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Description
Miniaturization of pulse tube cryocoolers is required for some particular applications, where size and mass for devices are limited, especially in the area of space technology. The high frequency operation leads to reduced pulse tube cryocooler volume for a given cooling power. So the high frequency pulse tube cryocoolers have high energy density and compact structure. Aiming at improving the operating frequency of pulse tube cryocooler, analysis on the difference between 40Hz and 80Hz is worked out. Such as the phasor between mass flow rate and pressure wave, the pressure loss, heat loss etc. Then a shorter regenerator and pulse tube are designed and manufactured. The experimental optimization on the length of regenerators, charging pressure, regenerator matrixes and the combination of inertance tubes are presented. In the end, a cooling power of 10 W at 80 K and a no-load temperature of 40 K are obtained with an input electrical power of 250W, and achieves around 11% of Carnot efficiency at 80K.
