Transport AC Loss Characteristics of a Five Strand YBCO Roebel Cable With Magnetic Substrate

Author

Jiang, Zhenan ; Thakur, K.P. ; Staines, Mike ; Badcock, R.A. ; Long, N.J. ; Buckley, R.G. ; Amemiya, Naoyuki ; Caplin, A.D.

Author_Institution

Ind. Res. Ltd., Lower Hutt, New Zealand

Volume

21

Issue

3

fYear

2011

fDate

6/1/2011 12:00:00 AM

Firstpage

3289

Lastpage

3292

Abstract

Transport AC loss in a short length of 5/2 YBCO Roebel cable (five 2 mm wide strands) with weakly magnetic substrate is measured. The AC loss data are compared with those for a single strand. All the strands composing the cable and the single strand are cut from the same stock material. Transport AC loss in the 5/2 Roebel cable is larger than that predicted by both the Norris strip and ellipse models over a large range of the cable current. The difference between normalized AC losses in the Roebel cable and the single strand is larger at low I_t/I_c than at high I_t/I_c, where I_t is the amplitude of transport current. These AC loss characteristics were not observed in transport AC loss results for YBCO Roebel cables composed of coated conductor with non-magnetic substrate. Results from an electromagnetic analysis of two parallel stacks of wire with magnetic substrate are presented to elucidate the results.

Keywords

barium compounds; critical currents; high-temperature superconductors; superconducting cables; yttrium compounds; YBCO; cable current; coated conductor; electromagnetic analysis; magnetic substrate; strand YBCO Roebel cable; transport AC loss characteristics; transport current; Conductors; Loss measurement; Magnetic hysteresis; Substrates; Superconducting cables; Superconducting magnets; Yttrium barium copper oxide; AC loss; Roebel cable; YBCO; magnetic substrate;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2010.2088363

Filename

5617307