Energy extraction from superconducting magnets using optically activated YBa2Cu3O7-x switches

Deepnarayan Gupta; William R. Donaldson; Alan M. Kadin

doi:10.1117/12.198652

4 January 1995 Energy extraction from superconducting magnets using optically activated YBa₂Cu₃O_7-x switches

Deepnarayan Gupta, William R. Donaldson, Alan M. Kadin

Proceedings Volume 2343, Optically Activated Switching IV; (1995) https://doi.org/10.1117/12.198652
Event: Photonics for Industrial Applications, 1994, Boston, MA, United States

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 YBa₂Cu₃O_7-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 YBa₂Cu₃O_7-x thin films are discussed in this paper.

Citation Download Citation

Deepnarayan Gupta, William R. Donaldson, and Alan M. Kadin "Energy extraction from superconducting magnets using optically activated YBa₂Cu₃O_7-x switches", Proc. SPIE 2343, Optically Activated Switching IV, (4 January 1995); https://doi.org/10.1117/12.198652

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