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

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; Jing-Jun Zhu

doi:10.1088/1674-1137/40/11/116002

Chinese Physics C> 2016, Vol. 40> Issue(11) : 116002 DOI: 10.1088/1674-1137/40/11/116002

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

Qing-Hao Chen ^1,2,, ,
Qian Yue ^1,2 ,
Jian-Ping Cheng ^1,2 ,
Ke-Jun Kang ^1,2 ,
Yuan-Jing Li ^1,2 ,
Shin-Ted Lin ³ ,
Chang-Jian Tang ³ ,
Hao-Yang Xing ^3,, ,
Xun-Zhen Yu ³ ,
Ming Zeng ^1,2 ,
Jing-Jun Zhu ³

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

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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.
- dark matter ,
- liquid argon ,
- photoelectron yield ,
- wavelength shifter ,
- TPB

References

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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

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Received: 2016-01-31
Revised: 2016-03-23

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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

Received Date: 2016-01-31

Accepted Date: 2016-03-23

Available Online: 2016-11-05

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

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