For the cooling of high-temperature superconductivity applications (HTS applications), G-M, Stirling and pulse-tube cryocoolers are used. However; those coolers were developed for other applications; in other words, they are not suited for adaptation to HTS applications. Cryocoolers for HTS applications are described and the requirements of cryocoolers are explained. A new refrigerator required for HTS applications is presented and explained.
