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Quench onset and propagation in Cu-stabilized multifilament MgB2 conductors

Quench onset and propagation in Cu-stabilized multifilament MgB2 conductors
Quench onset and propagation in Cu-stabilized multifilament MgB2 conductors
The quench development of Cu-stabilized metal-sheathed MgB2 conductors has been analysed.
Experimentally, energy pulses were deposited into the conductor by passing rectangular current pulses through a graphite-based epoxy heater. The temperature and the electric field profiles around the point heat disturbance that gives rise to a quench, as well as their time evolution, were measured from multiple voltage taps and thermocouples along the conductor. The measurements have been done at self-field under two different conditions: in vacuum and in Ne vapour. The experimental results are in qualitative agreement with the simulated ones, obtained by solving the one-dimensional heat balance equation of the system and using a finite n value characterizing the I–V curves (VI^n). The temperature and current dependences of the minimum quench energy and the quench propagation velocity are presented. Our results show that the nonlinear power-law current sharing in the normal zone had significant influence on the onset of the quench process and resulted in a marked deviation from the classical quench theory based on the critical state model.
0953-2048
025009-025016
Martinez, E.
67ed8d9b-3213-4797-aeae-1c9e6985e48f
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Bianchetti, M.
3a893578-61e9-4c14-8af7-05557e87403c
Munoz, O.
29f985dc-0744-4202-aad1-4365e84adfc6
Schlachter, S.I.
2123aaae-32b3-4b08-a1d6-a07a95e6808c
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Martinez, E.
67ed8d9b-3213-4797-aeae-1c9e6985e48f
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Bianchetti, M.
3a893578-61e9-4c14-8af7-05557e87403c
Munoz, O.
29f985dc-0744-4202-aad1-4365e84adfc6
Schlachter, S.I.
2123aaae-32b3-4b08-a1d6-a07a95e6808c
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f

Martinez, E., Young, E.A., Bianchetti, M., Munoz, O., Schlachter, S.I. and Yang, Y. (2008) Quench onset and propagation in Cu-stabilized multifilament MgB2 conductors. Superconductor Science and Technology, 21 (2), 025009-025016. (doi:10.1088/0953-2048/21/02/025009).

Record type: Article

Abstract

The quench development of Cu-stabilized metal-sheathed MgB2 conductors has been analysed.
Experimentally, energy pulses were deposited into the conductor by passing rectangular current pulses through a graphite-based epoxy heater. The temperature and the electric field profiles around the point heat disturbance that gives rise to a quench, as well as their time evolution, were measured from multiple voltage taps and thermocouples along the conductor. The measurements have been done at self-field under two different conditions: in vacuum and in Ne vapour. The experimental results are in qualitative agreement with the simulated ones, obtained by solving the one-dimensional heat balance equation of the system and using a finite n value characterizing the I–V curves (VI^n). The temperature and current dependences of the minimum quench energy and the quench propagation velocity are presented. Our results show that the nonlinear power-law current sharing in the normal zone had significant influence on the onset of the quench process and resulted in a marked deviation from the classical quench theory based on the critical state model.

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Published date: 11 January 2008
Organisations: Thermofluids and Superconductivity

Identifiers

Local EPrints ID: 154795
URI: http://eprints.soton.ac.uk/id/eprint/154795
ISSN: 0953-2048
PURE UUID: d7e6b8f3-8c05-4f55-9caf-4a5f4b2ae1ef
ORCID for Y. Yang: ORCID iD orcid.org/0000-0002-3874-6735

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Date deposited: 26 May 2010 09:23
Last modified: 14 Mar 2024 02:37

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Contributors

Author: E. Martinez
Author: E.A. Young
Author: M. Bianchetti
Author: O. Munoz
Author: S.I. Schlachter
Author: Y. Yang ORCID iD

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