학술논문
Effect Comparison of Different Conductor Widths in Magnetic Dam for Protection of NI REBCO Pancake Coils
Document Type
Periodical
Author
Source
IEEE Transactions on Applied Superconductivity IEEE Trans. Appl. Supercond. Applied Superconductivity, IEEE Transactions on. 34(3):1-5 May, 2024
Subject
Language
ISSN
1051-8223
1558-2515
2378-7074
1558-2515
2378-7074
Abstract
One of the most challenging problems of no-insulation (NI) REBCO pancake coils is mechanical and thermal protection. Particularly, pancake coils suffer high stress during a local-normal state transition (quench event). One solution is a magnetic dam, which is merely NI windings with a few turns. The effectiveness of magnetic dams by 4-mm-wide NI windings was demonstrated numerically in the previous study. The effectiveness would be different when the REBCO tapes with different widths are employed. Therefore, in this article, the electromagnetic behaviors of NI REBCO pancake coils with the magnetic dam of 12-mm-wide REBCO tape are investigated numerically. The charging and the normal-state transition are simulated. It is demonstrated that the 4-mm-wide magnetic dam works more effectively due to the less screening current in the 4-mm-wide magnetic dam than the 12-mm-wide magnetic dam in this case.