The use of a winding model instead of effective continuum model can lead to a drastic reduction of MQE in superconducting coils
The use of a winding model instead of effective continuum model can lead to a drastic reduction of MQE in superconducting coils
Thermal stability is an essential parameter for coil design. Previous measurements in an MgB2 solenoid have revealed a change in trend in the minimum quench energy (MQE) dependence on j = I/I., showing lower values than expected for operative current close to the critical current (j ~ 0.90). The obtained MQE is comparable to the one predicted by analytical models in a single tape (1D) being of the order of 1-10 mJ, which indicates that propagation across winding and layers (3D) is not taking place. This reduction of MQE is not obtained in the effective continuum model, because the different turns and layers are not reproduced. Obtaining 1D propagation depends on the ratio between the thermal conductivity of the conductor and insulation and on the cooling conditions at the boundary layers. A numerical model of a superconducting solenoid with full representation of the winding is used to study MQE as a function ofj (0.6-0.99). The quench is triggered applying heat pulses of 40 ms in a region of 4 mm of the outer layer of the coil. The effect of changing the cooling boundary conditions of the coil from adiabatic to isothermal is also investigated.
MgB2, NUMERICAL MODELLING, quench, superconducting solenoid
Pelegrin Mosquera, Jorge
4e39f6e9-b12b-46a0-94a7-70727dcb53ec
Young, Edward
d3a881b0-a564-41f5-9843-34ae86da360f
Yang, Yifeng
4cac858a-e0c0-4174-a839-05ca394fc51f
4 June 2017
Pelegrin Mosquera, Jorge
4e39f6e9-b12b-46a0-94a7-70727dcb53ec
Young, Edward
d3a881b0-a564-41f5-9843-34ae86da360f
Yang, Yifeng
4cac858a-e0c0-4174-a839-05ca394fc51f
Pelegrin Mosquera, Jorge, Young, Edward and Yang, Yifeng
(2017)
The use of a winding model instead of effective continuum model can lead to a drastic reduction of MQE in superconducting coils.
IEEE Transactions on Applied Superconductivity, 27 (4).
(doi:10.1109/TASC.2017.2654118).
Abstract
Thermal stability is an essential parameter for coil design. Previous measurements in an MgB2 solenoid have revealed a change in trend in the minimum quench energy (MQE) dependence on j = I/I., showing lower values than expected for operative current close to the critical current (j ~ 0.90). The obtained MQE is comparable to the one predicted by analytical models in a single tape (1D) being of the order of 1-10 mJ, which indicates that propagation across winding and layers (3D) is not taking place. This reduction of MQE is not obtained in the effective continuum model, because the different turns and layers are not reproduced. Obtaining 1D propagation depends on the ratio between the thermal conductivity of the conductor and insulation and on the cooling conditions at the boundary layers. A numerical model of a superconducting solenoid with full representation of the winding is used to study MQE as a function ofj (0.6-0.99). The quench is triggered applying heat pulses of 40 ms in a region of 4 mm of the outer layer of the coil. The effect of changing the cooling boundary conditions of the coil from adiabatic to isothermal is also investigated.
Text
ASC2016_Pelegrin_final
- Accepted Manuscript
More information
Accepted/In Press date: 1 January 2017
e-pub ahead of print date: 16 January 2017
Published date: 4 June 2017
Keywords:
MgB2, NUMERICAL MODELLING, quench, superconducting solenoid
Identifiers
Local EPrints ID: 413098
URI: http://eprints.soton.ac.uk/id/eprint/413098
ISSN: 1051-8223
PURE UUID: 2d9dc646-9c37-4e43-9402-4c168c0ef4d9
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Date deposited: 15 Aug 2017 16:30
Last modified: 16 Mar 2024 02:44
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Author:
Jorge Pelegrin Mosquera
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