WIMPs are a well-motivated galactic dark matter candidate. Liquid argon (LAr) is an attractive target for the direct detection of WIMPs. The LAr prototype detector is designed to study the technology and property of LAr detector. The prototype detector have an active volume containing 0.65 kg of liquid argon. The liquid nitrogen(LN) cooling system allows the temperature of liquid argon to be maintained at the boiling point (87.8 K) with fluctuations less than 0.1 K. The prototype was calibrated with a Na22 source, with the light yield 1.591±0.019 p.e./keV for the 511 keV gamma rays using the domestic-made argon purification system.
@article{arxiv.1601.01075,
title = {Preliminary test results of LAr prototype detector},
author = {Pei-Xian Li and Meng-Yun Guan and Chang-Gen Yang and Peng Zhang and Jin-Chang Liu and Yong-Pen Zhang and Cong Guo and Yi Wang},
journal= {arXiv preprint arXiv:1601.01075},
year = {2016}
}