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Beam current doubling of JAEA ERL-FEL

JAEA ERL-FELにおけるビーム電流の2倍化

永井 良治; 羽島 良一; 飯島 北斗; 菊澤 信宏; 峰原 英介; 西森 信行; 西谷 智博; 沢村 勝

Nagai, Ryoji; Hajima, Ryoichi; Iijima, Hokuto; Kikuzawa, Nobuhiro; Minehara, Eisuke; Nishimori, Nobuyuki; Nishitani, Tomohiro; Sawamura, Masaru

原子力機構では高出力自由電子レーザー(FEL)のためのエネルギー回収型リニアック(ERL)の開発を行っている。ERLの最大の利点は加速器の高周波源の容量を超えるビーム電流を加速できることにある。ミクロパルス繰返しを二倍にし、加速電流を二倍にするために、電子銃,入射器の高周波源,ローレベル高周波制御装置,加速器制御システムの改良を行ってきた。この結果、高周波源の容量を超える電流である10mAの加速に成功しFEL出力としては0.7kWを得ることができた。

An energy-recovery linac (ERL) for a high-power free-electron laser (FEL) R&D program is in progress at Japan Atomic Energy Agency (JAEA). The first energy-recovery operation and FEL lasing was demonstrated in 2002 by remodeling the original superconducting linac. In the first demonstration, the accelerated beam current was same as the original linac. One of the benefits of the ERL is that the accelerating beam current can be easily increase by changing micro-pulse repetition rate without increasing the main linac RF source. After the first demonstration, the e-gun, the injector RF source, the low-level RF controller, and the operation system were improved for the beam current doubling. The doubled beam acceleration and FEL lasing have been successfully achieved with 10mA of beam current and 0.7kW of FEL power.

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