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中国散裂中子源(CSNS)的快循环同步加速器(RCS)是一台强流质子加速器,其束流平均功率达到100kW。在此强流加速器中,真空部件的阻抗是引起束流不稳定的主要原因,它严重限制了束流强度及品质。对CSNS/RCS设计中的各种真空部件阻抗进行了详细计算,并以计算结果为出发点,理论分析了各种不稳定性强弱,确定了各种不稳定性发生的阻抗阈值,为真空部件结构设计提供了参考。对比较严重的电阻壁阻抗,采用阻抗壁尾场模型进行跟踪模拟,得到不稳定性增长率与理论计算值符合较好。自然色品有助于束流稳定,加入自然色品后模拟,电阻壁不稳定性消失。
The fast circulating synchrotron (RCS) from China’s spallation neutron source (CSNS) is a strong-flow proton accelerator with an average beam power of 100 kW. In this high-current accelerator, the impedance of the vacuum part is the main cause of the instability of the beam, which severely limits beam intensity and quality. The impedance of various vacuum components in CSNS / RCS design was calculated in detail. Based on the calculation results, the various instabilities were analyzed theoretically, and the impedance thresholds of various instabilities were determined. For the vacuum components Structure design provides a reference. For the more serious resistive wall impedance, the impedance wake-wake model is used to simulate the model. The increase rate of instability is in good agreement with the theoretical value. Natural color products help to stabilize the beam, after adding natural color goods simulation, resistance wall instability disappears.