Title :
Stability of superconductors cooled by supercritical helium in rapidly changing magnetic fields
Author_Institution :
Inst. fur Tech. Phys., Kernforschungszentrum Karlsruhe, Germany
fDate :
1/1/1992 12:00:00 AM
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;
Journal_Title :
Magnetics, IEEE Transactions on