Development of an electron gun for an ERL based light source in Japan

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

AIP Conference Proceedings 1149, p.1094 - 1098, 2009/08

https://doi.org/10.1063/1.3215600

We have constructed a prototype DC photoemission electron gun for a future energy recovery linac (ERL) based light source in Japan. The prototype gun is operated at up to 250 kV. A diagnostic beam line for emittance and bunch length measurements will be constructed soon. A 83.3 MHz Ti:sapphire laser with 500 mW average power and 2 ps pulse length is used to illuminate a GaAs photocathode. The prototype gun is designed to deliver up to 50 mA beam current. We have also designed a new 500 kV DC gun which is capable of producing up to 10 mA electron current with emittance lower than 1 mm-mrad. The high voltage terminal will be isolated by ten ceramics stacked in series. The new gun will satisfy performance required as an injector for the compact ERL, which will be constructed at KEK as a prototype of the future ERL light source. In this talk, our current status of the gun development has been presented.