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| A fast luminosity monitor for BEPCⅡ | |
| 作者单位： | XUE Zhen(Laboratory of High Energy Physics, Department of Modern Physics, University of Science and Technology of China,Hefei 230026, China ;Institute of High Energy Physics, CAS, Beijing 100049, China);WANG Yi-Fang,HU Tao,CAI Xiao(Institute of High Energy Physics, CAS, Beijing 100049, China);SHAN Qing,XU Zi-Zong,WANG Xiao-Lian,WU Jian(Laboratory of High Energy Physics, Department of Modern Physics, University of Science and Technology of China,Hefei 230026, China);WANG Yong-Gang,ZHANG Tao(Laboratory of Fast Electronics, Department of Modern Physics, University of Science and Technology of China,Hefei 230026, China) |
| 基金项目： | 北京正负电子对撞机国家实验室重点课题资助 |
| 摘 要： | 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:sxe+ =sxe-=0.356 mm,sye+ =sye-=0.011 mm. |
| 收稿时间： | 2010-04-05 |
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