Measurement of photoelectron yield of the CDEX-10 liquid argon detector prototype

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Qing-Hao Chen, Qian Yue, Jian-Ping Cheng, Ke-Jun Kang, Yuan-Jing Li, Shin-Ted Lin, Chang-Jian Tang, Hao-Yang Xing, Xun-Zhen Yu, Ming Zeng and Jing-Jun Zhu. Measurement of photoelectron yield of the CDEX-10 liquid argon detector prototype[J]. Chinese Physics C, 2016, 40(11): 116002. doi: 10.1088/1674-1137/40/11/116002
Qing-Hao Chen, Qian Yue, Jian-Ping Cheng, Ke-Jun Kang, Yuan-Jing Li, Shin-Ted Lin, Chang-Jian Tang, Hao-Yang Xing, Xun-Zhen Yu, Ming Zeng and Jing-Jun Zhu. Measurement of photoelectron yield of the CDEX-10 liquid argon detector prototype[J]. Chinese Physics C, 2016, 40(11): 116002.  doi: 10.1088/1674-1137/40/11/116002 shu
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Received: 2016-01-31
Revised: 2016-03-23
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Measurement of photoelectron yield of the CDEX-10 liquid argon detector prototype

    Corresponding author: Qing-Hao Chen,
    Corresponding author: Hao-Yang Xing,
  • 1. Department of Engineering Physics, Tsinghua University, Beijing 100084, China
  • 2. Key Laboratory of Particle and Radiation Imaging, Tsinghua University, Ministry of Education, Beijing 100084, China
  • 3.  College of Physical Science and Technology, Sichuan University, Chengdu 610064, China

Abstract: The China Dark Matter Experiment (CDEX) is a low background experiment at China Jinping Underground Laboratory (CJPL) designed to directly detect dark matter with a high-purity germanium (HPGe) detector. In the second phase, CDEX-10, which has a 10 kg germanium array detector system, a liquid argon (LAr) anti-Compton active shielding and cooling system is proposed. To study the properties of the LAr detector, a prototype with an active volume of 7 liters of liquid argon was built and operated. The photoelectron yields, as a critically important parameter for the prototype detector, have been measured to be 0.051-0.079 p.e./keV for 662 keV γ rays at different positions. The good agreement between the experimental and simulation results has provided a reasonable understanding and determination of the important parameters such as the surviving fraction of the Ar2* excimers, the absorption length for 128 nm photons in liquid argon, the reflectivity of Teflon and so on.

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