Selection of a cryostabilized Nb/sub 3/Sn conductor cooling system for the large coil program
The Large Coil Project (LCP) is a program to design, fabricate and test relatively large superconducting toroidal field coils for tokamak fusion reactor applications. Some basic requirements that affect the conductor design are cryostabilization, 8 tesla peak magnetic field, and a specified maximum refrigeration load. The engineering considerations that led to the selection of a forced flow supercritical helium-cooled cable conductor are described. Comparisons of forced flow supercritical helium cooled cable conductors with pool boiling cooled monolithic conductors were made with regard to a number of factors such as the thermal capacity of the coolant, the thermal design margins, propensity for conductor normalization, predictability of the thermal-flow performance, controllability of the cooling conditions, etc. It was concluded that, although there exists a number of design uncertainties and engineering problems, forced flow supercritical helium cooled conductors can provide a far more reliable coil design than the pool boiling monolithic concept. The design of a cryostabilized Nb/sub 3/Sn hollow cabled conductor involved detailed considerations of the need for fully transposed conductor strands, the nonuniform void and helium flow distributions, heat transfer from the twisted conductor strands, and helium flow rate and pump work requirements. The uncertainties in the design are discussed and the specifications of a reference Nb/sub 3/Sn conductor concept that meets the design requirements and constraints are presented.
- Research Organization:
- Westinghouse Electric Corp., Pittsburgh, Pa. (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5271574
- Report Number(s):
- CONF-771029-91; TRN: 78-003076
- Resource Relation:
- Conference: 7. symposium on fusion research project, Knoxville, TN, USA, 25 Oct 1977
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SUPERCONDUCTING COILS
COOLING SYSTEMS
DESIGN
TOKAMAK TYPE REACTORS
FABRICATION
HELIUM
NIOBIUM BASE ALLOYS
SUPERCONDUCTING CABLES
TESTING
TIN ALLOYS
TOROIDAL CONFIGURATION
ALLOYS
ANNULAR SPACE
CABLES
CONDUCTOR DEVICES
CONFIGURATION
CRYOGENIC FLUIDS
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
ELEMENTS
EQUIPMENT
FLUIDS
NIOBIUM ALLOYS
NONMETALS
RARE GASES
THERMONUCLEAR REACTORS
700202* - Fusion Power Plant Technology- Magnet Coils & Fields
420201 - Engineering- Cryogenic Equipment & Devices