ANALYTICAL ESTIMATION OF THE THERMAL STABILITY OF HTS MAGNETS DURING SUDDEN DISCHARGE
Abstract
Since the advent of 2nd-generation high-temperature superconducting (HTS) tapes, which show great features on critical temperature, critical current density, and critical magnetic field, many researchers have been trying to generate ultra-high magnetic fields using HTS coils. One more promising technology is a no-insulation (NI) winding technique. This technique suppresses the possibility of thermal runaway and burning-out of HTS coils drastically. The interest in compact nuclear fusion magnets wound with HTS conductors has been increasing rapidly during the last five years. The simulation of such magnets larger than MRI/NMR HTS magnets takes an unfeasibly long time. Therefore, we present a simple expression of the coil temperature rise under a simple assumption derived from the simple coil model, to investigate the stability of large-scale magnets. The method’s advantages are simplicity, versatility, and nearly no computation, enabling a time reduction in the first-cut design.
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References
M. Wu et al.: Superconductivity at 93 K in a new mixed-phase Yb-Ba-Cu-O compound system at ambient pressure, Phys. Rev. Lett, Vol. 5, Iss. 9, p.p. 908-910, 1987
S. Hahn et al.: HTS pancake coils without turn-to-turn insulation, IEEE Trans. Appl. Supercond, Vol. 21, Iss. 3, p.p. 1592-1595, 2011
S. Hahn et al.: 45.5-Tesla direct-current magnetic field generated with a high-temperature superconducting magnet, nature, Vol. 570, p.p. 496-499, 2019
J. LIu et al.: World record 32.35-tesla direct-current magnetic field generated with whole superconductor magnet, Supercond. Sci. Technol, Vol. 33, Iss. 3, Art. no. 03LT01, 2020
A. Ikeda et al.: Transient behaviors of no-insulation REBCO pancake coil during local normal-state transition, IEEE Trans. Appl. Supercond, Vol. 26, Iss. 4, 2016
D. Chandler et al.: MIT-designed project achieves major advance toward fusion energy, MIT news, available at https://news.mit.edu/2021/MIT-CFS-major-advance-toward-fusion-energy-0908, 2021
S. Noguchi et al.: A newly developed screening current simulation method for REBCO pancake coils based on extension of PEEC model, Supercond. Sci. Technol, Vol. 35, Iss. 4, Art. no. 04400, 2020
Y. Iwasa et al.: Case studies in superconducting magnets: design and operational issues, Springer: New York, 2009
Y. Suetomi et al.: Quench and self-protecting behavior of an intra-layer no-insulation (LNI) REBCO coil at 31.4 T, Supercond. Sci. Technol, Vol. 34, Iss. 6, Art. no. 064003, 2021
S. Noguchi et al.: A simple protection evaluation method for no-insulation REBCO pancake coils during local normal-state transition, Supercond. Sci. Technol, Vol. 32, Iss. 4, Art. no. 045001, 2019
