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XUE Zhen, XU Zi-Zong, WANG Xiao-Lian, HU Tao, WANG Zhi-Yong, FU Cheng-Dong, YAN Wen-Biao, ZHOU Li, CAI Xiao, YU Bo-Xiang, FANG Jian, SUN Xi-Lei, SHI Feng, WANG Zhi-Gang, AN Zheng-Hua, SUN Li-Jun, LIU Hong-Bang, ZHANG Ai-Wu, WANG Xiao-Dong and Luminosity monitoring and calibration of BLM[J]. Chinese Physics C, 2011, 35(1): 1-5. doi: 10.1088/1674-1137/35/1/001
XUE Zhen, XU Zi-Zong, WANG Xiao-Lian, HU Tao, WANG Zhi-Yong, FU Cheng-Dong, YAN Wen-Biao, ZHOU Li, CAI Xiao, YU Bo-Xiang, FANG Jian, SUN Xi-Lei, SHI Feng, WANG Zhi-Gang, AN Zheng-Hua, SUN Li-Jun, LIU Hong-Bang, ZHANG Ai-Wu, WANG Xiao-Dong and Luminosity monitoring and calibration of BLM[J]. Chinese Physics C, 2011, 35(1): 1-5.  doi: 10.1088/1674-1137/35/1/001 shu
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Received: 2010-04-23
Revised: 2010-05-18
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Luminosity monitoring and calibration of BLM

Abstract: The BEPCⅡ Luminosity Monitor (BLM) monitors relative luminosity per bunch. The counting rates of gamma photons, which are proportional to the luminosities from the BLM at the center of mass system energy of the ψ(3770) resonance, are obtained with a statistical error of 0.01% and a systematic error of 4.1%. Absolute luminosities are also determined by the BESⅢ End-cap Electro-Magnetic Calorimeter (EEMC) using Bhabha events with a statistical error of 2.3% and a systematic error of 3.5%. The calibration constant between the luminosities obtained with the EEMC and the counting rates of the BLM are found to be 0.84±0.03 (×1026 cm-2·count-1). With the calibration constant, the counting rates of the BLM can be scaled up to absolute luminosities.

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