Superconductor design and loss analysis for a 20 MJ induction heating coil

Conference · Tue Jan 01 04:00:00 EST 1980

DOI:https://doi.org/10.1109/TMAG.1981.1061131· OSTI ID:5091872

Walker, M S; Declercq, J G; Zeitlin, B A

The design of a 50 k Ampere conductor for use in a 20 MJ Induction Heating Coil is described. The conductor is a wide flat cable of 36 subcables, each of which contains six NbTi strands around a stainless steel core strand. The 2.04 mm (0.080'') diameter monolithic strands allow bubble clearing for cryostable operation at a pool boiling heat transfer from the unoccluded strand surface of 0.26 Watts/cm/sup 2/. A thin, tough polyester amide-imide (Westinghouse Omega) insulation provides a rugged coating that will resist flaking and chipping during the cabling and compaction operations and provide (1) a reliable adherent surface for enhanced heat transfer, and (2) a low voltage standoff preventing interstrand coupling losses. The strands are uniquely configured using CuNi elements to provide low ac losses with NbTi filaments in an all-copper matrix. AC losses are expected to be approximately 0.3% of 20 MJ for a -7.5 T to 7.5 T one-second 1/2-cosinusoidal bipolar operation in a 20 MJ coil. They will be approximately 0.1% of 100 MJ for 1.8 second -8 T and +8 T ramped operation in a 100 MJ coil. The design is firmly based on the results of tests performed on prototype strands and subcables.

• Research Organization: Los Alamos Scientific Lab., NM (USA); Intermagnetics General Corp., Guilderland, NY (USA); Westinghouse Electric Corp., Pittsburgh, PA (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5091872
• Report Number(s): LA-UR-80-2742; CONF-800980-6
• Country of Publication: United States
• Language: English

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AC LOSSES
ALLOYS
DESIGN
ELECTRIC HEATING
ENERGY LOSSES
HEATING
JOULE HEATING
LOSSES
NIOBIUM ALLOYS
PERFORMANCE TESTING
PLASMA HEATING
RESISTANCE HEATING
SUPERCONDUCTING COILS
TESTING
THERMONUCLEAR REACTORS
TITANIUM ALLOYS
TOKAMAK TYPE REACTORS