Design of the wall current monitor system at CSNS rapid cycling synchrotron
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摘要: 在中国散裂中子源工程中, 快循环同步加速器负责将剥离注入的能量为80MeV的质子束加速至1.6GeV后引出。在快循环同步加速器上共安装了两台壁电流探测器, 用来观测束流从注入至引出过程中束团在时域上的变化情况。详细介绍了壁电流探测器在陶瓷间隙、磁性材料和匹配电阻等方面的设计考虑, 以达到带宽满足百kHz到30 MHz的设计目标, 并对实际带束流测量结果进行分析讨论。经实际在线运行测试, 此壁电流探测器完全满足束流调试及运行需要。Abstract: Wall current monitors (WCMs) were designed and built for the rapid cycling synchrotron (RCS) of China Spallation Neutron Source (CSNS).The WCMs are used to measure longitudinal bunch shapes in the macro and micro view, calculate longitudinal emittance, and diagnose beam instabilities.The key parameters (e.g., size of the ceramic gap, selection of the resistor and the magnetic materials) of designing a WCM are discussed in this article.The bandwidth of the RCS-WCM can be up to 500 MHz during the lab test, while 30 MHz is required for online operation.The WCM system performed quite well during the beam commissioning and the normal operation of the RCS, beam injection, macro envelope of the accelerating period, and the shape of a single bunch can be observed clearly and accurately.
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表 1 CSNS-RCS主要参数
Table 1. Key parameters of CSNS-RCS
circumference/m pulse repetition rate/Hz beam energy/GeV bunch length/ns cycling period/μs 227.92 25 0.08~1.6 500~90 1.957~0.819 -
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