50-Hz ac losses in inductive coils with mixed matrix fine filament NbTi composites at fields up to 1 T
Measurements of 50-Hz ac losses were performed using three characteristic NbTi coil samples with ultrafine filaments and a Cu--CuNi mixed matrix at fields up to 1 T and at 4.2 K. Critical current and quenching current densities were measured under dc and ac conditions as well as the losses with their hysteresis and eddy current loss proportions. To characterize the samples by their eddy current loss proportions the transverse resistivity of the matrix rho/sub trans/ was determined. The results for losses show that under 50-Hz ac loads alternating fields up to approximately 1 T are attained without quenching. The fact that the associated eddy current losses of about 10/sup 5/ W/m/sup 3/ remain comparatively low at 0.5 T and 4.2 K opens up for such structured mixed matrix NbTi composites a novel field of application for superconducting generators and pulsed magnets with 50--60 Hz fed windings.
- Research Organization:
- Kernforschungszentrum Karlsruhe, Institut fuer Technische Physik, Postfach 3640, D-7500 Karlsruhe 1, Federal Republic of Germany
- OSTI ID:
- 5654403
- Journal Information:
- J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 54:9; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104 -- Metals & Alloys-- Physical Properties
420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AC LOSSES
ALLOYS
COMPOSITE MATERIALS
COPPER
COPPER ALLOYS
CRITICAL CURRENT
CURRENTS
EDDY CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELEMENTS
ENERGY LOSSES
FILAMENTS
HYSTERESIS
LOSSES
MATERIALS
MATRIX MATERIALS
METALS
NICKEL ALLOYS
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
QUENCHING
SUPERCONDUCTING COILS
SUPERCONDUCTING COMPOSITES
SUPERCONDUCTIVITY
TITANIUM ALLOYS
TRANSITION ELEMENTS
ULTRALOW TEMPERATURE
WIRES