The Role of Quench-back in the Passive Quench Protection of Long Solenoids with Coil Sub-division
This paper describes how a passive quench protection system can be applied to long superconducting solenoid magnets. When a solenoid coil is long compared to its thickness, the magnet quench process will be dominated by the time needed for uench propagation along the magnet length. Quench-back will permit a long magnet to quench more rapidly in a passive way. Quenchback from a conductive (low resistivity) mandrel is essential for spreading the quench along the length of a magnet. The andrel must be inductively coupled to the magnet circuit that is being quenched. Current induced in the mandrel by di/dt in the magnet produces heat in the mandrel, which in turn causes the superconducting coil wound on the mandrel to quench. Sub-divisions often employed to reduce the voltages to ground within the coil. This paper explores when it is possible for quench-back to be employed for passive quench protection. The role of sub-division of the coil is discussed for long magnets.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- Accelerator& Fusion Research Division; Engineering Division
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 981463
- Report Number(s):
- LBNL-2992E; TRN: US1003930
- Journal Information:
- IEEE Transactions on Applied Superconductivity, Vol. 20, Issue 3; Related Information: Journal Publication Date: June 2010
- Country of Publication:
- United States
- Language:
- English
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