THP049 　加速構造　 8月9日 大展示ホール 13:10 - 15:10

CLICプロトタイプ加速管の高電界特性

High-gradient performance of CLIC prototype accelerating structures

○肥後 寿泰，阿部 哲郎，松本 修二，高富 俊和，東 保男（高エネルギー加速器研究機構），吴 晓伟（清華大学、中国）

○Toshiyasu Higo, Tetsuo Abe, Shuji Matsumoto, Toshikazu Takatomi, Yasuo Higashi (KEK), Xiaowei Wu (Tsinghua University, China)

From 2009 until now, ten CLIC prototype X-band accelerating structures have been tested at Nextef of KEK aiming at studying the feasibility of the operation at 100 MV/m in the TW one-foot-long structures. Each test has been conducted for typically more than a few thousand hours at 50 Hz. In summarizing these tests, we observed the statistical nature of the vacuum breakdowns on top of the structure individuality and different conditioning reality. We observed and studied such physical properties as the dark current, breakdown rate, RF pulse shapes, and so on. By taking the advantage of the tests conducted in the same system for all of the structures, we compared among the tested structures to deduce the intrinsic features. In the present paper, we present the observed features, such as the reduction of breakdown rate, the relation of the dark current amount to the high-gradient performance and the statistical nature of the breakdown appearance, etc. to review the high-gradient characteristics in the TW high-gradient accelerating structures operated about 3 times higher than the gradient of today’s usual accelerators.