NDLI: Protection of HTS Coils in the Limit of Zero Quench Propagation Velocity

Content Provider	IEEE Xplore Digital Library
Author	Markiewicz, W.D.
Copyright Year	2002
Abstract	The observed low quench propagation velocity in HTS superconductors is a problem for the internal protection of magnet coils, which depends on the propagation velocity for the spread of the normal zone. In principle, a distribution of protection heaters can be used to give a large effective propagation velocity, but such a system raises the question of the amount of power and voltage required by the heaters to protect a coil. Here, an analysis is made for the ideal limiting case of zero propagation velocity. In this case, the heated zone adjacent to the heaters is a well defined normal volume. The analysis addresses two issues: determination of the normal volume required for the protection of the coil, and the power and voltage requirements of the heaters. The analysis is applied to two types of HTS coils, including low field coils operating at high temperature of the type that may be used for gyrotron applications, and high field insert coils operating at low temperature. For the example coils studied, the heater voltages are found to be moderate and the analysis indicates that protection by densely distributed heaters is a practical means of protection of HTS coils.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1333
Ending Page	1336
Page Count	4
File Size	228922
File Format	PDF
ISSN	10518223
Volume Number	18
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	High temperature superconductors Superconducting coils Power system protection Superconducting magnets Voltage Magnetic analysis Conductors Gyrotrons Object detection Superconductivity superconducting magnets high temperature superconductors quench protection
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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