Measurement of emittance at CSNS ion source without analyzing magnet

作     者：Shengjin Liu Yongjia Lv Fang Li Huafu ouyang Yongchuan Xiao Kangjia Xue Xiuxia Cao Weidong Chen Ruiyang Qiu Shunming Liu Hui Li Renli Zhu Shengjin Liu;Yongjia Lv;Fang Li;Huafu ouyang;Yongchuan Xiao;Kangjia Xue;Xiuxia Cao;Weidong Chen;Ruiyang Qiu;Shunming Liu;Hui Li;Renli Zhu

作者机构：Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science CenterDongguan 523803.China 

出 版 物：《Radiation Detection Technology and Methods》 (辐射探测技术与方法（英文）)

年 卷 期：2022年第6卷第2期

页      面：209-213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] 

基　　金：supported by the Program of National Natural Science Foundation of China Grant No.11875271 

主　　题：CSNS ion source Beam emittance High current pulse beam Analyzing magnet 

摘      要：Purpose High current beam is required for CSNS update in *** 50 mA H-will be designed to deliver to the linac in CSNSⅡ.For the present state of CSNS ion source,the beam emittance cannot satisfy the requirement of RFQ entrance at the 50 mA *** order to improve the beam quality,CSNS ion source is required further *** Simulation shows emittance growth due to the space charge force in the intense H-beam when the beam transports through the analyzing *** considering the neutralization of space charge,the emittance growth could be *** analyzing magnet thus is considered to removed,which might destroy the neutralization of space *** beam emittance is measured at the revised CSNS ion *** Measured results show that beam emittance without the analyzing magnet becomes smaller than that of CSNS ion *** the requirement of 0.2πmm mrad,beam current is larger than 30 *** reveals that analyzing magnet could destroy space charge neutralization and result in the significant increase of *** Although the results presented are preliminary,it is important to improve the beam *** paper details the ion source improvement and measurement process.