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AC Loss Measurements of Two Multifilamentary NbTi Composite Strands

Collings, E. W. / Marken, K. R. Jr. / Sumption, M. D. / Goldfarb, R. B. / Loughran, R. J.

Abstract 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 μm, 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 μm.

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AC Loss Measurements of Two Multifilamentary NbTi Composite Strands

Collings, E. W. / Marken, K. R. Jr. / Sumption, M. D. / Goldfarb, R. B. / Loughran, R. J.

Abstract 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 μm, 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 μm.

AC Loss Measurements of Two Multifilamentary NbTi Composite Strands

Collings, E. W. / Marken, K. R. Jr. / Sumption, M. D. / Goldfarb, R. B. / Loughran, R. J.

Abstract 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 μm, 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 μm.

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Title:

AC Loss Measurements of Two Multifilamentary NbTi Composite Strands

Contributors:

Collings, E. W. (author) / Marken, K. R. Jr. (author) / Sumption, M. D. (author) / Goldfarb, R. B. (author) / Loughran, R. J. (author)

Published in:

Advances in Cryogenic Engineering Materials ; 169-176

An International Cryogenic Materials Conference Publication ; 36

Publication date:

1990-01-01

Size:

8 pages

ISBN:

978-1-4613-9882-0 , 978-1-4613-9880-6

ISSN:

DOI:

https://doi.org/10.1007/978-1-4613-9880-6_22

Type of media:

Article/Chapter (Book)

Type of material:

Electronic Resource

Language:

English

Keywords:

Critical Current Density , Critical State Model , Filament Diameter , Ratio Twist , Apply Field Strength Chemistry , Biochemical Engineering , Characterization and Evaluation of Materials , Mechanical Engineering

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