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中国散裂中子源(CSNS)加速器系统由80MeV的直线加速器和1.6GeV的快循环同步加速器(RCS)构成.CSNS第一阶段采用H~-剥离注入方法,将粒子数累积至1.88×10~(13).注入束流被涂抹在较大的横向相空间内,以减小空间电荷效应.粒子注入后,为了降低由空间电荷效果引起的工作点漂移和工作点弥散,束流分布的均匀性很重要.引入了评估束流分布均匀性的三个参数.为了抑制注入过程中束流发射度和束晕的增长,通过采用三维的模拟程序ORBIT,对不同的横向相空间涂抹方案进行了比较.同时还介绍了工作点、注入峰值流强和斩波调制比等因素对注入过程的影响.
China spallation neutron source (CSNS) accelerator system consists of 80MeV linear accelerator and 1.6GeV fast cycle synchrotron (RCS) .CSNS first phase using H ~ - stripping injection method, the number of particles accumulated to 1.88 × 10 ~ (13) The injected beam is smeared in the larger lateral phase space to reduce the space charge effect.After particle injection, in order to reduce the drift of working point and the dispersion of working point caused by space charge effect, the uniformity of beam distribution It is very important to introduce three parameters to evaluate the uniformity of the beam distribution.In order to restrain the beam emission and beam halo growth during the injection process, different lateral phase space smear schemes are compared by using three-dimensional simulation program ORBIT At the same time, the effects of working point, injection peak current and chopper modulation ratio on the injection process are also introduced.