Abstract
ABSTRACT Experimental results of two-stage Gifford-McMahon cryorefrigerator are described. In prototype experiments, drive mechanism is Scotch Yoke type driven by stepping motor. Copper meshes and lead balls are used for regenerator's materials in the first stage and in the second stage, respectively. To find optimal conditions of the cryopump, no load temperature and refrigeration capacity according to the variation of cycle frequency and operating pressure are measured, and the cool down and load characteristics at partiular cycle frequencies are presented. In general, as the cycle frequency is lowered, no load temperature is dropped but refrigeration capacity is diminished. As the representative result, in a case that the cycle frequency is 70 rpm and steady state pressure is 14 atm, no load temperature of the second stage is lowered to 9.5 K in 55 minutes, and in this situation the refrigeration capacity of the first stage is 42 W at 80 K, that of the second stage is 11 W at 20 K.
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