CSRm变谐波加速
Beam acceleration with changing harmonic in CSRm
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摘要: 在研究兰州重离子冷却储存环(HIRFL-CSR)纵向相振荡运动特性的基础上，对主环(CSRm)内重离子的加速过程进行了模拟研究。选取由扇聚焦回旋加速器（SFC）剥离注入的能量为7 MeV/u，动量散度为±0.5%的12C6+典型离子，模拟了CSRm内束流的加速过程，加速的最终能量为1 GeV/u。在加速过程中采用了变换谐波的方式，解决了较低能量下的加速问题。模拟结果给出了不同时刻粒子在纵向相空间的分布以及各主要高频参数随时间的变化曲线。Abstract: Particles with low energy can not be accelerated only with harmonic number of 1 because of a restriction of the frequency range of the CSRm RF cavities with 0.25 to 1.7 MHz. This paper just simulated and studied the beam acceleration process of HIRFL-CSR. By means of changing harmonic, i.e. particles were captured and aecelerated to some energy with harmonic number of 2 first and then to the final energy with harmonic number of 1. The main RF parameters of CSRm and some beam parameters are given according to the simulation. In addition, the changing of particle distribution in longitudinal phase space during the accelerating process has been obtained.
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