing
Center for Crystal Research and Development, Technical Institute of
Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Mercouri G. Kanatzidis
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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18
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Vecchione T, Denes P, Jobe RK, Johnson IJ, Joseph JM, Li RK, Perazzo A, Shen X, Wang XJ, Weathersby SP, Yang J, Zhang D. A direct electron detector for time-resolved MeV electron microscopy. Rev Sci Instrum 2017; 88:033702. [PMID: 28372435 DOI: 10.1063/1.4977923] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The introduction of direct electron detectors enabled the structural biology revolution of cryogenic electron microscopy. Direct electron detectors are now expected to have a similarly dramatic impact on time-resolved MeV electron microscopy, particularly by enabling both spatial and temporal jitter correction. Here we report on the commissioning of a direct electron detector for time-resolved MeV electron microscopy. The direct electron detector demonstrated MeV single electron sensitivity and is capable of recording megapixel images at 180 Hz. The detector has a 15-bit dynamic range, better than 30-μm spatial resolution and less than 20 analogue-to-digital converter count RMS pixel noise. The unique capabilities of the direct electron detector and the data analysis required to take advantage of these capabilities are presented. The technical challenges associated with generating and processing large amounts of data are also discussed.
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Affiliation(s)
- T Vecchione
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - P Denes
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - R K Jobe
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - I J Johnson
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - J M Joseph
- Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - R K Li
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - A Perazzo
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - X Shen
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - X J Wang
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - S P Weathersby
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - J Yang
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - D Zhang
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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19
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Mo MZ, Shen X, Chen Z, Li RK, Dunning M, Sokolowski-Tinten K, Zheng Q, Weathersby SP, Reid AH, Coffee R, Makasyuk I, Edstrom S, McCormick D, Jobe K, Hast C, Glenzer SH, Wang X. Single-shot mega-electronvolt ultrafast electron diffraction for structure dynamic studies of warm dense matter. Rev Sci Instrum 2016; 87:11D810. [PMID: 27910490 DOI: 10.1063/1.4960070] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We have developed a single-shot mega-electronvolt ultrafast-electron-diffraction system to measure the structural dynamics of warm dense matter. The electron probe in this system is featured by a kinetic energy of 3.2 MeV and a total charge of 20 fC, with the FWHM pulse duration and spot size at sample of 350 fs and 120 μm respectively. We demonstrate its unique capability by visualizing the atomic structural changes of warm dense gold formed from a laser-excited 35-nm freestanding single-crystal gold foil. The temporal evolution of the Bragg peak intensity and of the liquid signal during solid-liquid phase transition are quantitatively determined. This experimental capability opens up an exciting opportunity to unravel the atomic dynamics of structural phase transitions in warm dense matter regime.
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Affiliation(s)
- M Z Mo
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - X Shen
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - Z Chen
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R K Li
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M Dunning
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - K Sokolowski-Tinten
- Faculty of Physics and Centre for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Lotharstrasse 1, D-47048 Duisburg, Germany
| | - Q Zheng
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - S P Weathersby
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - A H Reid
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R Coffee
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - I Makasyuk
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - S Edstrom
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - D McCormick
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - K Jobe
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - C Hast
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - S H Glenzer
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - X Wang
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
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20
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Cesar D, Maxson J, Musumeci P, Sun Y, Harrison J, Frigola P, O'Shea FH, To H, Alesini D, Li RK. Demonstration of Single-Shot Picosecond Time-Resolved MeV Electron Imaging Using a Compact Permanent Magnet Quadrupole Based Lens. Phys Rev Lett 2016; 117:024801. [PMID: 27447510 DOI: 10.1103/physrevlett.117.024801] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Indexed: 06/06/2023]
Abstract
We present the results of an experiment where a short focal length (∼1.3 cm), permanent magnet electron lens is used to image micron-size features (of a metal sample) with a single shot from an ultrahigh brightness picosecond-long 4 MeV electron beam emitted by a radio-frequency photoinjector. Magnification ratios in excess of 30× were obtained using a triplet of compact, small gap (3.5 mm), Halbach-style permanent magnet quadrupoles with nearly 600 T/m field gradients. These results pave the way towards single-shot time-resolved electron microscopy and open new opportunities in the applications of high brightness electron beams.
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Affiliation(s)
- D Cesar
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - J Maxson
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - P Musumeci
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - Y Sun
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - J Harrison
- Department of Electrical Engineering, UCLA, Los Angeles, California 90095, USA
| | - P Frigola
- RadiaBeam Technologies, 1717 Stewart Street, Santa Monica, California 90404, USA
| | - F H O'Shea
- RadiaBeam Technologies, 1717 Stewart Street, Santa Monica, California 90404, USA
| | - H To
- RadiaBeam Technologies, 1717 Stewart Street, Santa Monica, California 90404, USA
| | - D Alesini
- INFN-LNF, Via E. Fermi, 40-00044 Frascati, Rome, Italy
| | - R K Li
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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21
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Xia M, Li RK. Structural variety in zinc telluro-phosphates: syntheses, crystal structures and characterizations of Sr2Zn3Te2P2O14, Pb2Zn3Te2P2O14 and Ba2Zn2TeP2O11. Dalton Trans 2016; 45:7492-9. [PMID: 27046132 DOI: 10.1039/c6dt00058d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [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
Three new zinc telluro-phosphates, Sr2Zn3Te2P2O14 (1), Pb2Zn3Te2P2O14 (2) and Ba2Zn2TeP2O11 (3), were grown by flux method, and their crystal structures were solved by X-ray diffraction method. Although all three crystals crystallize into the same space group P21/c with similar chemical compositions, they exhibit different topology structure types. 1 features a two-dimensional layered structure with the connection of TeO4 and (Zn3TeP2O18)(16-) 12-membered rings (MRs), which are composed of planar square and tetrahedral configuration ZnO4 groups, tetrahedral PO4 and seesaw TeO4. Due to lone-pair Coulomb repulsion of Pb(2+), the structure of 2, which is also composed of unbalanced seesaw TeO4 and ZnO4 groups and distorted PO4 tetrahedra, is slightly different from that of its analog 1. Compound 3 exhibits a complicated three-dimensional network with (Zn2PO9)(9-) 6-MRs and (Zn2Te2O10)(8-) 8-MRs built from distorted tetrahedral ZnO4 and PO4 groups and trigonal pyramidal TeO3 units. According to UV-vis-NIR diffuse reflectance spectra, compounds 1, 2 and 3 are highly transparent in the range of 450 to 2500 nm with a UV cut-off of 275 nm, 330 nm and 278 nm, respectively. In addition, the characterizations, including thermal analyses, XPS measurement and dipole moment calculations, are also reported.
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Affiliation(s)
- Mingjun Xia
- Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
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22
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Xia M, Hou Z, Yang Y, Xu B, Liu L, Wang X, Lin Z, Li RK, Chen C. Chemical engineering of mixed halide hexaborates as nonlinear optical materials. RSC Adv 2016. [DOI: 10.1039/c6ra21584j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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
Mixed polar halide hexaborates were investigated to unravel their microscopic structural variations and the compositional impacts on optical properties.
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Affiliation(s)
- Mingjun Xia
- Beijing Center for Crystal Research and Development
- Key Laboratory of Functional Crystals and Laser Technology
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Zhanyu Hou
- Beijing Center for Crystal Research and Development
- Key Laboratory of Functional Crystals and Laser Technology
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Yi Yang
- Beijing Center for Crystal Research and Development
- Key Laboratory of Functional Crystals and Laser Technology
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Bo Xu
- Beijing Center for Crystal Research and Development
- Key Laboratory of Functional Crystals and Laser Technology
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Lijuan Liu
- Beijing Center for Crystal Research and Development
- Key Laboratory of Functional Crystals and Laser Technology
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Xiaoyang Wang
- Beijing Center for Crystal Research and Development
- Key Laboratory of Functional Crystals and Laser Technology
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Zheshuai Lin
- Beijing Center for Crystal Research and Development
- Key Laboratory of Functional Crystals and Laser Technology
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - R. K. Li
- Beijing Center for Crystal Research and Development
- Key Laboratory of Functional Crystals and Laser Technology
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Chuangtian Chen
- Beijing Center for Crystal Research and Development
- Key Laboratory of Functional Crystals and Laser Technology
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
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23
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Wang X, Xia M, Li RK. Two potential self-activated orthoborates Cd4NdO(BO3)3 and Ca3Nd3(BO3)5: growth, crystal structures and optical properties. NEW J CHEM 2016. [DOI: 10.1039/c5nj02710a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [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
Different arrangements of NdOn polyhedra in the two crystal structures can result in a huge difference of their fluorescence lifetime.
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Affiliation(s)
- Xing Wang
- Beijing Center for Crystal Research and Development
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Mingjun Xia
- Beijing Center for Crystal Research and Development
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - R. K. Li
- Beijing Center for Crystal Research and Development
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
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24
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Weathersby SP, Brown G, Centurion M, Chase TF, Coffee R, Corbett J, Eichner JP, Frisch JC, Fry AR, Gühr M, Hartmann N, Hast C, Hettel R, Jobe RK, Jongewaard EN, Lewandowski JR, Li RK, Lindenberg AM, Makasyuk I, May JE, McCormick D, Nguyen MN, Reid AH, Shen X, Sokolowski-Tinten K, Vecchione T, Vetter SL, Wu J, Yang J, Dürr HA, Wang XJ. Mega-electron-volt ultrafast electron diffraction at SLAC National Accelerator Laboratory. Rev Sci Instrum 2015; 86:073702. [PMID: 26233391 DOI: 10.1063/1.4926994] [Citation(s) in RCA: 138] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Ultrafast electron probes are powerful tools, complementary to x-ray free-electron lasers, used to study structural dynamics in material, chemical, and biological sciences. High brightness, relativistic electron beams with femtosecond pulse duration can resolve details of the dynamic processes on atomic time and length scales. SLAC National Accelerator Laboratory recently launched the Ultrafast Electron Diffraction (UED) and microscopy Initiative aiming at developing the next generation ultrafast electron scattering instruments. As the first stage of the Initiative, a mega-electron-volt (MeV) UED system has been constructed and commissioned to serve ultrafast science experiments and instrumentation development. The system operates at 120-Hz repetition rate with outstanding performance. In this paper, we report on the SLAC MeV UED system and its performance, including the reciprocal space resolution, temporal resolution, and machine stability.
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Affiliation(s)
- S P Weathersby
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - G Brown
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M Centurion
- University of Nebraska-Lincoln, 855 N 16th Street, Lincoln, Nebraska 68588, USA
| | - T F Chase
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R Coffee
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J Corbett
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J P Eichner
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J C Frisch
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - A R Fry
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M Gühr
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - N Hartmann
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - C Hast
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R Hettel
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R K Jobe
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - E N Jongewaard
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J R Lewandowski
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - R K Li
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - A M Lindenberg
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - I Makasyuk
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J E May
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - D McCormick
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - M N Nguyen
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - A H Reid
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - X Shen
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | | | - T Vecchione
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - S L Vetter
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J Wu
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - J Yang
- University of Nebraska-Lincoln, 855 N 16th Street, Lincoln, Nebraska 68588, USA
| | - H A Dürr
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
| | - X J Wang
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA
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25
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Abstract
A terbium rich orthoborate, LiSrTb2(BO3)3, shows paramagnetic behavior, and up to 21 isomorphic analogues have been prepared.
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Affiliation(s)
- Pengyun Chen
- Beijing Center for Crystal Research and Development
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Mingjun Xia
- Beijing Center for Crystal Research and Development
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - R. K. Li
- Beijing Center for Crystal Research and Development
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
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Duris J, Musumeci P, Babzien M, Fedurin M, Kusche K, Li RK, Moody J, Pogorelsky I, Polyanskiy M, Rosenzweig JB, Sakai Y, Swinson C, Threlkeld E, Williams O, Yakimenko V. High-quality electron beams from a helical inverse free-electron laser accelerator. Nat Commun 2014; 5:4928. [PMID: 25222026 DOI: 10.1038/ncomms5928] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Accepted: 08/08/2014] [Indexed: 11/09/2022] Open
Abstract
Compact, table-top sized accelerators are key to improving access to high-quality beams for use in industry, medicine and academic research. Among laser-based accelerating schemes, the inverse free-electron laser (IFEL) enjoys unique advantages. By using an undulator magnetic field in combination with a laser, GeV m(-1) gradients may be sustained over metre-scale distances using laser intensities several orders of magnitude less than those used in laser wake-field accelerators. Here we show for the first time the capture and high-gradient acceleration of monoenergetic electron beams from a helical IFEL. Using a modest intensity (~10(13) W cm(-2)) laser pulse and strongly tapered 0.5 m long undulator, we demonstrate >100 MV m(-1) accelerating gradient, >50 MeV energy gain and excellent output beam quality. Our results pave the way towards compact, tunable GeV IFEL accelerators for applications such as driving soft X-ray free-electron lasers and producing γ-rays by inverse Compton scattering.
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Affiliation(s)
- J Duris
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - P Musumeci
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - M Babzien
- Accelerator Test Facility, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - M Fedurin
- Accelerator Test Facility, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - K Kusche
- Accelerator Test Facility, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - R K Li
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - J Moody
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - I Pogorelsky
- Accelerator Test Facility, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - M Polyanskiy
- Accelerator Test Facility, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - J B Rosenzweig
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - Y Sakai
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - C Swinson
- Accelerator Test Facility, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - E Threlkeld
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - O Williams
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - V Yakimenko
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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27
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Affiliation(s)
- Jing Zhao
- Beijing Center
for Crystal Research and Development, Key Laboratory of Functional
Crystals and Laser Technology, Technical Institute of Physics and
Chemistry, Chinese Academy of Sciences, 29 Zhongguancun East Road, Beijing 100190, China
| | - R. K. Li
- Beijing Center
for Crystal Research and Development, Key Laboratory of Functional
Crystals and Laser Technology, Technical Institute of Physics and
Chemistry, Chinese Academy of Sciences, 29 Zhongguancun East Road, Beijing 100190, China
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28
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Kubota K, Ichinose Y, Scagliotti G, Spigel D, Kim JH, Shinkai T, Takeda K, Kim SW, Hsia TC, Li RK, Tiangco BJ, Yau S, Lim WT, Yao B, Hei YJ, Park K. Phase III study (MONET1) of motesanib plus carboplatin/paclitaxel in patients with advanced nonsquamous nonsmall-cell lung cancer (NSCLC): Asian subgroup analysis. Ann Oncol 2014; 25:529-36. [PMID: 24419239 DOI: 10.1093/annonc/mdt552] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND This preplanned subset analysis of the phase III MONET1 study aimed to determine whether motesanib combined with carboplatin/paclitaxel (C/P) would result in improved overall survival (OS) versus chemotherapy alone, in a subset of Asian patients with nonsquamous nonsmall-cell lung cancer (NSCLC). PATIENTS AND METHODS Patients with nonsquamous NSCLC (stage IIIB/IV or recurrent) and no prior systemic therapy for advanced disease were randomized to IV carboplatin (AUC, 6 mg/ml min) and paclitaxel (200 mg/m2) for up to six 3-week cycles, plus either oral motesanib 125 mg q.d. or placebo. Primary end point was OS; secondary end points included progression-free survival (PFS), objective response rate (ORR), and safety. RESULTS Two hundred twenty-seven Asian patients from MONET1 were included in this descriptive analysis. Median OS was 20.9 months in the motesanib plus C/P arm and 14.5 months in the placebo plus C/P arm (P=0.0223); median PFS was 7.0 and 5.3 months, respectively, (P=0.0004); and ORR was 62% and 27%, respectively, (P<0.0001). Grade≥3 adverse events were more common in the motesanib plus C/P arm versus placebo plus C/P (79% versus 61%). CONCLUSION In this preplanned subset analysis of Asian patients with nonsquamous NSCLC, motesanib plus C/P significantly improved OS, PFS, and ORR versus placebo plus C/P. CLINICAL TRIAL NUMBER NCT00460317.
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Affiliation(s)
- K Kubota
- Department of Pulmonary Medicine and Oncology, Graduate School of Medicine, Nippon Medical School, Tokyo
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29
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30
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Li RK, To H, Andonian G, Feng J, Polyakov A, Scoby CM, Thompson K, Wan W, Padmore HA, Musumeci P. Surface-plasmon resonance-enhanced multiphoton emission of high-brightness electron beams from a nanostructured copper cathode. Phys Rev Lett 2013; 110:074801. [PMID: 25166375 DOI: 10.1103/physrevlett.110.074801] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Indexed: 06/03/2023]
Abstract
We experimentally investigate surface-plasmon assisted photoemission to enhance the efficiency of metallic photocathodes for high-brightness electron sources. A nanohole array-based copper surface was designed to exhibit a plasmonic response at 800 nm, fabricated using the focused ion beam milling technique, optically characterized and tested as a photocathode in a high power radio frequency photoinjector. Because of the larger absorption and localization of the optical field intensity, the charge yield observed under ultrashort laser pulse illumination is increased by more than 100 times compared to a flat surface. We also present the first beam characterization results (intrinsic emittance and bunch length) from a nanostructured photocathode.
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Affiliation(s)
- R K Li
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - H To
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - G Andonian
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - J Feng
- Advanced Light Source Division, LBNL, Berkeley, California 94720, USA
| | - A Polyakov
- Advanced Light Source Division, LBNL, Berkeley, California 94720, USA
| | - C M Scoby
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
| | - K Thompson
- Advanced Light Source Division, LBNL, Berkeley, California 94720, USA
| | - W Wan
- Advanced Light Source Division, LBNL, Berkeley, California 94720, USA
| | - H A Padmore
- Advanced Light Source Division, LBNL, Berkeley, California 94720, USA
| | - P Musumeci
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
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33
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Scoby CM, Li RK, Musumeci P. Effect of an ultrafast laser induced plasma on a relativistic electron beam to determine temporal overlap in pump-probe experiments. Ultramicroscopy 2012; 127:14-8. [PMID: 22951263 DOI: 10.1016/j.ultramic.2012.07.015] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this paper we report on a simple and robust method to measure the absolute temporal overlap of the laser and the electron beam at the sample based on the effect of a laser induced plasma on the electron beam transverse distribution, successfully extending a similar method from keV to MeV electron beams. By pumping a standard copper TEM grid to form the plasma, we gain timing information independent of the sample under study. In experiments discussed here the optical delay to achieve temporal overlap between the pump electron beam and probe laser can be determined with ~1 ps precision.
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Affiliation(s)
- Cheyne M Scoby
- UCLA Department of Physics, 475 Portola Plaza, Los Angeles, CA 90095-1547, USA.
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34
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Affiliation(s)
- Jing Zhao
- Beijing Center for Crystal Research
and Development, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, People's
Republic of China
- Graduate University of Chinese Academy of Sciences,
Beijing 100049, People's Republic of China
| | - R. K. Li
- Beijing Center for Crystal Research
and Development, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, People's
Republic of China
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35
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36
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Vahdat LT, Vrdoljak E, Gomez H, Li RK, Thomas E, Bosserman LD, Sparano JA, Baselga J, Mukhopadhyay P, Valero V. Efficacy and safety of ixabepilone plus capecitabine in elderly patients with anthracycline- and taxane-pretreated metastatic breast cancer. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.1083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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37
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Musumeci P, Li RK, Marinelli A. Nonlinear longitudinal space charge oscillations in relativistic electron beams. Phys Rev Lett 2011; 106:184801. [PMID: 21635094 DOI: 10.1103/physrevlett.106.184801] [Citation(s) in RCA: 2] [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: 02/16/2011] [Indexed: 05/30/2023]
Abstract
In this Letter we study the evolution of an initial periodic modulation in the temporal profile of a relativistic electron beam under the effect of longitudinal space-charge forces. Linear theory predicts a periodic exchange of the modulation between the density and the energy profiles at the beam plasma frequency. For large enough initial modulations, wave breaking occurs after 1/2 period of plasma oscillation leading to the formation of short current spikes. We confirm this effect by direct measurements on a ps-modulated electron beam from an rf photoinjector. These results are useful for the generation of intense electron pulse trains for advanced accelerator applications.
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Affiliation(s)
- P Musumeci
- Department of Physics and Astronomy, UCLA, Los Angeles, California 90095, USA
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38
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Abstract
A total of 220 bacterial isolates were obtained from pea rhizosphere and nonrhizosphere samples. Of these samples, 100 isolates were chosen randomly to test for their agglutinative reaction against pea root exudate. The percentage of positive agglutination of bacteria isolated from the nonrhizosphere sample was significantly lower than that of bacteria isolated from the rhizosphere sample. Moreover, this agglutinative reaction could not be blocked either by treating the bacterial cells or root exudate with different carbohydrates before they were mixed or by boiling the root exudate first. Bacteria that could be agglutinated by pea root exudate followed the downward growth of the pea root through the soil profile. The greater abilities of such bacteria to colonize the pea rhizosphere were indicated by their higher rhizosphere-colonizing (rhizosphere/nonrhizosphere) ratios, whether the bacteria were added alone or together with nonagglutinating bacteria. However, bacteria did show different agglutinative reactions toward root exudates obtained from different plants.
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Affiliation(s)
- W L Chao
- Department of Microbiology, Soochow University, Shih Lin, Taipei, Taiwan, Republic of China
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39
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Li RK, Chen P. Cation Coordination Control of Anionic Group Alignment to Maximize SHG Effects in the BaMBO3F (M = Zn, Mg) Series. Inorg Chem 2010; 49:1561-5. [DOI: 10.1021/ic901698b] [Citation(s) in RCA: 104] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- R. K. Li
- Beijing Center for Crystal Research and Development, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Peng Chen
- Beijing Center for Crystal Research and Development, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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40
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Li RK, Chen P. KBa7Mg2B14O28F5, a new borate with an unusual heptaborate group and double perovskite unit. Acta Crystallogr C 2009; 66:i7-8. [DOI: 10.1107/s0108270109054341] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2009] [Accepted: 12/16/2009] [Indexed: 11/10/2022] Open
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41
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Kaleta R, Chung HC, Park SR, Li RK, Kim Y, Kim H, Langenaeken J, George CP, de Wit EJ. Single agent IV vinflunine (VFL) in the second-line treatment of patients (pts) with advanced gastric cancer (AGC): Initial results of a phase II trial. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.15533] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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42
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Abstract
Trirubidium diyttrium triborate contains zigzag chains of corner-sharing [Y2O10] dimers. The chains are reinforced by one independent BO3 group and crosslinked by the other two types of BO3 groups to form a three-dimensional framework. Channels along the [100] direction accommodate the Rb+ cations.
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Affiliation(s)
- J H Gao
- Beijing Center for Crystal Research and Development, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, PO Box 2711, Beijing 100080, People's Republic of China
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43
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Abstract
The title compound, Ba4Ga2B8O18Cl2.NaCl, is found to crystallize in a polar space group P4(2)nm with cell dimensions of a = 12.1134(2) A and c = 6.8456(1) A. The basic building blocks of the structure are the B4O9 groups, which are interconnected by the GaO4 tetrahedron to form a three-dimensional net with Ba2+ ion-, Cl- ion-, and NaCl molecule-filled tunnels. This net structure is closely related to that of mineral hilgardite, with which many variant compounds have been found. Both a powder second-harmonic-generation test and calculations suggest that it possesses an optical nonlinearity comparable to that of potassium dihydrogen phosphate.
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Affiliation(s)
- R K Li
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China.
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44
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Chen KS, Li RK, Liao SJ. Process capability analysis of a product family of larger-the-better type. Journal of Information and Optimization Sciences 2004. [DOI: 10.1080/02522667.2004.10699595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Fedak PW, Verma S, Weisel RD, Mickle DA, Li RK. Angiogenesis: protein, gene, or cell therapy? Heart Surg Forum 2002; 4:301-4. [PMID: 11827855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Affiliation(s)
- P W Fedak
- Toronto General Hospital, Division of Cardiac Surgery, University of Toronto, Toronto, Canada
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Aikens LD, Gillie LJ, Li RK, Greaves C. Staged fluorine insertion into manganese oxides with Ruddlesden–Popper structures: LaSrMnO4F and La1.2Sr1.8Mn2O7F. ACTA ACUST UNITED AC 2001. [DOI: 10.1039/b105550j] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
BACKGROUND This study was designed to determine the optimal time for cell transplantation after myocardial injury. METHODS The left ventricular free wall of adult rat hearts was cryoinjured and the animals were sacrificed at 0, 1, 2, 4, and 8 weeks for histologic studies. Fetal rat cardiomyocytes (transplant) or culture medium (control) were transplanted immediately (n = 8), 2 weeks (n = 8), and 4 weeks (n = 12) after cryoinjury. At 8 weeks, rat heart function, planimetry, and histologic studies were performed. RESULTS Cryoinjury produced a transmural injury. The inflammatory reaction was greatest during the first week but subsided during the second week after cryoinjury. Scar size expanded (p < 0.01) at 4 and 8 weeks. Cardiomyocytes transplanted immediately after cryoinjury were not found 8 weeks after cryoinjury. Scar size and myocardial function were similar to the control hearts. Cardiomyocytes transplanted at 2 and 4 weeks formed cardiac tissue within the scar, limited (p < 0.01) scar expansion, and had better (p < 0.001) heart function than the control groups. Developed pressure was greater (p < 0.01) in the hearts with transplanted cells at 2 weeks than at 4 weeks. CONCLUSIONS Cardiomyocyte transplantation was most successful after the inflammatory reaction resolved but before scar expansion.
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Affiliation(s)
- R K Li
- Division of Cardiac Surgery, Toronto Hospital Research Institute, and Toronto General Hospital, Ontario, Canada.
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Abstract
PURPOSE Myocardial angiogenesis may improve regional perfusion and perhaps function after cardiac injury. We evaluated the effect of endothelial cell transplantation into a myocardial scar on angiogenesis and ventricular function, as an alternative to angiogenic gene or protein therapy. METHODS AND RESULTS A transmural myocardial scar was created in the left ventricular free wall of rat hearts by cryoinjury. Allogeneic aortic endothelial cells were injected into the scar 2 weeks after cryoinjury. A cluster of transplanted cells was identified at the site of injection 1 day and 1 week after transplantation, but not after 2 weeks. The size of this cluster of transplanted cells decreased as vascular density in the transplanted scar tissue increased with time. Six weeks after transplantation, vascular density was significantly greater in transplanted hearts than in control hearts. Regional blood flow, by microsphere analysis, was greater in the transplanted rats. Systolic and diastolic ventricular function was similar between groups. In a second series of experiments, syngeneic aortic endothelial cells labeled with bromodeoxyuridine were transplanted 2 weeks after cryoinjury. Vascular density in the transplanted scar was greater than in controls. Labeled transplanted endothelial cells were identified forming part of the newly developed blood vessels. No difference in vascular density was found between allogeneic and syngeneic cell transplantation. Vascular endothelial growth factor was not expressed at greater levels in the transplanted cells or the myocardial scar. CONCLUSION Transplanted endothelial cells stimulated angiogenesis, were incorporated into the new vessels, and increased regional perfusion in myocardial scar tissue, but did not improve global function in this cryoinjury rat model.
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Affiliation(s)
- E J Kim
- Toronto General Hospital, Toronto General Research Institute, University Health Network, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
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Abstract
UNLABELLED BACKGROUND The combination of myocardial cell transplantation and angiogenic gene transfer may improve postinfarction left ventricular (LV) perfusion. We evaluated the angiogenic effect of heart cells transfected with vascular endothelial growth factor (VEGF) and transplanted into a myocardial scar. METHODS AND RESULTS Donor rat heart cells were transfected with plasmids encoding VEGF(165) and green fluorescence protein. Syngeneic adult rats underwent LV cryoinjury to create a transmural scar. Three weeks later, 4x10(6) transfected heart cells (n=14), untransfected heart cells (n=13), or culture medium (n=16) were transplanted into the center of the scar. After 5 weeks, LV function, quantitative histology, and regional blood flow were evaluated. Plates of heart cells transfected with VEGF(165) produced 6.1 times more intracellular VEGF than nontransfected cells. Capillary density (mean+/-SEM) per high-power field in the center of the myocardial scar was 1.1+/-0.02 in control rats, 3.9+/-0.11 in untransfected rats, and 6.3+/-0.11 in transfected rats (P=0.0002). Capillary density in the border zone around the scar was 1.9+/-0.03 in control rats, 6.4+/-0.10 in untransfected rats, and 8.7+/-0.16 in transfected rats (P=0.004). Regional blood flow within the scar was 8.8+/-0.8% of normalized flow in control hearts, 10.4+/-0.7% in hearts transplanted with untransfected cells, but 17.6+/-1.2% in hearts transplanted with transfected cells (P=0.03 versus control, P=0.07 versus nontransfected). There was no difference in LV function attributable to transplantation with transfected cells at the time point studied. CONCLUSIONS Transplantation of heart cells transfected with VEGF induced greater angiogenesis than transplantation of unmodified cells. Combined gene transfer and cell transplantation strategies may improve postinfarction LV perfusion and function.
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Affiliation(s)
- T M Yau
- Division of Cardiovascular Surgery, Toronto General Hospital, University Health Network, Department of Surgery, University of Toronto, Toronto, Ontario, Canada.
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Abstract
One hundred clinical isolates of Sporothrix schenckii were tested against voriconazole, itraconazole and amphotericin B using a modification of the NCCLS M27-A in vitro yeast susceptibility testing procedure. NCCLS M38-P for moulds was not used because yeast forms may have been present when the test isolates were incubated at 35 +/- 1 degrees C. The minimum inhibitory concentration (MIC) values were: voriconazole 0.5-8 (geometric mean titer 6.50) microg ml(-1) ; itraconazole 0.03-8 (geometric mean titer 1.56) microg ml(-1); and amphotericin B 0.25-2 (geometric mean titer 1.23) microg ml(-1). The minimum fungicidal concentration (MFC) values were: voriconazole 2-8 (geometric mean titer 7.67) microg ml(-1); itraconazole 0.125-8 (geometric mean titer 7.41) microg ml(-1); and amphotericin B 0.125-2 (geometric mean titer 1.53) microg ml(-1). Based upon MIC values, sensitivity to amphotericin B is strain-dependent. S. schenckii is more sensitive to itraconazole than voriconazole based upon a comparison of MIC geometric means, even though the MIC ranges were essentially the same.
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Affiliation(s)
- M R McGinnis
- Department of Pathology, University of Texas Medical Branch, Galveston 77555-0609, USA.
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