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On the Mechanical Behavior of a Nb$_3$Sn Superconducting Coil During a Quench: Two-Dimensional Finite Element Analysis of a Quench Heater

New high-field accelerator magnets based on $Nb_3Sn$ superconductors are pushing the boundaries of magnet design and quench protection towards new limits. While their large stored energies and current densities result in a very challenging scenario for magnet protection, their great electromagnetic...

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Autores principales: Ferradas Troitino, J, Ambrosio, G, Bajas, H, Brouwer, L, Ferracin, P, Izquierdo Bermudez, S, Lorenzo Gomez, J V, Mangiarotti, F J, Perez, J C, Ravaioli, E, Tapani Taakala, F, Vallone, G, Senatore, C
Lenguaje:eng
Publicado: 2019
Materias:
Acceso en línea:https://dx.doi.org/10.1016/j.cryogenics.2020.103054
http://cds.cern.ch/record/2712054
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author Ferradas Troitino, J
Ambrosio, G
Bajas, H
Brouwer, L
Ferracin, P
Izquierdo Bermudez, S
Lorenzo Gomez, J V
Mangiarotti, F J
Perez, J C
Ravaioli, E
Tapani Taakala, F
Vallone, G
Senatore, C
author_facet Ferradas Troitino, J
Ambrosio, G
Bajas, H
Brouwer, L
Ferracin, P
Izquierdo Bermudez, S
Lorenzo Gomez, J V
Mangiarotti, F J
Perez, J C
Ravaioli, E
Tapani Taakala, F
Vallone, G
Senatore, C
author_sort Ferradas Troitino, J
collection CERN
description New high-field accelerator magnets based on $Nb_3Sn$ superconductors are pushing the boundaries of magnet design and quench protection towards new limits. While their large stored energies and current densities result in a very challenging scenario for magnet protection, their great electromagnetic forces create also new requirements in terms of magnet design and stress management techniques. Furthermore, the strain sensitivity of $Nb_3Sn$ cables turns the electro-mechanical limits of the conductor into a parameter of the highest importance, where conductor degradation becomes a critical aspect in magnet operation. The coupling of all the above-mentioned considerations during quench is a case of special interest that adds further complexity to the design of $Nb_3Sn$ magnets. The objective of this paper is to provide a complete two-dimensional investigation of the coil and magnet structure mechanics during a quench event. The analysis is performed using a combination of finite element codes that provide the necessary input for the mechanical study. The core of the modelling strategy relies on a thermal-electric model, whose results are directly used as loads in the mechanical simulation. In doing so, the stress evolution during and after a quench is obtained. We focus for this time in the analysis of a quench heater protected magnet, where dynamic effects are of less importance in contrast to other protection systems like CLIQ.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2019
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spelling oai-inspirehep.net-17635072020-08-28T13:00:02Zdoi:10.1016/j.cryogenics.2020.103054http://cds.cern.ch/record/2712054engFerradas Troitino, JAmbrosio, GBajas, HBrouwer, LFerracin, PIzquierdo Bermudez, SLorenzo Gomez, J VMangiarotti, F JPerez, J CRavaioli, ETapani Taakala, FVallone, GSenatore, COn the Mechanical Behavior of a Nb$_3$Sn Superconducting Coil During a Quench: Two-Dimensional Finite Element Analysis of a Quench HeaterAccelerators and Storage RingsNew high-field accelerator magnets based on $Nb_3Sn$ superconductors are pushing the boundaries of magnet design and quench protection towards new limits. While their large stored energies and current densities result in a very challenging scenario for magnet protection, their great electromagnetic forces create also new requirements in terms of magnet design and stress management techniques. Furthermore, the strain sensitivity of $Nb_3Sn$ cables turns the electro-mechanical limits of the conductor into a parameter of the highest importance, where conductor degradation becomes a critical aspect in magnet operation. The coupling of all the above-mentioned considerations during quench is a case of special interest that adds further complexity to the design of $Nb_3Sn$ magnets. The objective of this paper is to provide a complete two-dimensional investigation of the coil and magnet structure mechanics during a quench event. The analysis is performed using a combination of finite element codes that provide the necessary input for the mechanical study. The core of the modelling strategy relies on a thermal-electric model, whose results are directly used as loads in the mechanical simulation. In doing so, the stress evolution during and after a quench is obtained. We focus for this time in the analysis of a quench heater protected magnet, where dynamic effects are of less importance in contrast to other protection systems like CLIQ.New high-field accelerator magnets based on Nb3Sn superconductors are pushing the boundaries of magnetdesign and quench protection towards new limits. While their large stored energies and current densities resultin a very challenging scenario for magnet protection, their great electromagnetic forces create also new re-quirements in terms of magnet design and stress management techniques. Furthermore, the strain sensitivity ofNb3Sn cables turns the electro-mechanical limits of the conductor into a parameter of the highest importance,where conductor degradation becomes a critical aspect in magnet operation. The coupling of all the above-mentioned considerations during a quench is a case of special interest that adds further complexity to the designof Nb3Sn magnets. The objective of this paper is to provide a complete two-dimensional investigation of the coiland magnet structure mechanics during a quench event. The analysis is performed using a combination offiniteelement codes that provide the necessary input for the mechanical study. The core of the modelling strategyrelies on a thermal-electric model, whose results are directly used as loads in the mechanical simulation. In doingso, the stress evolution during and after a quench is obtained. We focus for this time in the analysis of a quenchheater protected magnet, where electro-magnetic dynamic effects are of less importance in contrast to otherprotection systems like CLIQ.FERMILAB-PUB-19-454-TDoai:inspirehep.net:17635072019
spellingShingle Accelerators and Storage Rings
Ferradas Troitino, J
Ambrosio, G
Bajas, H
Brouwer, L
Ferracin, P
Izquierdo Bermudez, S
Lorenzo Gomez, J V
Mangiarotti, F J
Perez, J C
Ravaioli, E
Tapani Taakala, F
Vallone, G
Senatore, C
On the Mechanical Behavior of a Nb$_3$Sn Superconducting Coil During a Quench: Two-Dimensional Finite Element Analysis of a Quench Heater
title On the Mechanical Behavior of a Nb$_3$Sn Superconducting Coil During a Quench: Two-Dimensional Finite Element Analysis of a Quench Heater
title_full On the Mechanical Behavior of a Nb$_3$Sn Superconducting Coil During a Quench: Two-Dimensional Finite Element Analysis of a Quench Heater
title_fullStr On the Mechanical Behavior of a Nb$_3$Sn Superconducting Coil During a Quench: Two-Dimensional Finite Element Analysis of a Quench Heater
title_full_unstemmed On the Mechanical Behavior of a Nb$_3$Sn Superconducting Coil During a Quench: Two-Dimensional Finite Element Analysis of a Quench Heater
title_short On the Mechanical Behavior of a Nb$_3$Sn Superconducting Coil During a Quench: Two-Dimensional Finite Element Analysis of a Quench Heater
title_sort on the mechanical behavior of a nb$_3$sn superconducting coil during a quench: two-dimensional finite element analysis of a quench heater
topic Accelerators and Storage Rings
url https://dx.doi.org/10.1016/j.cryogenics.2020.103054
http://cds.cern.ch/record/2712054
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