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

ERL放射光源のための500kV光陰極DC電子銃開発

西森 信行; 永井 良治; 羽島 良一; 山本 将博*; 本田 洋介*; 宮島 司*; 武藤 俊哉*; 飯島 北斗*; 栗木 雅夫*; 桑原 真人*; 奥見 正治*; 中西 彊*

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

A high voltage photocathode DC gun is a promising gun for new generation energy recovery linac light sources. We recently succeeded in applying 500-kV on the ceramics for eight hours without any discharge for the first time. This high voltage testing was performed with a simple configuration without NEG pumps and electrodes. The next step is to repeat the same high voltage testing with a full configuration necessary for beam generation. We have designed electrodes for the maximum surface electric field not to exceed 11 MV/m at 500 kV while keeping the distance between the electrodes 100 mm. NEG pumps with a pumping speed of 7200 L/s have been installed in the gun chamber. A photocathode preparation system was connected to the gun chamber and beam generation is planned this summer.

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