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arXiv physics/0008095physics.acc-ph
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SNS直线加速器的束流位置-相位匹配

Beam Position-Phase Monitors for SNS Linac

Sergey S. Kurennoy

摘要:

利用MAFIA对空间中子源直线加速器的组合束流位置-相位监测器进行了电磁建模。时域3-D模拟用于计算给定处理频率(402.5 MHz或805 MHz)的BPPM电极上的信号幅度和相位,作为射束横向位置的函数。利用来自所有BPPM电极的求和信号工作提供了精确测量射束相位的良好方式。虽然对于离轴波束,各个电极上的信号相位可以与中心波束的信号相位相差几度,但是发现求和信号的相位与设备内部的波束横向位置无关。根据分析结果,选择了具有4个一端短路的60度电极的最佳BPPM设计。它为位置和相位测量提供了良好的线性度和足够的信号功率,同时满足直线加速器的几何约束和机械要求。

英文摘要:

Electromagnetic modeling with MAFIA of the combined beam position-phase monitors (BPPMs) for the Spallation Neutron Source (SNS) linac has been performed. Time-domain 3-D simulations are used to compute the signal amplitudes and phases on the BPPM electrodes for a given processing frequency, 402.5 MHz or 805 MHz, as functions of the beam transverse position. Working with a summed signal from all the BPPM electrodes provides a good way to measure accurately the beam phase. While for an off-axis beam the signal phases on the individual electrodes can differ from those for a centered beam by a few degrees, the phase of the summed signal is found to be independent of the beam transverse position inside the device. Based on the analysis results, an optimal BPPM design with 4 one-end-shorted 60-degree electrodes has been chosen. It provides a good linearity and sufficient signal power for both position and phase measurements, while satisfying the linac geometrical constrains and mechanical requirements.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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