An Effective Cryostat Design of Conduction-Cooled HTS Magnets for a 300-kW-Class Superconducting Induction Heater

A superconducting magnet is operated under cryogenic conditions. To effectively design a cryostat for high-temperature superconducting (HTS) magnets, thermal loads-including conduction and radiation-should be minimized. These heat loads are closely related to the shape of both cryostat and HTS magnets, metal current lead, and cooling method used. A 300-kW-class superconducting induction heater (SIH) is being developed to design an effective cryostat. This paper presents two different cryostat designs (with different shapes) for conduction-cooled HTS magnets. The thermal stability of the HTS magnet was analyzed by considering heat generation and temperature increase and how these were related to quench phenomena. The cooling characteristics of single- and two-stage cryocoolers were analyzed and compared using the finite-element method. The study results will be applied to the fabrication of the 300-kW-class SIH.