MOP006 　ハドロン加速器　 8月8日 コンベンションホール 13:10 - 15:10

J-PARCリニアックビームスタディー進歩

Progresses of J-PARC linac commissioning

○劉 勇，丸田 朋史（高エネルギー加速器研究機構），三浦 昭彦（原研），宮尾 智章 （高エネルギー加速器研究機構）

○Yong Liu, Tomofumi Maruta (KEK), Akihiko Miura (JAEA), Tomoaki Miyao (KEK)

Main progresses of J-PARC linac commissioning in the past year were presented in the paper. Systematic Q-scan studied at MEBT1 helped to get more precise Twiss parameters, which are necessary to match to DTL and to set the whole linac with equi-partitioning condition. And furthermore, consistency was obtained with the measurement and improved RFQ simulation. In the MEBT2, which takes the role for the 3-fold frequency transition, measurements with presently one bunch shape monitor (BSM) were studied for a better understanding of the longitudinal phase space. Intra-beam striping effects of H- beam was identified as the dominant beam loss at the 191~400 MeV ACS section. Trials of mitigation with decreased transverse focusing were tested and candidate setting was proposed.