Thermoacoustically driven pulse tube cooler below 60 K

Modifications of hot-end heat exchanger, water cooler, hot buffer and acoustic pressure amplifier were carried out to improve the performance of a standing-wave thermoacoustic engine. A U-shaped pulse tube cooler was designed and fabricated according to the operating parameters of the engine. Experimental results of the pulse tube cooler driven by the modified thermoacoustic engine indicate that the pressure ratio has been increased from 1.152 to 1.179, and the cooling temperature has been dropped from 79.7 K to 56.4 K.