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针对合肥光源高亮度注入器设计了一种四轴对称八条带电极束流能散检测器(BESM),以实现束流能散的非拦截测量。理论推导了从BESM电信号中提取束流横向尺寸分量的公式。通过对BESM的灵敏度、阻抗匹配、电极的时域频域响应等的分析,确定了BESM的电极张角、半径、长度等各方面的物理参数。通过天线法对BESM进行了位置和四极分量的标定,得到了电中心相对于机械中心的偏移、 BESM的位置灵敏度和四极分量灵敏度等参数。通过对多组电信号和位置信号的处理拟合出了机械位置与对数比电位置信号的相关多项式,并给出了四极分量关于束流横向尺寸、束流中心位置以及它们高次项的经验公式。 相似文献
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The new beam position monitor (BPM) system of the injector at the upgrade project of the Hefei Light Source (HLS Ⅱ) has 19 stripline beam position monitors. Most consist of four orthogonally symmetric stripline electrodes. Differences in electronic gain and mismachining tolerance can cause changes in the beam response of the BPM electrodes. This variation will couple the two measured horizontal positions, resulting in measuring error. To alleviate this effect, a new technique to measure the relative response of the four electrodes has been developed. It is independent of the beam charge, and the related coefficient can be calculated theoretically. The effect of electrode 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%. 相似文献