通过理论分析研究了电磁耦合型束流位置探测器(BPM)用于束流寿命测量的可行性, 并在上海光源储存环上进行了束流实验, 对其性能进行了评估。实验结果表明, 与目前常用的直流流强变压器(DCCT)系统相比, BPM给出的束流寿命具有更高的带宽和分辨力, 有利于进行不同时间尺度的束流寿命评估, 而且可以通过多个平均的方式来进一步提高测量精度。

The output signal of beam position monitor (BPM) carries not only position information but also charge information. It can reflect the changes of the beam charge and be used for beam lifetime measurement. In this paper, the feasibility of beam lifetime measurement using BPM was investigated through theoretical analysis. Some experiments were conducted on the storage ring of Shanghai Synchrotron Radiation Facility(SSRF) to evaluate the performance. Compared with the DC current transformer(DCCT) system, the lifetime measured by BPM has higher data rate and resolution. It is useful for the beam lifetime eva-luation of different time scales and the measurement accuracy can be further improved by averaging the results of multiple BPMs.