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Proceedings Paper

Energy extraction from superconducting magnets using optically activated YBa2Cu3O7-x switches
Author(s): Deepnarayan Gupta; William R. Donaldson; Alan M. Kadin
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Paper Abstract

Screening currents in a superconducting thin film will exclude a perpendicular magnetic field, produced either by a coil or a magnet. When the film is driven into the normal state by a fast optical pulse, the screening currents decay, allowing flux to enter. The process of flux entry can be observed by measuring the induced voltage across a coil closely coupled to the film. This is equivalent to the operation of an opening switch. This concept has been experimentally demonstrated in low and high magnetic fields, corresponding to the reversible and irreversible regimes, using 500-nm thick YBa2Cu3O7-x films and a 1.064-micrometers , 150-ps pulsed laser. This contactless, inductive switching scheme can be used in energy extraction from superconducting magnetic energy storage (SMES). The switch design and theoretical analysis of current redistribution in optically irradiated YBa2Cu3O7-x thin films are discussed in this paper.

Paper Details

Date Published: 4 January 1995
PDF: 7 pages
Proc. SPIE 2343, Optically Activated Switching IV, (4 January 1995);
Show Author Affiliations
Deepnarayan Gupta, HYPRES (United States)
William R. Donaldson, Univ. of Rochester (United States)
Alan M. Kadin, Univ. of Rochester (United States)

Published in SPIE Proceedings Vol. 2343:
Optically Activated Switching IV
William R. Donaldson, Editor(s)

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