Requirement of the on/off ratio of superconducting heat switch used for the continuous stage of cADR

Abstract

Abstract As an important component of the adiabatic demagnetization refrigerator (ADR), the superconducting heat switch uses the different thermal conductivities of a metal in the normal state and the superconducting state to turn the heat switch on / off for the continuous stage. Switch ratio is an important parameter to evaluate the performance of a heat switch, which is related to many factors. Peter Kittel calculated the different switch ratio requirements in the single-stage and multi-stage ADR. Based on that, this paper focuses on the relationship between the required switch ratio and operating parameters of the ADR system, especially the ratio of the heat leak to the effective cooling power.