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| A fast luminosity monitor for BEPCⅡ | |
| 作者姓名： | 薛镇 单卿 许咨宗 汪晓莲 伍健 王永纲 章涛 胡涛 蔡啸 王贻芳 |
| 作者单位： | Laboratory of High Energy Physics, Department of Modern Physics,;University of Science and Technology of China, Hefei 230026, China; Laboratory of Fast Electronics, Department of Modern Physics,;University of Science and Technology of China, Hefei 230026, China; Institute of High Energy Physics, CAS, Beijing 100049, China |
| 基金项目： | Supported by BEPC National Laboratory (BEPCⅡ-UDEC-326-HT193/2004) |
| 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 BEPC Ⅱ to measure the relative luminosity bunch by bunch for the first time and used successfully in beam tuning of BEPC Ⅱ. 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. |
| 关 键 词： | BEPCⅡ 监测 亮度 辐射发射 阈值能量 显示器 γ光子 光度 |
| 收稿时间： | 2009-05-15 |
| 修稿时间： | 2009-06-10 |
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