正交对称型束流位置监测器电极增益测量新方法
A new measurement method of electrode gains for orthogonal symmetric type beam position monitor
摘要：
合肥光源二号改造工程注入器的束流位置监测器（BPM）系统有19个带状线束流位置监测器。大多数由四个正交对称的带状线电极组成。电子增益和加工误差的差异会引起BPM电极的电子束响应的变化。这种变化将耦合两个测量的水平位置，以带来测量误差。为了减轻这种影响，一种新的技术来测量四个电极的相对响应已经开发出来。它与束流电荷无关，相关系数可以从理论上计算出来。分析了电极耦合对该技术的影响。校准数据用于拟合所有19个注入器射束位置监测器的增益。结果表明，测量增益分布的标准偏差约为5%。
英文摘要：
The new beam position monitor (BPM) system of the injector at the upgrade project of Hefei Light Source (HLS II) has 19 stripline beam position monitors. Most consist of four orthogonal symmetric stripline electrodes. The differences in electronic gain and mismachining tolerance can cause the change of the beam response of the BPM electrodes. This variation will couple the two measured horizontal positions in order to bring the measuring error. To alleviate this effect, a new technique to measure the relative response of the four electrodes has been developed. It is irrelevant to the beam charge and the related coefficient can be theoretical calculated. The effect of electrodes coupling on this technique is analyzed. The calibration data is used to fit the gain for all 19 injector beam position monitors. The results show the standard deviation of the distribution of measured gains is about 5%.
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