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Critical current and stability of MgB2 twisted-pair DC cable assembly cooled by helium gas

Critical current and stability of MgB2 twisted-pair DC cable assembly cooled by helium gas
Critical current and stability of MgB2 twisted-pair DC cable assembly cooled by helium gas
Long length superconducting cables/bus-bars cooled by cryogenic gases such as helium operating over a wider temperature range are a challenging but exciting technical development prospects, with applications ranging from super-grid transmission to future accelerator systems. With limited existing knowledge and previous experiences, the cryogenic stability and quench protection of such cables are crucial research areas because the heat transfer is reduced and temperature gradient increased compared to liquid cryogen cooled cables. V-I measurements on gas-cooled cables over a significant length are an essential step towards a fully cryogenic stabilized cable with adequate quench protection. Prototype twisted-pair cables using high-temperature superconductor and MgB2 tapes have been under development at CERN within the FP7 EuCARD project. Experimental studies have been carried out on a 5-m-long multiple MgB2 cable assembly at different temperatures between 20 and 30 K. The subcables of the assembly showed similar critical current, consistent with the Ic of single twisted-pair MgB2 cable tested previously. The assembly was shown to operate stably with flowing helium gas cooling in a moderate vicinity of the critical current. A low and reproducible specific contact resistance of ~200 n? cm2 was obtained.
1051-8223
1-4
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Bailey, W.O.S.
c356b2e3-a783-4b4c-8c7b-521696d3b37c
Beduz, C.
2cbc6ece-3e8b-454b-86d6-3960596bd234
Taylor, T.
13f0de8a-163b-4979-bd74-036f11f940bb
Ballarino, A.
fbb2b272-16ce-4fcc-a2da-5fefa0ef16da
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Bailey, W.O.S.
c356b2e3-a783-4b4c-8c7b-521696d3b37c
Beduz, C.
2cbc6ece-3e8b-454b-86d6-3960596bd234
Taylor, T.
13f0de8a-163b-4979-bd74-036f11f940bb
Ballarino, A.
fbb2b272-16ce-4fcc-a2da-5fefa0ef16da

Yang, Y., Young, E.A., Bailey, W.O.S., Beduz, C., Taylor, T. and Ballarino, A. (2013) Critical current and stability of MgB2 twisted-pair DC cable assembly cooled by helium gas. IEEE Transactions on Applied Superconductivity, 23 (3), 1-4. (doi:10.1109/TASC.2013.2240039).

Record type: Article

Abstract

Long length superconducting cables/bus-bars cooled by cryogenic gases such as helium operating over a wider temperature range are a challenging but exciting technical development prospects, with applications ranging from super-grid transmission to future accelerator systems. With limited existing knowledge and previous experiences, the cryogenic stability and quench protection of such cables are crucial research areas because the heat transfer is reduced and temperature gradient increased compared to liquid cryogen cooled cables. V-I measurements on gas-cooled cables over a significant length are an essential step towards a fully cryogenic stabilized cable with adequate quench protection. Prototype twisted-pair cables using high-temperature superconductor and MgB2 tapes have been under development at CERN within the FP7 EuCARD project. Experimental studies have been carried out on a 5-m-long multiple MgB2 cable assembly at different temperatures between 20 and 30 K. The subcables of the assembly showed similar critical current, consistent with the Ic of single twisted-pair MgB2 cable tested previously. The assembly was shown to operate stably with flowing helium gas cooling in a moderate vicinity of the critical current. A low and reproducible specific contact resistance of ~200 n? cm2 was obtained.

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More information

e-pub ahead of print date: 22 January 2013
Published date: June 2013
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 377388
URI: http://eprints.soton.ac.uk/id/eprint/377388
ISSN: 1051-8223
PURE UUID: 4ac22ae0-c5c7-4f34-8b02-8b9804b177cc
ORCID for Y. Yang: ORCID iD orcid.org/0000-0002-3874-6735

Catalogue record

Date deposited: 11 Jun 2015 14:01
Last modified: 20 Jul 2019 01:21

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