NDLI: AC Loss in Pancake Coil Made From 12 mm Wide REBCO Tape

Content Provider	IEEE Xplore Digital Library
Author	Gomory, F. Souc, J. Pardo, E. Seiler, E. Soloviov, M. Frolek, L. Skarba, M. Konopka, P. Pekarcikova, M. Janovec, J.
Copyright Year	2002
Abstract	The design of a superconducting coil from high-performance REBCO coated conductors is often complicated because of complex anisotropy of the critical current density J_c . It is important to understand how much detail of this feature must be taken into consideration in the prediction of maximum achievable current and the expected ac loss. We present the results of investigation performed with a small (ten turns, 60 mm inner diameter) coil made from SuperPower tape of 12 mm width. The knowledge of J_c(B,θ) determined on short sample allowed prediction of the maximum achievable current of the coil and the ac loss behavior. We have also investigated the effect of the tape nonuniformity. Our results confirm that the lateral nonuniformity when J_c at tape edges is lower than in its center leads to significant increase of ac loss. A longitudinal nonuniformity, in particular a reduction of critical current in some portion along the tape length, is hardly observable in the ac loss result. On the other hand, using a piece of tape with lower J_c in the innermost coil turn would significantly reduce the maximum current. We also present calculations showing the change in current-voltage curve and redistribution of ac dissipation in the case of nonuniform tape quality.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	5900406
Ending Page	5900406
Page Count	1
File Size	896553
File Format	PDF
ISSN	10518223
Volume Number	23
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coils Magnetic fields Degradation Critical current density Windings High temperature superconductors superconducting magnets AC losses high-temperature superconductors numerical computations
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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