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

H. Yokoyama, B. Zhu, K. Kajikawa, S. Awaji, A. Badel, K. Takahashi, T. Okada

Research output: Contribution to journalConference articlepeer-review

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.

Original languageEnglish
Article number012130
JournalJournal of Physics: Conference Series
Volume1559
Issue number1
DOIs
Publication statusPublished - Jun 19 2020
Event14th European Conference on Applied Superconductivity, EUCAS 2019 - Glasgow, United Kingdom
Duration: Sep 1 2019Sep 5 2019

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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