Thermal Characteristics of 2G HTS Tape With Anodized Aluminum Stabilizer for Cryogen-Free 2G HTS Magnet

Studies on second-generation (2G) high temperature superconductor (HTS) magnets cooled by a cryogenic refrigerator are actively underway due to the recent rapid advancement in 2G HTS tape technology. To reduce the initial cooling time, lower the operating temperature, and promptly extract the hot spot of the conduction cooled 2G HTS magnet during quenching, the magnet´s equivalent thermal conductivity should be high. In general, conventional 2G HTS tapes use a copper stabilizer wrapped with a low thermal conductivity polyimide electrical insulation tape. Ultimately, the low thermal conductivity of these conventional HTS magnets lengthens the cooling time, causing the magnet to burn out during quenching. In this paper, by replacing the copper stabilizer with an aluminum stabilizer and anodizing it for electrical insulation instead of using polyimide tape, the 2G HTS tape´s equivalent thermal conductivity was largely improved. Based on the results of thermal analysis and tests, the thermal characteristics of a conventional 2G HTS tape are compared with those of the 2G HTS tape presented in this paper.