TUP058 　ポスター①　 10月18日 会議室P 13:30-15:30

SuperKEKB RF電子銃用レーザー安定化の開発

Development of laser stabilization for SuperKEKB RF gun

○張 叡（高エネルギー加速器研究機構），豊富 直之（三菱電機システムサービス(株)），吉田 光宏（高エネルギー加速器研究機構）

○Rui Zhang (High Energy Accelerator Research Organization (KEK)), Naoyuki Toyotomi (Mitsubishi Electric System & Service Co., Ltd.), Mitsuhiro Yoshida (High Energy Accelerator Research Organization (KEK))

Electron beam with high charge and low emittance is required for SuperKEKB high energy ring (HER) injection. After entering phase III commissioning of SuperKEKB, about 2.0 nC electron beam with comparable low emittance has been achieved successfully for injection. For continuous and stable injection and physics run, the stability of laser operation is extremely important. Due to the temperature fluctuation and long transporting line from laser hut to tunnel, the laser beam pointing stability was about 50 μm along horizontal and vertical direction. For improving the laser pointing stability, laser beam position sensor and piezo mirror mount feedback system have been developed and applied. By use of this system, the laser pointing stability has been improved dramatically. Furthermore, it is no necessary to adjust the laser beam position manually during the continuous injection and commissioning.