Energy dissipation of composite multifilamentary superconductors for high-current ramp-field magnet applications
Energy dissipation, which is also called AC loss, of a composite multifilamentary superconducting wire is one of the most fundamental concerns in building a stable superconducting magnet. Characterization and reduction of AC losses are especially important in designing a superconducting magnet for generating transient magnetic fields. The goal of this thesis is to improve the understanding of AC-loss properties of superconducting wires developed for high-current ramp-field magnet applications. The major tasks include: (1) building an advanced AC-loss measurement system, (2) measuring AC losses of superconducting wires under simulated pulse magnet operations, (3) developing an analytical model for explaining the new AC-loss properties found in the experiment, and (4) developing a computational methodology for comparing AC losses of a superconducting wire with those of a cable for a superconducting pulse magnet. A new experimental system using an isothermal calorimetric method was designed and constructed to measure the absolute AC losses in a composite superconductor. This unique experimental setup is capable of measuring AC losses of a brittle Nb{sub 3}Sn wire carrying high AC current in-phase with a large-amplitude pulse magnetic field. Improvements of the accuracy and the efficiency of this method are discussed. Three different types of composite wire have been measured: a Nb{sub 3}Sn modified jelly-roll (MJR) internal-tin wire used in a prototype ohmic heating coil, a Nb{sub 3}Sn internal-tin wire developed for a fusion reactor ohmic heating coil, and a NbTi wire developed for the magnets in a particle accelerator. The cross sectional constructions of these wires represent typical commercial wires manufactured for pulse magnet applications.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge, MA (United States). Plasma Fusion Center
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-91ER54110
- OSTI ID:
- 10180276
- Report Number(s):
- DOE/ER/54110--3; PFC/RR--94-8; ON: DE94018416; BR: 35AT15010/35AT15030
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
430300
665412
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700430
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACCELERATORS
AUXILIARIES AND COMPONENTS
CRITICAL CURRENT
DEMONSTRATION PROGRAMS
ENERGY LOSSES
EXPERIMENTAL DATA
HYSTERESIS
JOULE HEATING
MAGNET COILS AND FIELDS
NIOBIUM ALLOYS
SUPERCONDUCTING CABLES
SUPERCONDUCTING COILS
SUPERCONDUCTING COMPOSITES
SUPERCONDUCTING DEVICES
SUPERCONDUCTING MAGNETS
SUPERCONDUCTING WIRES
THERMONUCLEAR REACTORS
TIN ALLOYS