Abstract
A small pulse tube refrigerator with a cooling power of 70 W at 165 K was designed, fabricated and tested. It is used for recondensing xenon gas in a liquid xenon photon detector. A type of the pulse tube refrigerator is a co-axial one with an inside regenerator configuration for the space-saving and easy fabrication. The cooling power was tested both with a simple-orifice and a double-inlet phase shift configuration and found that the cooling power at around 165 K was almost the same in this proto-type refrigerator. This refrigerator was then installed in the 100 L large-proto liquid xenon calorimeter and operated for 18 days for recondensing evaporated xenon gas without liquid nitrogen.
