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Electron cooling of a bunched ion beam in a storage ring

机译：电子冷却储存环中的离子束束

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A combination of electron cooling and rf system is an effective method to compress the beam bunch length in storage rings. A simulation code based on multiparticle tracking was developed to calculate the bunched ion beam cooling process, in which the electron cooling, intrabeam scattering (IBS), ion beam space-charge field, transverse and synchrotron motion are considered. Meanwhile, bunched ion beam cooling experiments have been carried out in the main cooling storage ring (CSRm) of the Heavy Ion Research Facility in Lanzhou, to investigate the minimum bunch length obtained by the cooling method, and study the dependence of the minimum bunch length on beam and machine parameters. The experiments show comparable results to those from simulation. Based on these simulations and experiments, we established an analytical model to describe the limitation of the bunch length of the cooled ion beam. It is observed that the IBS effect is dominant for low intensity beams, and the space-charge effect is much more important for high intensity beams. Moreover, the particles will not be bunched for much higher intensity beam. The experimental results in CSRm show a good agreement with the analytical model in the IBS dominated regime. The simulation work offers us comparable results to those from the analytical model both in IBS dominated and space-charge dominated regimes.
机译：电子冷却和射频系统的组合是压缩存储环中束束长度的有效方法。开发了基于多粒子跟踪的仿真程序来计算束状离子束的冷却过程，其中考虑了电子冷却，束内散射（IBS），离子束空间电荷场，横向运动和同步加速器运动。同时，在兰州重离子研究设施的主储冷环（CSRm）中进行了束离子束冷却实验，以研究通过冷却方法获得的最小束长，并研究最小束长的依赖性。关于梁和机器参数。实验显示了与仿真结果相当的结果。基于这些模拟和实验，我们建立了一个分析模型来描述冷却离子束束长度的限制。可以看出，IBS效应在低强度光束中占主导地位，而空间电荷效应对于高强度光束则更为重要。而且，对于更高强度的光束，粒子不会聚束。 CSRm中的实验结果与IBS主导体制中的分析模型具有很好的一致性。仿真工作为我们提供了与IBS主导和空间电荷主导状态下的分析模型可比的结果。

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