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Modeling of Stacked Single-Layer Coils Wound with Bi2223 Tapes Using a Lumped Constant Circuit

Tetsuhiro OBANA and Nozomu NANATO¹⁾

National Institute for Fusion Science, Toki 509-5292, Japan

1)

Okayama University of Science, Okayama 700-0005, Japan

(Received 12 November 2020 / Accepted 20 February 2021 / Published 9 April 2021)

Abstract

Stacked single-layer (SSL) coils wound with Bi2223 HTS tapes were modeled with a lumped circuit. Using the model, we investigated the effect of the joint resistance at coil terminals on the generated voltage for the SSL coils. The investigation shows that the joint resistance must be reduced as much as possible to restrain the voltage occurred in the SSL coils and each joint resistance should be uniform to make the current distribution uniform in the SSL coils. Additionally, we investigated the effect of inductance on the current distribution in the SSL coils and the effect of the tape's degradation on the coil performance. As a result, the current distribution of the SSL coils can be uniform due to the joint resistance even though the SSL coils have different inductances in each coil winding. Further, the current distribution and the voltage of the SSL coils are influenced by the tape's degradation.

Copyright (c) 2021 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

HTS coil, Bi2223 tape, stacked single-layer (SSL) coil, current distribution, modeling

DOI: 10.1585/pfr.16.2405051

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References

• [1] N. Nanato et al., J. Phys. Conf. Series 1054, 012070 (2018).
• [2] N. Nanato et al., J. Phys. Conf. Series 1293, 012072 (2019).