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Progress in HTS Trapped Field Magnets: J(sub c), Area, and ApplicationsProgress in trapped field magnets is reported. Single YBCO grains with diameters of 2 cm are made in production quantities, while 3 cm, 4 1/2 cm and 6 cm diameters are being explored. For single grain tiles: J(sub c) - 10,000 A/sq cm for melt textured grains; J(sub c) - 40,000 A/sq cm for light ion irradiation; and J(sub c) - 85,000 A/J(sub c) for heavy ion irradiation. Using 2 cm diameter tiles bombarded by light ions, we have fabricated a mini-magnet which trapped 2.25 Tesla at 77K, and 5.3 Tesla at 65K. A previous generation of tiles, 1 cm x 1 cm, was used to trap 7.0 Tesla at 55K. Unirradiated 2.0 cm tiles were used to provide 8 magnets for an axial gap generator, in a collaborative experiment with Emerson Electric Co. This generator delivered 100 Watts to a resistive load, at 2265 rpm. In this experiment, activation of the TFMs was accomplished by a current pulse of 15 ms duration. Tiles have also been studied for application as a bumper-tether system for the soft docking of spacecraft. A method for optimizing tether forces, and mechanisms of energy dissipation are discussed. A bus bar was constructed by welding three crystals while melt-texturing, such that their a,b planes were parallel and interleaved. The bus bar, of area approx. 2 sq cm, carried a transport current of 1000 amps, the limit of the testing equipment available.
Document ID
19990004206
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Weinstein, Roy
(Houston Univ. TX United States)
Ren, Yanru
(Houston Univ. TX United States)
Liu, Jian-Xiong
(Houston Univ. TX United States)
Sawh, Ravi
(Houston Univ. TX United States)
Parks, Drew
(Houston Univ. TX United States)
Foster, Charles
(Indiana Univ. Bloomington, IN United States)
Obot, Victor
(Texas Southern Univ. Houston, TX United States)
Arndt, G. Dickey
(NASA Johnson Space Center Houston, TX United States)
Crapo, Alan
(Emerson Electric Co. Saint Louis, MO United States)
Date Acquired
August 19, 2013
Publication Date
April 1, 1995
Publication Information
Publication: Proceedings of the Fourth International Conference and Exhibition: World Congress On Superconductivity
Volume: 1
Subject Category
Solid-State Physics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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