Open AccessAC losses and induced fields in HTS coil wound using two-ply coated conductors
Author(s) -
Hiroyuki Yokoyama,
Bo Zhu,
Kazuhiro Komori,
Satoshi Awaji,
Arnaud Badel,
Kohki Takahashi,
Tatsunori Okada
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1559/1/012130
Subject(s) - conductor , electrical conductor , electromagnetic coil , materials science , magnet , insert (composites) , superconductivity , magnetic field , superconducting magnet , cryocooler , resistive touchscreen , high temperature superconductivity , composite material , nuclear magnetic resonance , condensed matter physics , electrical engineering , mechanical engineering , physics , engineering , quantum mechanics
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.