MULTISTAGED PULSE TUBE REFRIGERATOR FOR SUPERCONDUCTING MAGNET APPLICATIONS

This paper describes the experimental results of the pulse tube refrigerator which could be used for the cooling system of the superconducting magnet. In 1993, we developed three-staged pulse tube refrigerator which has a cooling capacity of 100 mW at 4.8 K and the minimum attainable temperature of 3.6 K, and single stage pulse tube refrigerator which has a cooling capacity of 15 W at 80 K and the minimum attainable temperature of 22 K. These results indicate the possibility of the NbTi magnet cooling system combined with a pulse tube refrigerator which has no moving parts at the low temperature region, Design parameters and some preliminary test results are also given.