Normal zone propagation in adiabatic superconducting magnets over the temperature range 4.2–80 K
✍ Scribed by Y. Iwasa; Y.M. Butt
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 281 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0011-2275
No coin nor oath required. For personal study only.
✦ Synopsis
A theoretical analysis of operating temperature dependent normal zone propagation (NZP) has been performed in an adiabatic superconducting magnet over the temperature range 4.2-80 K. Because of the inverse dependence of NZP velocity on winding heat capacity, which increases sharply with temperature, above ~20 K the normal zone hardly grows beyond its initial size and the hot spot temperature reaches well above 300 K. A computer simulation of NZP was applied to a small, two-coil solenoid system that was assumed to operate at any temperature between 4.2 and 30 K. The results corroborate the conclusion of the analysis: that the solenoid system is self-protecting for operating temperatures up to ~20 K. This "operational critical temperature' up to which an adiabatic magnet is selfprotecting depends also on matrix current density and magnet size.