同步加速器Barrier Bucket高频电压的研究  

Research on barrier bucket voltage in synchrotron

作　　者：梁路[1,2] 许哲 金鹏[1] 王春晓[1] 仪孝平[1] 

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

出　　处：《强激光与粒子束》2016年第12期136-139,共4页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11505252)

摘　　要：同步加速器Barrier Bucket高频系统用于克服空间电荷效应的影响,并对束团进行预压缩从而实现束团的多次累积来提高束流的流强。实现Barrier Bucket束流多次累积,要求在同步环高频加速腔上产生一个单正弦电压信号。针对单正弦波形的特点,讨论在同轴加载腔上产生该电压波形的方法和条件。通过对单正弦信号的频谱分析得出信号对加速腔高频系统的带宽要求,运用等效并联电路的方法并将同轴加载腔作线性时不变近似,求出输出的腔体电压与输入的激励电流间的关系。Barrier Bucket电压信号对加速腔整个高频系统的带宽要求至少应为单正弦频率的两倍。输入的激励电流为单正弦信号的基础上叠加上一个直流脉冲偏置,偏置大小为腔体Q值。最后,根据分析的结果在兰州重离子加速器冷却储存实验环(CSRe)高频系统的铁氧体加载腔和新研制的磁合金加载腔系统上进行测试,并对测试结果作相关讨论。Barrier bucket （BB） is used to enhance the intensity of the beam current by accumulation repeatedly in synchrotron. It can overcome the influence of space-charge effect. For realizing the beam accumulation repeatedly, it needs generating a singlesine voltage pulse in the accelerating cavity. Based on the single-sine waveforms characteristics, conditions and methods for generating barrier voltages are discussed in this paper. The bandwidth requirement of the signal is obtained according to the spectrum analysis of the signal,at the same time the relationship between the output voltage and the input excitation current is determined by using the method of equivalent parallel circuit and the linear time invariant approximation. The bandwidth requirement of the barrier RF signal is at least two times of the single sine frequency. The input excitation current is based on a single sinusoidal signal adding a DC pulse bias（the bias value equals to the Q value of cavity）. Based on the results of the analysis, the BB voltage test was carried out on both of the ferrite loaded cavity of the cooling storage experimental ring （CSRe） and the newly developed magnetic alloy cavity,and the test results are discussed.

关 键 词：BARRIER BUCKET 单正弦 频谱 同轴加载腔 线性时不变 傅里叶变换 

分 类 号：TL503.2[核科学技术—核技术及应用]