,Detailed study of RF properties of cold models for CW window-type RFQ

• 作 者: Qi Fu Kun Zhu Yuan-Rong Lu Zhi Wang Shu-Li Gao Fang-Jian Jia Yuan He
• 机 构: State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China“,”I
• 出 处: 核技术（英文版）
• 发表日期: 2018年11期
• 关键词: CW RFQ Cold model RF measurement Magnetic coupling window

A 50 mA CW deuteron RFQ is being built for a joint 973 project between Peking University and the Institute of Mode Physics. This RFQ adopts a high-fre-quency window-type structure. To study its RF properties and to validate the reliability of an electromagnetic simu-lation, two full-length aluminum models with tuners were built in succession. RF measurements were obtained from the test bench and compared to the simulations, including frequencies, quality factors, and electric fields of different modes and the field in aperture. Through field tuning, the maximal field unflatness for a single quadrant and the average asymmetry of four quadrants were reduced from 8.7％ and ± 3.6％ to 5.8％ and ± 1.7％, respectively. Moreover, a tuning method of adjusting the gap distance between the endplates and the vanes was also studied in this paper.