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 

机构地区：[1]State Key Laboratory of Nuclear Physics and Technology,Peking University [2]Institute of Modern Physics,China Academy of Science

出　　处：《Nuclear Science and Techniques》2018年第11期194-200,共7页核技术（英文）

基　　金：supported by the National Basic Research Program of China(No.2014CB845503)

摘　　要：A 50 mA CW deuteron RFQ is being built for a joint 973 project between Peking University and the Institute of Modern Physics. This RFQ adopts a high-frequency window-type structure. To study its RF properties and to validate the reliability of an electromagnetic simulation, 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.A 50 mA CW deuteron RFQ is being built for a joint 973 project between Peking University and the Institute of Modern Physics. This RFQ adopts a high-frequency window-type structure. To study its RF properties and to validate the reliability of an electromagnetic simulation, 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.

关 键 词：CW RFQ COLD model RF measurement MAGNETIC COUPLING WINDOW 

分 类 号：TL[核科学技术]