Tuning of RF amplitude and phase for the drift tube linac in J-PARC

作     者：沈国保 Masanori Ikegami 

作者机构：Japan Atomic Energy Agency(JAEA)2-4 Shirakata-Shirane High Energy Accelerator Research Organization(KEK) 

出 版 物：《Chinese Physics C》 (中国物理C（英文版）)

年 卷 期：2009年第33卷第7期

页      面：577-582页

核心收录：

学科分类：08[工学] 082701[工学-核能科学与工程] 0827[工学-核科学与技术] 

主　　题：high-intensity beam drift tube linac signature matching J-PARC 

摘      要：The J-PARC linac has three DTL tanks to accelerate the negative hydrogen ions from 3 MeV to 50 MeV. The RF phase and amplitude are adjusted for each cavity with a phase scan method within the accuracy of 1° in phase and 1% in amplitude. The experimental results show a remarkable agreement with the numerical model within a suffcient margin in the tuning of the last two DTL tanks. However,a notable discrepancy between the experiment and the numerical model is seen in the tuning of the first DTL tank. After studying with a three-dimensional multi-particle simulation,the generation of the low energy component and the pronounced filamentation are identified as the main causes of the discrepancy. The optimization of the tuning scheme is also discussed to attain the tuning goal accuracy for the first DTL tank.