A fast luminosity monitor for BEPCⅡ

XUE Zhen; SHAN Qing; XU Zi-Zong; WANG Xiao-Lian; WU Jian; WANG Yong-Gang; ZHANG Tao; HU Tao; CAI Xiao; WANG Yi-Fang

doi:10.1088/1674-1137/34/4/013

Chinese Physics C> 2010, Vol. 34> Issue(4) : 487-491 DOI: 10.1088/1674-1137/34/4/013

A fast luminosity monitor for BEPCⅡ

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Abstract：
The fast luminosity monitor counting the γ photons above a given energy threshold emitted from radiative Bhabha scattering has been operated in the BEPCⅡ to measure the relative luminosity bunch by bunch for the first time and used successfully in beam tuning of BEPCⅡ. In the relative mode the monitor is able to deliver the relative luminosities with an accuracy of 0.8%. By steering the electron beam while observing the counting rate changes of the monitor the horizontal and vertical sizes of the bunch spots can be estimated as: s_xe+ =s_xe－=0.356 mm, s_ye+ =s_ye－=0.011 mm.

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XUE Zhen, SHAN Qing, XU Zi-Zong, WANG Xiao-Lian, WU Jian, WANG Yong-Gang, ZHANG Tao, HU Tao, CAI Xiao and WANG Yi-Fang. A fast luminosity monitor for BEPCⅡ[J]. Chinese Physics C, 2010, 34(4): 487-491. doi: 10.1088/1674-1137/34/4/013

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Received: 2009-05-15
Revised: 2009-06-10

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沈阳化工大学材料科学与工程学院沈阳 110142

A fast luminosity monitor for BEPCⅡ

Corresponding author: XUE Zhen,

Received Date: 2009-05-15
Accepted Date: 2009-06-10
Available Online: 2010-04-05

Abstract:

The fast luminosity monitor counting the γ photons above a given energy threshold emitted from radiative Bhabha scattering has been operated in the BEPCⅡ to measure the relative luminosity bunch by bunch for the first time and used successfully in beam tuning of BEPCⅡ. In the relative mode the monitor is able to deliver the relative luminosities with an accuracy of 0.8%. By steering the electron beam while observing the counting rate changes of the monitor the horizontal and vertical sizes of the bunch spots can be estimated as: s_xe+ =s_xe－=0.356 mm, s_ye+ =s_ye－=0.011 mm.