An efficient cryogenic distillation system was designed and constructed for PandaX-4T dark matter detector based on the McCabe-Thiele (M-T) method and the conservation of mass and energy. This distillation system is designed to reduce the concentration of krypton in commercial xenon from 5X10−7 mol/mol to 10−14 mol/mol with 99% xenon collection efficiency at a maximum flow rate of 10 kg/h. The offline distillation operation has been completed and 5.75 tons of ultra-high purity xenon was produced, which is used as the detection medium in PandaX-4T detector. The krypton concentration of the product xenon is measured with an upper limit of 8.0 ppt. The stability and purification performance of the cryogenic distillation system are studied by analyzing the experimental data, which is important for theoretical research and distillation operation optimization.
@article{arxiv.2107.09398,
title = {Experimental Analysis of PandaX-4T Cryogenic Distillation System for Removing Krypton from Xenon},
author = {Rui Yan and Zhou Wang and Xiangyi Cui and Yonglin Ju and Haidong Sha and Shuaijie Li and Peiyao Huang and Xiuli Wang and Wenbo Ma and Yingjie Fan and Xiangdong Ji and Jifang Zhou and Changsong Shang and Liqiang Liu},
journal= {arXiv preprint arXiv:2107.09398},
year = {2022}
}