The Role of Quench-back in the Passive Quench Protection of Long Solenoids with Coil Sub-division

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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 ... continued below

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Green, Michael A.; Guo, XingLong; Wang, Li; Pan, Heng & Wu, Hong October 19, 2009.

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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.

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  • Journal Name: IEEE Transactions on Applied Superconductivity; Journal Volume: 20; Journal Issue: 3; Related Information: Journal Publication Date: June 2010

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  • Report No.: LBNL-2992E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 981463
  • Archival Resource Key: ark:/67531/metadc1014366

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 19, 2009

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  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 18, 2017, 10:10 a.m.

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Green, Michael A.; Guo, XingLong; Wang, Li; Pan, Heng & Wu, Hong. The Role of Quench-back in the Passive Quench Protection of Long Solenoids with Coil Sub-division, article, October 19, 2009; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc1014366/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.