Quench characteristics of bi2212 solenoid insert coils in background field up to 20 T
Quench characteristics of bi2212 solenoid insert coils in background field up to 20 T
The use of wind and react bi2212 wire for high field ( >;20 T) insert coils has been demonstrated to be a promising technology. While cryogenic stability and quench propagation are fundamental issues for the design and safe operation of superconducting magnets there is little data for the high field application. The present work shows data from systematic quench measurements at 4.2 K on two 6-layer 300 mm high bi2212 solenoid coils at different currents I between 50% and 95% of Ic in different background fields of 15, 18 and 20 T from a wide bore compact NbTi-Nb3Sn magnet developed by Oxford Instruments. The quench was induced by localized heat pulses (20–100 ms) and recorded with temporal-spatial resolved voltage taps and thermometers. By precise control of the power delivered in the heat pulse, the minimum quench energy MQE and the time constant for the quasi-stationary minimum propagation zone MPZ was obtained for each test condition. MQE was found to follow a scaling law of Ic2/I4 in three different coils. The MPZ exhibited the expected anisotropy, extending predominately in the tangential direction and confined in a single winding layer. The propagation was also predominantly along the winding layer with a relatively slow velocity less than 50 cm/s, with an even lower radial propagation velocity of $sim$3 mm/s. In the present study, the interplay between the HTS coils and with the LTS background field were also measured and the results are highly relevant to the design of 20 T plus high field magnets with integrated LTS and HTS coils. The results were analysed in the context of a wide current temperature range for current sharing in the bi2212 wire and the T3 dependence of heat capacity at low temperatures.
2432-2435
Yang, Y.
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Young, E.A.
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Falorio, I.
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Bailey, W.O.S.
c356b2e3-a783-4b4c-8c7b-521696d3b37c
Friend, C.M.
1e5264fc-3d8d-46b5-b61b-c2c0f89e8e78
Twin, A.
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Chappell, S.P.G.
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23 December 2010
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Falorio, I.
65afc7a9-336b-4cce-a034-0c37df06e2c4
Bailey, W.O.S.
c356b2e3-a783-4b4c-8c7b-521696d3b37c
Friend, C.M.
1e5264fc-3d8d-46b5-b61b-c2c0f89e8e78
Twin, A.
7b13ada6-a5af-4360-8176-229deb2b0034
Chappell, S.P.G.
fa3806c7-1df1-4869-9d46-4e41a66d92d8
Yang, Y., Young, E.A., Falorio, I., Bailey, W.O.S., Friend, C.M., Twin, A. and Chappell, S.P.G.
(2010)
Quench characteristics of bi2212 solenoid insert coils in background field up to 20 T.
IEEE Transactions on Applied Superconductivity, 21 (3), .
(doi:10.1109/TASC.2010.2092742).
Abstract
The use of wind and react bi2212 wire for high field ( >;20 T) insert coils has been demonstrated to be a promising technology. While cryogenic stability and quench propagation are fundamental issues for the design and safe operation of superconducting magnets there is little data for the high field application. The present work shows data from systematic quench measurements at 4.2 K on two 6-layer 300 mm high bi2212 solenoid coils at different currents I between 50% and 95% of Ic in different background fields of 15, 18 and 20 T from a wide bore compact NbTi-Nb3Sn magnet developed by Oxford Instruments. The quench was induced by localized heat pulses (20–100 ms) and recorded with temporal-spatial resolved voltage taps and thermometers. By precise control of the power delivered in the heat pulse, the minimum quench energy MQE and the time constant for the quasi-stationary minimum propagation zone MPZ was obtained for each test condition. MQE was found to follow a scaling law of Ic2/I4 in three different coils. The MPZ exhibited the expected anisotropy, extending predominately in the tangential direction and confined in a single winding layer. The propagation was also predominantly along the winding layer with a relatively slow velocity less than 50 cm/s, with an even lower radial propagation velocity of $sim$3 mm/s. In the present study, the interplay between the HTS coils and with the LTS background field were also measured and the results are highly relevant to the design of 20 T plus high field magnets with integrated LTS and HTS coils. The results were analysed in the context of a wide current temperature range for current sharing in the bi2212 wire and the T3 dependence of heat capacity at low temperatures.
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Published date: 23 December 2010
Organisations:
Thermofluids and Superconductivity
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Local EPrints ID: 187603
URI: http://eprints.soton.ac.uk/id/eprint/187603
ISSN: 1051-8223
PURE UUID: 078f9705-81fe-451c-b847-9728b2cf9fe6
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Date deposited: 17 May 2011 15:40
Last modified: 15 Mar 2024 02:45
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Author:
I. Falorio
Author:
C.M. Friend
Author:
A. Twin
Author:
S.P.G. Chappell
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