N°Spécial De Revue/Special Issue Journal of Physics: Conference Series Année : 2020

AC losses and induced fields in HTS coil wound using two-ply coated conductors

Résumé

Abstract AC losses and screening-current-induced fields (SCFs) in a high temperature superconducting (HTS) inserts for high field magnet are evaluated theoretically. The HTS inserts are composed of stacked pancake coils, which are wound using two-ply conductors, where the superconducting-layer sides of two rare-earth-based coated conductors are attached to each other without electrical insulation. The theoretical formulas of AC loss and SCF in the two-ply conductor are derived for the simultaneous applications of a transport current and an external magnetic field parallel to its broad face. By taking into account the magnetic-field profile in the HTS insert and the magnetic-field dependency of critical current density in the coated conductor, the AC losses and SCFs are estimated using the theoretical formulas for monotonical increase in a central field up to 25.5 T in 60 minutes in combination with low temperature superconducting outsert coils. It is guessed that the AC loss estimated for the HTS insert wound using the two-ply conductor could be cooled by using prepared cryocoolers. The magnitude of SCF in the HTS insert wound using the two-ply conductor becomes smaller than that for the single-tape conductor estimated previously.

Dates et versions

hal-03882786 , version 1 (02-12-2022)

Identifiants

Citer

H Yokoyama, B Zhu, K Kajikawa, S Awaji, A Badel, et al.. AC losses and induced fields in HTS coil wound using two-ply coated conductors. Journal of Physics: Conference Series, 1559 (1), pp.012130, 2020, ⟨10.1088/1742-6596/1559/1/012130⟩. ⟨hal-03882786⟩
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