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Title: On the Mechanical Behavior of a $$Nb_3Sn$$ Superconducting Coil During a Quench: Two-Dimensional Finite Element Analysis of a Quench Heater

Abstract

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.

Authors:
 [1];  [2];  [1];  [3];  [1];  [1];  [4];  [1];  [1];  [1];  [1];  [3];  [5]
  1. CERN
  2. Fermilab
  3. LBNL, Berkeley
  4. Barcelona Supercomputing Ctr.
  5. Geneva U.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
LARP
OSTI Identifier:
1573826
Report Number(s):
FERMILAB-PUB-19-454-TD
oai:inspirehep.net:1763507
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
Cryogenics
Additional Journal Information:
Journal Name: Cryogenics
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

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., and Senatore, C. On the Mechanical Behavior of a $Nb_3Sn$ Superconducting Coil During a Quench: Two-Dimensional Finite Element Analysis of a Quench Heater. United States: N. p., 2019. Web.
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 $Nb_3Sn$ Superconducting Coil During a Quench: Two-Dimensional Finite Element Analysis of a Quench Heater. United States.
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., and Senatore, C. Tue . "On the Mechanical Behavior of a $Nb_3Sn$ Superconducting Coil During a Quench: Two-Dimensional Finite Element Analysis of a Quench Heater". United States. https://www.osti.gov/servlets/purl/1573826.
@article{osti_1573826,
title = {On the Mechanical Behavior of a $Nb_3Sn$ Superconducting Coil During a Quench: Two-Dimensional Finite Element Analysis of a Quench Heater},
author = {Ferradas Troitino, J. and Ambrosio, G. and Bajas, H. and Brouwer, L. and Ferracin, P. and Izquierdo Bermudez, S. and Lorenzo Gomez, J. V. and Mangiarotti, F. J. and Perez, J. C. and Ravaioli, E. and Tapani Taakala, F. and Vallone, G. and Senatore, C.},
abstractNote = {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.},
doi = {},
journal = {Cryogenics},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {1}
}