CSNS/RCS中主要阻抗元件的仿真计算研究  

Impedance Computation of Main Components in CSNS/RCS

作　　者：李勇[1] 王娜[1] 刘瑜冬[1] 李志平[1] 施华[1] 黄良生[1] 王生[1] 

机构地区：[1]中国科学院高能物理研究所,北京100049

出　　处：《原子能科学技术》2012年第B09期526-529,共4页Atomic Energy Science and Technology

摘　　要：中国散裂中子源(CSNS)快循环同步加速器(RCS)是强流质子加速器,对环中真空元件的阻抗研究是判断束流能否稳定运行的重要依据。通过正确估算环中元件阻抗,可及时对元件的阻抗进行有效控制和防止束流不稳定性发生,从而减小束流损失。本文利用CST电磁场仿真软件给出了RCS环中高频腔及准直器的耦合阻抗,并探讨了bus-bar结构对高频腔本身及束流稳定的影响,发现需重新设计bus-bar结构使腔固有频率大于10MHz才能彻底解决因共振可能引起的丢束。此外,计算表明,主准直器屏蔽有利于减小耦合阻抗及损失功率,在安装代价较小的情况下需对主准直器进行屏蔽。The Rapid Cycling Synchrotron （RCS） of the China Spallation Neutron Source （CSNS） is a high intensity proton accelerator. The study on the coupling impedance in the ring plays an important role in the stability of the beams. The total impedances of the ring and the occurrence of the beam instability can be controlled by evaluating of the coupling impedance accurately. The impedances of some main components in the RCS ring, such as RF cavities and collimator were calculated by using numerical simulation. The impact of bus-bar＇s configura- tion on RF cavities and beams was estimated by impedance calculation. To solve resonance thoroughly, the inherent frequency should be more than 10 MHz by designing bus-bar＇s struc- ture again. Furthermore, the RF shield of primary collimator was introduced, which shows a significant reduction of both the longitudinal coupling impedances and the loss power with small installation cost.

关 键 词：中国散裂中子源 耦合阻抗 高频腔 主准直器 屏蔽 

分 类 号：O572.212[理学—粒子物理与原子核物理]