BPM测量束流纵向发射度与Twiss参数  

Longitudinal Beam Parameters Measurement by Beam Position Monitors

作　　者：秦元帅 王志军[1] 冯驰 刘淑会[1] 窦为平 陈伟龙 王旺生 谢宏明 何源[1] QIN Yuanshuai;WANG Zhijun;FENG Chi;LIU Shuhui;DOU Weiping;CHEN Weilong;WANG Wangsheng;XIE Hongming;HE Yuan(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]中国科学院大学,北京100049

出　　处：《原子核物理评论》2021年第1期30-37,共8页Nuclear Physics Review

基　　金：NSAF联合基金(U1730122)。

摘　　要：在C-ADS直线加速器样机中,为了描述束流相空间分布,需要精确测量束流在RFQ出口处的参数。束流横向信息已通过发射度重构测量获得,束流光学也得到了验证。采用了一种用BPM的SUM信号测量束流纵向参数的方法。在实验中,调节两台聚束器的聚束腔压并记录其下游BPM上的SUM信号。通过粒子群算法和Trace Win模拟相结合的方法,得到了考虑空间电荷效应的测量结果。测得的发射度与Toutatis中的模拟值相近。To characterize the phase space distribution of the beam in C-ADS demo linac,beam parameters need to be measured with high accuracy at the exit of RFQ.Transverse information of the beam has been measured via the method of emittance reconstruction and the beam optics has been verified.A method has been adopted to measure beam longitudinal parameters by the SUM-signal of beam position monitors.The bunching voltage of the two bunchers and the SUM-signals in the downstream BPMs are recorded in the experiment.By combining the PSO(Particle Swarm Optimization)method with Trace Win simulation,the results are obtained with the consideration of space charge effect.The measured emittance is quite close to the simulated one in Toutatis.

关 键 词：纵向发射度测量 twiss参数 BPM 粒子群算法 

分 类 号：TL506[核科学技术—核技术及应用]