A new measurement method for electrode gain in an orthogonally symmetric beam position monitor

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ZOU Jun-Ying, WU Fang-Fang, YANG Yong-Liang, SUN Bao-Gen, ZHOU Ze-Ran, LUO Qing, LU Ping and XU Hong-Liang. A new measurement method for electrode gain in an orthogonally symmetric beam position monitor[J]. Chinese Physics C, 2014, 38(12): 127002. doi: 10.1088/1674-1137/38/12/127002
ZOU Jun-Ying, WU Fang-Fang, YANG Yong-Liang, SUN Bao-Gen, ZHOU Ze-Ran, LUO Qing, LU Ping and XU Hong-Liang. A new measurement method for electrode gain in an orthogonally symmetric beam position monitor[J]. Chinese Physics C, 2014, 38(12): 127002.  doi: 10.1088/1674-1137/38/12/127002 shu
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Received: 2014-01-02
Revised: 2014-03-03
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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A new measurement method for electrode gain in an orthogonally symmetric beam position monitor

    Corresponding author: ZOU Jun-Ying,
    Corresponding author: SUN Bao-Gen,

Abstract: 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%.

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