Report on the second VAMAS AC loss round robin-magnetization measurement of low-frequency hysteretic loss

Author

Collings, E.W. ; Sumption, M.D. ; Itoh, K. ; Wada, H. ; Tachikawa, K.

Author_Institution

Battelle Memorial Inst., Columbus, OH, USA

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

540

Lastpage

543

Abstract

We report on the results of the 2/sup nd/ VAMAS (Versailles Project on Advanced Materials and Standards) intercomparison program on low-frequency (hysteretic) AC loss measurements. Two sets of multifilamentary NbTi strands were subjected to round-robin testing. In an initial series of tests, samples in various forms were measured mostly by vibrating-sample- and SQUID magnetometry. Considerable scatter was noted especially in the small-filament-diameter AC-loss data. In a study of measurement accuracy, a supplementary round-robin compared the results of VSM measurement of a given pair of copper-matrix samples. In the light of all the results, factors contributing to AC loss error are discussed and recommendations are made concerning the specification of future round-robin AC-loss testing.<>

Keywords

Josephson effect; SQUID magnetometers; loss measurement; magnetic variables measurement; magnetisation; measurement errors; multifilamentary superconductors; niobium alloys; superconducting device testing; titanium alloys; AC loss error; SQUID magnetometry; VAMAS AC loss round robin; Versailles Project on Advanced Materials and Standards; copper-matrix samples; hysteretic AC loss measurements; low-frequency hysteretic loss measurement; magnetization measurement; multifilamentary NbTi strands; scatter; Hysteresis; Light scattering; Loss measurement; Magnetic materials; Measurement standards; Niobium compounds; SQUIDs; Testing; Titanium compounds; Vibration measurement;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402607

Filename

402607