超流動ヘリウム生成用磁気冷凍機の基礎的検討

抄録

We have designed and manufactured a reciprocating magnetic refrigerator (Carnot cycle) operating between 1.8K and 4.2K. The magnetic refrigerant was gadolinium gallium garnet (GGG). Operating tests were carried out varying maximum applied magnetic field B_m and operating frequency f. The experimental B_m and f dependence of useful cooling power showed good agreement with the calculated results. The maximum useful cooling power was 0.50W at 1.80K for B_m=3.0T and f=0.45Hz.