Calculations of operating schemes for a passive harmonic cavity in HLS-Ⅱ  

作　　者：樊浩 吴丛凤 刘广超 

机构地区：[1]National Synchrotron Radiation Laboratory,University of Science and Technology of China

出　　处：《Chinese Physics C》2012年第9期895-899,共5页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China (10675116);Major State Basic Research Development Programme of China (2011CB808301)

摘　　要：A passive higher harmonic cavity （HHC） will be used in the Hefei Light Source II Project （HLS- II） to lengthen the bunch and consequently increase the beam lifetime dominated by Touschek scattering. The effects of constant voltage and constant detuning have been calculated and compared over the operating current from 0.4 to 0.2 A on the bunch lengthening for the passive normal conducting harmonic cavity system in HLS-II. The results show that the bunch shape has less change and the lifetime improvement factors are not less than 2.7 over the beam currents for the constant voltage case. The constant voltage operating scheme may be applied to our machine.A passive higher harmonic cavity （HHC） will be used in the Hefei Light Source II Project （HLS- II） to lengthen the bunch and consequently increase the beam lifetime dominated by Touschek scattering. The effects of constant voltage and constant detuning have been calculated and compared over the operating current from 0.4 to 0.2 A on the bunch lengthening for the passive normal conducting harmonic cavity system in HLS-II. The results show that the bunch shape has less change and the lifetime improvement factors are not less than 2.7 over the beam currents for the constant voltage case. The constant voltage operating scheme may be applied to our machine.

关 键 词：harmonic cavity lifetime improvement bunch length operating scheme 

分 类 号：TL503[核科学技术—核技术及应用]