Ac loss measurements of two multifilamentary NbTi composite strands

Conference · Sun Jan 01 04:00:00 EST 1989

DOI:https://doi.org/10.1007/978-1-4613-9880-6_22· OSTI ID:5249464

Collings, E W; Marken, Jr, K R; Sumption, M D ^[1]; Goldfarb, R B; Loughran, R J ^[2]

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1. Battelle Memorial Inst., Columbus, OH (USA)
2. National Inst. of Standards and Technology, Boulder, CO (USA)

As part of an interlaboratory comparative testing program conducted in support of the Versailles Agreement on Advanced Materials and Standards (VAMAS), transverse-field dc hysteresis loss measurements were made at liquid-helium temperatures at fields of up to 3 T (30 kG) on two samples of multifilamentary NbTi composite. The strands differed widely in filament number, were comparable in filament diameter, and one of them was provided with a Cu-Ni barrier between the filaments. The results have been analyzed, and magnetically deduced critical current density values obtained (for comparison with directly measured transport data) using various standard techniques. Based on these studies, a figure-of-merit for ac loss is recommended. The Cu-matrix strand, with its interfilamentary spacing of less than 1 {mu}m, exhibited pronounced proximity-effect-induced coupling losses; this was not observed in the mixed-matrix strand which possessed not only a Cu-Ni barrier but also an interfilamentary spacing of typically 4 {mu}m.

• Research Organization: Battelle Memorial Inst., Columbus, OH (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC02-86ER40296
• OSTI ID: 5249464
• Report Number(s): CONF-890701-23; ON: DE90005388
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
COMPOSITE MATERIALS
COPPER ALLOYS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FILAMENTS
HYSTERESIS
MATERIALS
NIOBIUM ALLOYS
PHYSICAL PROPERTIES
SUPERCONDUCTING COMPOSITES
TITANIUM ALLOYS