INVESTIGTION ON THE 1.6 kg MINIATURE COAXIAL PULSE TUBE CRYOCOOLER

Increasing the drive frequency can yield a more compact pulse tube cooler, which is very attractive for many applications, especially for the space and military applications. In this paper, experimental study has been carried out for a coxial pulse tube cryocooler which is driven by self-designed linear compressor and uses an inertance tube with a reservoir and double-inlet value as the phase shifter. The pulse tube cryocooler has achieved cooling capacity of 2.12 W at 80K with the input power of 45 W, around of 13% relative Carnot efficiency is achieved at 80 K when the reject temperature is 300 K. Because of the low mass and the high operating frequency, the temperature of the cold end can decrease to 80 K from 300 K in two minutes and the gravity has little effects on the temperature.