Design and verification of a new multiharmonic feedback control system for CSNS-II RCS  

作　　者：Jian Wu Xiang Li Bin Wu Yang Liu Chun-Lin Zhang Wei Long Jun-Yu Zhu Sheng-Hua Liu Zhi-Jun Lu Sheng-Yi Chen Xiao Li 

机构地区：[1]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Spallation Neutron Source Science Center,Dongguan 523803,China

出　　处：《Nuclear Science and Techniques》2025年第4期82-91,共10页核技术(英文)

基　　金：supported by the National Natural Science Foundation of China(Nos.11875270 and 12205317);the Youth Innovation Promotion Association,Chinese Academy of Sciences(No.2018015)。

摘　　要：A dual-harmonic acceleration system is utilized to mitigate the space-charge effect in the rapid-cycling synchrotron of the China Spallation Neutron Source upgrade project(CSNS-II).A magnetic alloy(MA)-loaded cavity with a high accelerating gradient is developed to satisfy the requirements of dual-harmonic acceleration and provide the necessary second-harmonic cavity voltage.However,the MA-loaded cavity exhibits a wideband frequency response,resulting in numerous higher harmonics in the radio-frequency(RF)voltage.These higher harmonics are caused by both the beam-loading effect and distorted amplifier current,which distort the RF bucket,increase the power dissipation in the cavity,and lower the gradient.To address these issues,a multiharmonic independent feedback-control approach is implemented to compensate for higher harmonics.The effectiveness of this control strategy is validated experimentally.This study provides details regarding the feedback-control design and presents the commissioning results.

关 键 词：MA-loaded cavity Beam-loading effect Multiharmonic independent feedback control 

分 类 号：TG1[金属学及工艺—金属学]