Experimental Research of 300 Hz Pulse Tube Cryocoolers

This paper describes pulse tube cryocoolers (PTCs) that operate at 300¶Hz and aim at reaching temperatures as low as 80¶K. Two kinds of PTCs have been fabricated, tested and compared: in-line and coaxial. Different aspects of the performance of the PTCs have been investigated, especially the effect of the phase shifter. Unlike the conventional orifice valve, a fixed double-inlet nozzle has been used to shift the phase, as well as an inertance tube. A thermoacoustic driver was adopted as the pressure oscillator, supported by the thermoacoustic group of Dr. Luo of TIPC/CAS. After a series of optimization experiments, the in-line cooler reached 79.7¶K and lifted about 1¶W at 120¶K with an inlet pressure wave amplitude of about 0.18¶MPa at a filling pressure of 4.0 MPa