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

ZOU Jun-Ying; WU Fang-Fang; YANG Yong-Liang; SUN Bao-Gen; ZHOU Ze-Ran; LUO Qing; LU Ping; XU Hong-Liang

doi:10.1088/1674-1137/38/12/127002

Chinese Physics C> 2014, Vol. 38> Issue(12) : 127002 DOI: 10.1088/1674-1137/38/12/127002

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

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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%.

References

[1]

ZOU Jun-Ying, YANG Yong-Liang, SUN Bao-Gen et al. Calibration of Beam Position Monitors in the Injector of HLS Ⅱ. Proceedings of IPAC2013. Shanghai, China, 2013. 568-570[2] Rubin D L, Billing M, Meller R et al. Phys. Rev. ST Accel. Beams, 2010, 13(9): 092802-1-092802-6[3] LI Peng, SUN Bao-gen, LUO Qing et al. High Power Laser and Particle Beams, 2008, 20(4): 573-578[4] Olmos A, Pérez F, Rehm G. Matlab Code for BPM Button Geometry Computation. Proceedings of DIPAC 2007. Venice, Itally, 2007. 186-188[5] ZOU Jun-Ying, FANG Jia, SUN Bao-Gen, et al. Application of Libera Brilliance Single Pass at NSRL Linac BPM System. Proceedings of IPAC2011. San Sebastián, Spain, 2013. 1284-1286

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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

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Received: 2014-01-02
Revised: 2014-03-03

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通讯作者: 陈斌, [email protected]

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Corresponding author: ZOU Jun-Ying,

Corresponding author: SUN Bao-Gen,

Received Date: 2014-01-02

Accepted Date: 2014-03-03

Available Online: 2014-12-05

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

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通讯作者: 陈斌, [email protected]

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