DocumentCode :
1204257
Title :
Stability of superconductors cooled by supercritical helium in rapidly changing magnetic fields
Author :
Schmidt, C.
Author_Institution :
Inst. fur Tech. Phys., Kernforschungszentrum Karlsruhe, Germany
Volume :
28
Issue :
1
fYear :
1992
fDate :
1/1/1992 12:00:00 AM
Firstpage :
846
Lastpage :
849
Abstract :
The stability behavior of superconductors with respect to disturbances extended over a large magnet volume, e.g., by fast magnetic field changes, is discussed. Cooling by supercritical helium is considered, which is the usual cooling medium in cable-in-conduit conductors. On a time scale of a few milliseconds the heat transfer is mainly determined by heat diffusion. The solution of the one-dimensional heat diffusion equation allows the calculation of the stability limit as a function of the conductor parameters and of the external field change. Calculations for exponential and sinusoidal field variations were performed and compared with available experimental data. An easy-to-use stability criterion is given for exponential heat load
Keywords :
magnetic fields; stability; superconducting cables; superconducting magnets; cable-in-conduit conductors; cooling medium; exponential heat load; external field change; heat diffusion; heat transfer; magnet volume; rapidly changing magnetic fields; stability behavior; supercritical helium; Conductors; Cooling; Equations; Heat transfer; Helium; Magnetic fields; Stability; Superconducting cables; Superconducting magnets; Superconductivity;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/20.120010
Filename :
120010
Link To Document :
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