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A dual operational refrigerator/flow cryostat with wide bore medium field magnet for application demonstration

A dual operational refrigerator/flow cryostat with wide bore medium field magnet for application demonstration
A dual operational refrigerator/flow cryostat with wide bore medium field magnet for application demonstration
Since stand alone cryocooler systems have become more widely available, there has been increased commercial interest in superconductor applications in the temperature range intermediate to liquid helium and liquid nitrogen. There are however few facilities that have large in-field bore size with variable temperatures. A large bore system can reduce costs associated with full scale demonstration magnets by testing smaller coils and qualify medium length (up to meters) conductors. A 5 T, wide bore, (170 mm) Nb3Sn Oxford Instrument magnet has been integrated into a custom built dual mode refrigerator/helium flow cryostat with 600A HTS current leads. In one mode the system can be used with zero field without cost of liquid helium relying for cooling on a Sumitomo GM cryocooler with 1.5W at 4.2K: (no He) this can be used either as the sole characterisation method, or as a preliminary check before more expensive and extensive measurements are taken. The first measurements using MgB2 wire from 10 to 20K were made using a transient current step of ?5s duration, as opposed to a DC measurement. This has the advantage of not requiring thermal equilibrium to be achieved at nominal current. The feasibility of this technique for determining critical transport properties is discussed.
1343-1347
Young, E.A.
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Yang, Y.
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Bailey, W.O.S.
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Al-Mosawi, M.K.
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Beduz, C.
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Chappell, S.
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Twinn, A.
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Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Bailey, W.O.S.
c356b2e3-a783-4b4c-8c7b-521696d3b37c
Al-Mosawi, M.K.
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Beduz, C.
2cbc6ece-3e8b-454b-86d6-3960596bd234
Chappell, S.
f85847f0-3212-4639-88e7-4d55df1ca64d
Twinn, A.
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Young, E.A., Yang, Y., Bailey, W.O.S., Al-Mosawi, M.K., Beduz, C., Chappell, S. and Twinn, A. (2012) A dual operational refrigerator/flow cryostat with wide bore medium field magnet for application demonstration. Physics Procedia, 36, 1343-1347. (doi:10.1016/j.phpro.2012.06.302).

Record type: Article

Abstract

Since stand alone cryocooler systems have become more widely available, there has been increased commercial interest in superconductor applications in the temperature range intermediate to liquid helium and liquid nitrogen. There are however few facilities that have large in-field bore size with variable temperatures. A large bore system can reduce costs associated with full scale demonstration magnets by testing smaller coils and qualify medium length (up to meters) conductors. A 5 T, wide bore, (170 mm) Nb3Sn Oxford Instrument magnet has been integrated into a custom built dual mode refrigerator/helium flow cryostat with 600A HTS current leads. In one mode the system can be used with zero field without cost of liquid helium relying for cooling on a Sumitomo GM cryocooler with 1.5W at 4.2K: (no He) this can be used either as the sole characterisation method, or as a preliminary check before more expensive and extensive measurements are taken. The first measurements using MgB2 wire from 10 to 20K were made using a transient current step of ?5s duration, as opposed to a DC measurement. This has the advantage of not requiring thermal equilibrium to be achieved at nominal current. The feasibility of this technique for determining critical transport properties is discussed.

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Published date: 8 September 2012
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 359536
URI: http://eprints.soton.ac.uk/id/eprint/359536
PURE UUID: 4102f0ec-d1fc-4a98-a872-bf35763330c2
ORCID for Y. Yang: ORCID iD orcid.org/0000-0002-3874-6735

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Date deposited: 06 Nov 2013 14:12
Last modified: 10 Dec 2019 01:56

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Contributors

Author: E.A. Young
Author: Y. Yang ORCID iD
Author: W.O.S. Bailey
Author: M.K. Al-Mosawi
Author: C. Beduz
Author: S. Chappell
Author: A. Twinn

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