Abstract
Because of employment of highly advanced earth observation sensors and employment of superconducting devices for communication equipment, number of missions with multi-cryocoolers tends to increase. Therefore, it is necessary to establish fundamental researches for space cryocooler development of small lightweight, high performance, high reliance, and a long-life. As the cooling system which responds to such a background, thermoacoustic devices attract attention. The attempt that uses a thermoacoustic engine for the pressure wave source of a pulse tube refrigerator is suggested, and if realized, application in space field is expected. In general, thermal compressors need a long resonance tube. Therefore, the system which operates solid displacer as resonator instead of a resonance tube was proposed. Though a great miniaturization of the device was achieved by adopting displacers, power loss in a displacer part became large, and a result which causes decline in efficiency was brought. Then, in this paper, the influence of displacer piston weight was investigated using three kinds pf displacers.
