Quenching of technical superconductors by heat and magnetic field pulses
Abstract
The transition of a superconductor into the normal conducting state can be caused by external or internal disturbances. The initiation of normal conduction by external disturbances was investigated for technical superconductors by means of thermal and magnetic pulses applied locally to the superconductor. The dependence on transport current and matrix material respectively of the minimum energy and the minimum magnetic field to initiate normal conduction were determined. The conclusion was that the heat conducting along the superconductor has the most effective influence in stabilizing against thermal disturbances. The transition to normal conduction by magnetic field pulses could be explained by eddy current heating in the matrix. A 50 micron single core conductor was insensitive to the highest applied magnetic field pulses up to 0.3 T amplitude and a field rise of 75 per Ts and consequently did behave according to the adiabatic stability criteria.
- Publication:
-
Cryogenics
- Pub Date:
- February 1978
- DOI:
- 10.1016/0011-2275(78)90119-4
- Bibcode:
- 1978Cryo...18..103G
- Keywords:
-
- Conductive Heat Transfer;
- Electromagnetic Pulses;
- Quenching (Cooling);
- Superconductors;
- Constants;
- Power Amplifiers;
- Solenoids;
- Thermal Conductivity;
- Time Lag;
- Engineering (General)