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Measurement of AC losses in MgB2 wire and bulk conductors at different temperatures

Measurement of AC losses in MgB2 wire and bulk conductors at different temperatures
Measurement of AC losses in MgB2 wire and bulk conductors at different temperatures
AC loss measurements were carried out on MgB2 wire and bulk conductors at temperatures between 25 K and 40 K in applied field up to 0.2 T transverse to conductor length. For bulk conductors in the shape of a flat plate (3mm ×  0.5 mm), loss behavior of a thin strip Q H04 was observed. A reduction of width to 1 mm leads to a change in loss behavior similar to a round wire with Q  ∝ H03. For the ex-situ MgB2 wire of Ni sheath, losses were totally dominated by the hysteresis of ferromagnetic Ni. While the losses in the superconducting core is greatly reduced by the strong magnetic shielding by the Ni sheath, a small increase in the Ni loss was observed upon superconducting transition in the core. This is attributed to the compression of magnetic flux due to the diamagnetic superconducting core. Such an interpretation is supported by measurements of PbBi2223 tape in a cavity of an iron block.
ac losses, composites conductors, superconductivity
1051-8223
2883-2886
Yang, Y.
0c661323-7e23-41c6-a9a2-b4479fd74ef1
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Bianchetti, M.
3a893578-61e9-4c14-8af7-05557e87403c
Beduz, C.
2cbc6ece-3e8b-454b-86d6-3960596bd234
Martinez, E.
67ed8d9b-3213-4797-aeae-1c9e6985e48f
Giunchi, G.
3eb35a1e-6aba-4531-8bed-717a48f21ab8
Yang, Y.
0c661323-7e23-41c6-a9a2-b4479fd74ef1
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Bianchetti, M.
3a893578-61e9-4c14-8af7-05557e87403c
Beduz, C.
2cbc6ece-3e8b-454b-86d6-3960596bd234
Martinez, E.
67ed8d9b-3213-4797-aeae-1c9e6985e48f
Giunchi, G.
3eb35a1e-6aba-4531-8bed-717a48f21ab8

Yang, Y., Young, E.A., Bianchetti, M., Beduz, C., Martinez, E. and Giunchi, G. (2005) Measurement of AC losses in MgB2 wire and bulk conductors at different temperatures. IEEE Transactions on Applied Superconductivity, 15 (2, Part 3), 2883-2886. (doi:10.1109/TASC.2005.848254).

Record type: Article

Abstract

AC loss measurements were carried out on MgB2 wire and bulk conductors at temperatures between 25 K and 40 K in applied field up to 0.2 T transverse to conductor length. For bulk conductors in the shape of a flat plate (3mm ×  0.5 mm), loss behavior of a thin strip Q H04 was observed. A reduction of width to 1 mm leads to a change in loss behavior similar to a round wire with Q  ∝ H03. For the ex-situ MgB2 wire of Ni sheath, losses were totally dominated by the hysteresis of ferromagnetic Ni. While the losses in the superconducting core is greatly reduced by the strong magnetic shielding by the Ni sheath, a small increase in the Ni loss was observed upon superconducting transition in the core. This is attributed to the compression of magnetic flux due to the diamagnetic superconducting core. Such an interpretation is supported by measurements of PbBi2223 tape in a cavity of an iron block.

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Published date: 2005
Keywords: ac losses, composites conductors, superconductivity

Identifiers

Local EPrints ID: 23447
URI: http://eprints.soton.ac.uk/id/eprint/23447
ISSN: 1051-8223
PURE UUID: 7c8572b2-a483-40f8-851d-0be46946b610

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Date deposited: 17 Mar 2006
Last modified: 15 Mar 2024 06:47

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Contributors

Author: Y. Yang
Author: E.A. Young
Author: M. Bianchetti
Author: C. Beduz
Author: E. Martinez
Author: G. Giunchi

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