A 20-liter test stand with gas purification for liquid argon research

@article{Li2016A2T,
  title={A 20-liter test stand with gas purification for liquid argon research},
  author={Y. Li and C. Thorn and W. Tang and J. Joshi and X Qian and Milind Diwan and Steven Kettell and W. M. Morse and Triveni Rao and J. Stewart and Thomas Tsang and L. Zhang},
  journal={Journal of Instrumentation},
  year={2016},
  volume={11},
  pages={T06001 - T06001}
}
We describe the design of a 20-liter test stand constructed to study fundamental properties of liquid argon (LAr). This system utilizes a simple, cost-effective gas argon (GAr) purification to achieve high purity, which is necessary to study electron transport properties in LAr. An electron drift stack with up to 25 cm length is constructed to study electron drift, diffusion, and attachment at various electric fields. A gold photocathode and a pulsed laser are used as a bright electron source… 
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