THOT07 　ビーム診断・ビーム制御／粒子源　 8月1日 テルサホール 10:50-11:10

広帯域高周波アンプ型パルサーと高インピーダンスビームチョッパーを用いたマルチバンチ低エミッタンス電子ビームの生成

Generation of a low-emittance electron beam with multi-bunch structure using a wide-band radio-frequency amplifier pulser and a high-impedance beam chopper

○渡川 和晃，前坂 比呂和，Goryashko Vitaliy，田中 均（理研），前平 晃太郎，竹村 育浩，林田 寿和（スプリングエイトサービス株式会社）

○Kazuaki Togawa, Hirokazu Maesaka, Vitaliy Goryashko, Hitoshi Tanaka (RIKEN), Koutarou Maehira, Yasuhiro Takemura, Toshikazu Hayashida (SPring-8 Service Co., Ltd.)

At the SPring-8 campus, an R&D program on an advanced electron injector for the X-ray free-electron laser (XFEL) facility SACLA has started. The electron injector comprises a pulsed high-voltage DC gun and a nanosecond chopper to extract a short beam for SACLA operation. Recently, a new beam chopper system has been developed. It consists of a wide-band radio-frequency amplifier pulser and a high-impedance stripline chamber, and aims at enhancing the stability and flexibility of XFEL operation. Taking the advantage of arbitrary wave amplification, the generation of a low-emittance electron beam with multi-bunch structure has been successfully demonstrated at the gun test stand. This development marks a significant milestone, paving the way for new modes of SACLA operation, future SACLA upgrades for high-repetition-rate operation, and flexible time structures of XFEL radiation pulses for user experiments.