NDLI: The effects of potting on training and quench propagation in a large stored energy superconducting dipole coil

Content Provider	IEEE Xplore Digital Library
Author	Cox, B. Garbincius, P. Guerra, J. Mazur, P. Satti, J. Tilles, E.
Copyright Year	1965
Abstract	A superconducting racetrack dipole coil was constructed to compare directly training and quench behavior in potted and non-potted coils. The stored energy of this coil was 175 KJoules at the conductor's short sample limit of 238 Amp with a peak field in the coil of 7.6 Tesla. The outward magnetic forces were restrained by rows of tie rods between side plates. Comparisons of training behavior were made for both steel and aluminum tie rods. Helium flow was provided by channels in the fiberglass cable tape allowing one-quarter of the conductor surface direct access to the helium supply. After training the coil to 90% of short sample limit, the tie rods were relaxed and the entire coil was vacuum impregnated with a standard clear magnet epoxy. After potting, the previous tie rod preloads were re-established. This resulted in a shallower training curve, and required retraining after thermal cycling. The unpotted coil showed no evidence of internal quench propagation below 80% of short sample, whereas the potted coil exhibited good quench propagation and energy dissipation at all currents, simplifying protection strategies.
Sponsorship	IEEE Magnetics Society
Starting Page	424
Ending Page	427
Page Count	4
File Size	290361
File Format	PDF
ISSN	00189464
Volume Number	17
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1981-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Superconducting coils Superconducting magnets Helium Magnetic forces Steel Aluminum Optical fiber cables Conductors Energy dissipation Protection
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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