Author: Katoh, M.
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MOPIK011 Electron Beam Generation From InGaN/GaN Superlattice Photocathode 522
 
  • N. Yamamoto
    KEK, Ibaraki, Japan
  • M. Hosaka, A. Mano, T. Miyauchi, Y. Takashima
    Nagoya University, Nagoya, Japan
  • M. Katoh
    UVSOR, Okazaki, Japan
 
  GaAs-type photocathode (PC) has been used as electron spin polarization (ESP) sources for various applications. Recently, by using a strain-compensated technique for GaAs/GaAsP, the super lattice (SL) thickness of up to 720 nm could be manufactured and the quantum efficiency (QE) improvements with the thickness increases was observed. In the experiments, the ESP degradation was also observed for the thicker thickness samples than 194nm and we considered that electron spin relaxation during diffusion process in the PC caused the degradation. Therefore, we propose developing fcc-GaN based PCs instead of GaAs because a factor of ten longer spin relaxation time compared with GaAs/GaAsP SL was reported. However an fcc-GaN sample with adequate dimensions for PC applications is not available at present due to manufacturing difficulties. Then at the start of GaN-type PC development, an hcp-GaN sample has been studied. In the study, NEA-activation was made for an InGaN/GaN SL sample and QE, surface lifetime and ESP were measured. The QE and ESP values were 1.3% and 2.1% at the pump laser wavelength of 405nm.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK011  
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WEPAB048 Present Status of Accelerators in Aichi Synchrotron Radiation Center 2691
 
  • M. Hosaka, T. Ishida, A. Mano, A. Mochihashi, Y. Takashima
    Nagoya University, Nagoya, Japan
  • Y. Hori, N. Yamamoto
    KEK, Ibaraki, Japan
  • M. Katoh
    UVSOR, Okazaki, Japan
  • S. Koda
    SAGA, Tosu, Japan
  • H. Ohkuma, S. Sasaki
    JASRI/SPring-8, Hyogo, Japan
 
  Aichi Synchrotron Radiation Center is a synchrotron radiation facility in operation since 2013. The electron energy of the storage ring is 1.2 GeV and the circumference is 72 m. In spite of the compact size of the storage ring, synchrotron radiation up to hard X-ray region (~20 keV) is available from the 5 T super conducting bending magnets. Presently (Dec. 2016), 8 beamlines (5 hard X-ray and 3 soft X-ray) are in operation and 2 new hard X-ray beamlines are under commissioning. This contribution reports on the present status as well as machine studies to improve the performance of the accelerators.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPAB048  
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