Design consideration and conductor selection of a low AC loss HTS REBCO magnet carrying high currents at 20 K and 40 K

Song, H., Jiang, Z. and Song, W. (2023) Design consideration and conductor selection of a low AC loss HTS REBCO magnet carrying high currents at 20 K and 40 K. IEEE Transactions on Applied Superconductivity, 33(5), 4701806. (doi: 10.1109/TASC.2023.3253072)

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AC loss in high temperature superconductor coils have been frequently studied, however, mostly for AC power applications at 77 K, rather than specifically for high current but low frequency AC superconducting magnet at 20–40 K. Due to their easy operation and Helium shortage, more HTS magnet systems employ conduction-cooling with cryocoolers. The HTS magnets are known for high stability and likely tolerate high AC loss, but it is unclear what is the maximum AC frequency assuming that cryocooler has limited capability (a few hundred Watts) for the 20-40 K temperature range. This paper will specifically study AC loss in a simple HTS dipole but with three conductor/cable options using simulations, (1) 12 mm wide tape, (2) two parallel 6 mm wide tapes, and (3) 6/2 (six 2 mm strands) Roebel cables. It has been found that the magnet at 5 Hz generates 200–400 W AC loss at 20 K or 40 K, potentially be cooled by two single stage cryocoolers. The 6/2 Roebel cable based magnet may allow higher frequency (6–8 Hz) due to its transposition and narrower conductor width.

Item Type:Articles
Additional Information:This work was supported in part by 2019-2024 US DOE Ernest Courant Traineeship in Accelerator Sciences and Engineering, in part by the Educational Program of Next Generation of Accelerator Physicists and Engineer, US Department of Energy under Grant DESC0020375, and in part by the New Zealand Ministry of Business, Innovation and Employment (MBIE) by the Strategic Science Investment Fund Advanced Energy Technology Platforms under Contract RTVU2004.
Glasgow Author(s) Enlighten ID:Song, Dr Wenjuan
Authors: Song, H., Jiang, Z., and Song, W.
College/School:College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
Journal Name:IEEE Transactions on Applied Superconductivity
ISSN (Online):1558-2515
Published Online:06 March 2023
Copyright Holders:Copyright © 2023 IEEE
First Published:First published in IEEE Transactions on Applied Superconductivity 33(5):4701806
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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