Status report towards implementation of a Compton polarimeter at BEPCII
Mengyu Su, Zhe Duan, Jie Gao, Qingfu Han, Daheng Ji, Dazhang Li, Qi Li, Xiaodong Li, Yanchun Li, Zhijun Liang, Ge Lei, Zhonghui Ma, Aur\'elien Martens, Lingling Men, Xianjing Sun, Guangyi Tang, Huan Wang, Jianli Wang, Lin Wang, Qi Yang, Lingda Yu, Chenghui Yu, Jianyong Zhang
TL;DR
This paper reports on the design, current status, and future prospects of a Compton polarimeter for measuring electron beam polarization at BEPCII, aiming to support high-energy collider physics experiments.
Contribution
It presents the development and commissioning status of a Compton polarimeter at BEPCII, including initial observations and plans for future polarization measurements.
Findings
Unambiguous observation of Compton interaction achieved
Current setup has limitations discussed in the report
Prospects for future polarization measurements outlined
Abstract
Precision beam polarization measurements based on Compton polarimeters are essential for the physics program of future high-energy colliders. In order to prepare for these and to extend the scope of physics measurements of the BESIII experiment at the BEPCII, a diagnostic of electron beam transverse polarization at BEPCII is of interest. The design and status report of the commissioning, until July 2025, of this device is reported in this paper. We report unambiguous observation of Compton interaction, discuss current limitations of the experimental setup and draw prospects for improvements and actual measurement of electron beam polarization in the near future.
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