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Nishimori, N.

Paper Title Page
TUPE087 Development of a Photocathode Test Bench using a Cryo-pump and a NEG Pump 2326
 
  • D. Kubo, H. Iijima, K. Ito, M. Kuriki, Y. Masumoto, C. Shonaka
    HU/AdSM, Higashi-Hiroshima
  • N. Nishimori
    JAEA/ERL, Ibaraki
  • M. Yamamoto
    KEK, Ibaraki
 
 

A NEA-GaAs photocathode is an important component for the next generation light source based on the ERL. Although the NEA-GaAs cathode has high quantum efficiency, deterioration of the NEA surface becomes serious with a high current operation. Therefore improvement of a vacuum in the cathode chamber is essential to get a long lifetime of the NEA-GaAs cathode. We are developing a photocathode test bench consisting of titanium (TP340) chamber, whose outgas rate is 1/1000 smaller than one of a SUS chamber, a cryo-pump (4000l/s) and a NEG pump (1900l/s). We report mainly the vacuum performance of the system.

 
TUPE093 High-Voltage Test of a 500-kV Photo-Cathode DC Gun for the ERL Light Sources in Japan 2341
 
  • R. Nagai, R. Hajima, N. Nishimori
    JAEA/ERL, Ibaraki
  • Y. Honda, T. Miyajima, T. Muto, M. Yamamoto
    KEK, Ibaraki
  • H. Iijima, M. Kuriki
    HU/AdSM, Higashi-Hiroshima
  • M. Kuwahara, T. Nakanishi, S. Okumi
    Nagoya University, Nagoya
 
 

A 500-kV, 10-mA photocathode DC gun has been designed and is now under fabrication by the collaboration efforts of JAEA, KEK, Hiroshima Univ. and Nagoya Univ. The Cockcroft-Walton generator and the ceramic insulator are installed upright in the SF6 tank. We have adopted a multiple-stacked cylindrical ceramic insulator, because this type of ceramic insulator has shown good stability and robustness at the 200-kV Nagoya polarized gun and the 250-kV JAEA FEL gun. The vacuum chamber, the guard-rings and the support-rod electrode are made of titanium alloy with very low out-gassing and robustness to high voltage performances. The Cockcroft-Walton generator, the ceramic insulator, the vacuum chamber and the guard-rings have been assembled and a high-voltage test has been successfully done with up to 550kV. The high-voltage test and up-to-date status of the gun development will be presented in detail.

 
TUPE091 Recent Progress in the Energy Recovery Linac Project in Japan 2338
 
  • S. Sakanaka, M. Akemoto, T. Aoto, D.A. Arakawa, S. Asaoka, A. Enomoto, S. Fukuda, K. Furukawa, T. Furuya, K. Haga, K. Hara, K. Harada, T. Honda, Y. Honda, H. Honma, T. Honma, K. Hosoyama, M. Isawa, E. Kako, T. Kasuga, H. Katagiri, H. Kawata, Y. Kobayashi, Y. Kojima, T. Matsumoto, H. Matsushita, S. Michizono, T.M. Mitsuhashi, T. Miura, T. Miyajima, H. Miyauchi, S. Nagahashi, H. Nakai, H. Nakajima, E. Nakamura, K. Nakanishi, K. Nakao, T. Nogami, S. Noguchi, S. Nozawa, T. Obina, S. Ohsawa, T. Ozaki, C.O. Pak, H. Sakai, H. Sasaki, Y. Sato, K. Satoh, M. Satoh, T. Shidara, M. Shimada, T. Shioya, T. Shishido, T. Suwada, M. Tadano, T. Takahashi, R. Takai, T. Takenaka, Y. Tanimoto, M. Tobiyama, K. Tsuchiya, T. Uchiyama, A. Ueda, K. Umemori, K. Watanabe, M. Yamamoto, S. Yamamoto, Y. Yamamoto, Y. Yano, M. Yoshida
    KEK, Ibaraki
  • M. Adachi, M. Katoh, H. Zen
    UVSOR, Okazaki
  • R. Hajima, R. Nagai, N. Nishimori, M. Sawamura
    JAEA/ERL, Ibaraki
  • H. Hanaki
    JASRI/SPring-8, Hyogo-ken
  • H. Iijima, M. Kuriki
    HU/AdSM, Higashi-Hiroshima
  • I. Ito, H. Kudoh, N. Nakamura, S. Shibuya, K. Shinoe, H. Takaki
    ISSP/SRL, Chiba
  • H. Kurisu
    Yamaguchi University, Ube-Shi
  • M. Kuwahara, T. Nakanishi, S. Okumi
    Nagoya University, Nagoya
  • S. Matsuba
    Hiroshima University, Graduate School of Science, Higashi-Hiroshima
  • T. Muto
    Tohoku University, School of Scinece, Sendai
  • K. Torizuka, D. Yoshitomi
    AIST, Tsukuba
 
 

Future synchrotron light source using a 5-GeV-class energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting active R&D efforts for that. We are developing super-brilliant DC photocathode guns, two types of cryomodules for both injector and main superconducting linacs, 1.3 GHz high CW-power rf sources, and other important components. We are also constructing a compact ERL for demonstrating the recirculation of low-emittance, high-current beams using those key components. We present our recent progress in this project.