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The use of superconductivity in magnetic balance designThe magnetic field and field gradient requirements for magnetic suspension in a Mach 3, 6-in. diameter wind tunnel are stated, along with the power requirements for gradient coil pairs wound of copper operating at room temperature and aluminum cooled to 20 K. The power dissipated is large enough that the use of superconductivity in the coil design becomes an attractive alternative. The problems of stability and ac losses are outlined along with the properties of stabilized superconductors. A brief review of a simplified version of the critical state model of C. P. Bean is presented, and the problems involved in calculations of the ac losses in superconducting coils are outlined. A summary of ac loss data taken on pancake coils wound of commercially available Nb3Sn partially stabilized tape is presented and shown as leading to the U.Va. gradient coil design. The actual coil performance is compared with predictions based on the BNL results. Finally, some remarks are presented concerning scaling of the ac losses to larger magnetic suspension systems as well as prospects for improved performance using newer multifilament superconductors.
Document ID
19730015546
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Moss, F. E.
(Virginia Univ. Charlottesville, VA, United States)
Date Acquired
August 7, 2013
Publication Date
February 1, 1973
Publication Information
Publication: Develop. of a Superconducting Electromagnetic Suspension and Balance System for Dyn. Stability Studies
Subject Category
Physics, Solid-State
Accession Number
73N24273
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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