Improvement of xenon purification system using a combination of a pulse   tube refrigerator and a coaxial heat exchanger
  We have developed a compact cryogenic system with a pulse tube refrigerator and a coaxial heat exchanger. This liquefaction-purification system not only saves the cooling power used to reach high gaseous recirculation rate, but also reduces the impurity level with high speed. The heat exchanger operates with an efficiency of 99%, which indicates the possibility for fast xenon gas recirculation in a highpressurized large-scale xenon storage with much less thermal losses. 
Wan-Ting Chen, D. Chbib, J.-P. Cussonneau, J. Donnard, S. Duval, O.   Lemaire, M. Le Calloch, P. Le Ray, A.-F. Mohamad-Hadi,...
astro-ph.IM physics.ins-det