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Modeling of Interfilament Coupling Currents and Their Effect on Magnet Quench Protection

Variations in the transport current of a superconducting magnet cause several types of transitory losses. Due to its relatively short time constant, usually of the order of a few tens of milliseconds, interfilament coupling loss can have a significant effect on the coil protection against overheatin...

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Autores principales: Ravaioli, E, Auchmann, B, Chlachidze, G, Maciejewski, M, Sabbi, G, Stoynev, S E, Verweij, A
Lenguaje:eng
Publicado: 2017
Materias:
Acceso en línea:https://dx.doi.org/10.1109/TASC.2016.2636452
http://cds.cern.ch/record/2270297
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author Ravaioli, E
Auchmann, B
Chlachidze, G
Maciejewski, M
Sabbi, G
Stoynev, S E
Verweij, A
author_facet Ravaioli, E
Auchmann, B
Chlachidze, G
Maciejewski, M
Sabbi, G
Stoynev, S E
Verweij, A
author_sort Ravaioli, E
collection CERN
description Variations in the transport current of a superconducting magnet cause several types of transitory losses. Due to its relatively short time constant, usually of the order of a few tens of milliseconds, interfilament coupling loss can have a significant effect on the coil protection against overheating after a quench. This loss is deposited in the strands and can facilitate a more homogeneous transition to the normal state of the coil turns. Furthermore, the presence of local interfilament coupling currents reduces the magnet's differential inductance, which in turn provokes a faster discharge of the transport current. The lumped-element dynamic electrothermal model of a superconducting magnet has been developed to reproduce these effects. Simulations are compared to experimental electrical transients and found in good agreement. After its validation, the model can be used for predicting the performance of quench protection systems based on energy extraction, quench heaters, the newly developed coupling-loss-induced quench protection system, or combinations of those. The impact of interfilament coupling loss on each protection system is discussed.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2017
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spelling oai-inspirehep.net-15132552019-09-30T06:29:59Zdoi:10.1109/TASC.2016.2636452http://cds.cern.ch/record/2270297engRavaioli, EAuchmann, BChlachidze, GMaciejewski, MSabbi, GStoynev, S EVerweij, AModeling of Interfilament Coupling Currents and Their Effect on Magnet Quench ProtectionAccelerators and Storage RingsVariations in the transport current of a superconducting magnet cause several types of transitory losses. Due to its relatively short time constant, usually of the order of a few tens of milliseconds, interfilament coupling loss can have a significant effect on the coil protection against overheating after a quench. This loss is deposited in the strands and can facilitate a more homogeneous transition to the normal state of the coil turns. Furthermore, the presence of local interfilament coupling currents reduces the magnet's differential inductance, which in turn provokes a faster discharge of the transport current. The lumped-element dynamic electrothermal model of a superconducting magnet has been developed to reproduce these effects. Simulations are compared to experimental electrical transients and found in good agreement. After its validation, the model can be used for predicting the performance of quench protection systems based on energy extraction, quench heaters, the newly developed coupling-loss-induced quench protection system, or combinations of those. The impact of interfilament coupling loss on each protection system is discussed.oai:inspirehep.net:15132552017
spellingShingle Accelerators and Storage Rings
Ravaioli, E
Auchmann, B
Chlachidze, G
Maciejewski, M
Sabbi, G
Stoynev, S E
Verweij, A
Modeling of Interfilament Coupling Currents and Their Effect on Magnet Quench Protection
title Modeling of Interfilament Coupling Currents and Their Effect on Magnet Quench Protection
title_full Modeling of Interfilament Coupling Currents and Their Effect on Magnet Quench Protection
title_fullStr Modeling of Interfilament Coupling Currents and Their Effect on Magnet Quench Protection
title_full_unstemmed Modeling of Interfilament Coupling Currents and Their Effect on Magnet Quench Protection
title_short Modeling of Interfilament Coupling Currents and Their Effect on Magnet Quench Protection
title_sort modeling of interfilament coupling currents and their effect on magnet quench protection
topic Accelerators and Storage Rings
url https://dx.doi.org/10.1109/TASC.2016.2636452
http://cds.cern.ch/record/2270297
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