Development work on superconducting coils for a large mirror fusion test facility (MFTF). [Nb--Ti]
The geometry and size of the superconducting coils for the Mirror Fusion Test Facility (MFTF) proposed by Lawrence Livermore Laboratory (LLL) impose certain constraints on the Nb-Ti superconductor. The most promising fabrication process is a wrap-around technique in which a superconducting core is ''wrapped'' in stabilizing copper that contains built-in cooling channels. Insulation between pancake coils and turns is provided by perforated sheets and buttons of epoxy-impregnated fiberglass. Preliminary heat-transfer tests conducted on short samples of single conductor and on a nine-conductor bundle are reported and related to the heat generated in ''normal'' conductors. Investigation of joining techniques, necessary because of the length of conductor needed for the MFTF magnet (about 21 km per coil), show that cold-welded butt joints best meet all requirements. In a test coil now being built, approximately 2 km of prototype MFTF conductor will provide a self-field of about 4 T. Supplementary coils will boost the field to about 6.7 T. The test coils will be used to study cryostatic stability, the propagation and recovery of normal zones, and diagnostic techniques.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 7211571
- Report Number(s):
- UCRL-78891; CONF-770842-1; TRN: 77-018651
- Resource Relation:
- Conference: 6. international conference on magnet technology, Bratislava, Czechoslovakia, 29 Aug 1977
- Country of Publication:
- United States
- Language:
- English
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
MFTF DEVICES
SUPERCONDUCTING MAGNETS
FABRICATION
HEAT TRANSFER
NIOBIUM ALLOYS
PERFORMANCE TESTING
TITANIUM ALLOYS
ALLOYS
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ENERGY TRANSFER
EQUIPMENT
MAGNETIC MIRRORS
MAGNETS
OPEN PLASMA DEVICES
SUPERCONDUCTING DEVICES
TESTING
THERMONUCLEAR DEVICES
700202* - Fusion Power Plant Technology- Magnet Coils & Fields
420201 - Engineering- Cryogenic Equipment & Devices