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Development of a 500-kV photo-cathode DC gun for the ERL light sources in Japan

Nishimori, Nobuyuki; Nagai, Ryoji; Iijima, Hokuto; Hajima, Ryoichi; Yamamoto, Masahiro*; Muto, Toshiya*; Honda, Yosuke*; Miyajima, Tsukasa*; Kuriki, Masao*; Kuwahara, Makoto*; Okumi, Shoji*; Nakanishi, Tsutomu*

Energy recovery linac (ERL) based next generation light sources such as X-ray oscillator require high brightness electron gun. We have developed a 500-kV, 10-mA photocathode DC gun by the collaboration efforts of JAEA, KEK, Hiroshima University and Nagoya University. A segmented cylindrical ceramic insulator with guard rings is employed to improve stability and robustness at high voltage operation by keeping secondary electrons away from the ceramic surface. A Cockcroft-Walton power supply is installed in a SF6 tank and high voltage test up to 550 kV was successfully done. All the vacuum chambers are made of chemically polished titanium alloy with very low out-gassing. A photocathode preparation system was assembled and vacuum test is performed. Up-to-date status of the gun development will be presented in detail.

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