A 15 [email protected] K lightweight Pulse Tube Cryocooler operating at 94 Hz

Abstract In previous research, we have developed a high frequency lightweight pulse tube cryocooler, which can obtain a cooling capacity of 10 W at 80 K at the operating frequency of 126 Hz and input power of 250 W. Recently, we further improved the performance of this pulse tube cryocooler by optimizing the phase shifter and changing the cold finger structure. In this paper, the parameters of the optimized pulse tube cryocooler are introduced and tested. This pulse tube cryocooler has a total weight of 4.2 kg, a cold finger diameter of 25.4 mm and a length of 48 mm. The regenerator is filled with #635 stainless steel screens. With an operating frequency of 94 Hz, input power of 250 W, hot end temperature of 300 K and the charge pressure of 6 MPa, a minimum temperature of 35.5 K and a cooling capacity of 15 W at 76.8 K can be achieved. The relative Carnot efficiency is 17.4%.