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Modelling V-I Measurements of Nb$_3$Sn Accelerator Magnets With Conductor Degradation

In the framework of the High-Luminosity Large Hadron Collider (HL-LHC) project, 11 T dipole and MQXF quadrupole magnets employing Nb$_3$Sn technology have been tested in short and long test configurations. Nb$_3$Sn magnets are more sensitive than Nb-Ti magnets to a potential degradation of their con...

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Autores principales: Keijzer, Ruben, Succi, Giovanni, Willering, Gerard, Bordini, Bernardo, Bottura, Luca, Mangiarotti, Franco J, Dhallé, Marc, Kate, Herman H J Ten
Lenguaje:eng
Publicado: 2022
Materias:
Acceso en línea:https://dx.doi.org/10.1109/TASC.2022.3153247
http://cds.cern.ch/record/2806084
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author Keijzer, Ruben
Succi, Giovanni
Willering, Gerard
Bordini, Bernardo
Bottura, Luca
Mangiarotti, Franco J
Dhallé, Marc
Kate, Herman H J Ten
author_facet Keijzer, Ruben
Succi, Giovanni
Willering, Gerard
Bordini, Bernardo
Bottura, Luca
Mangiarotti, Franco J
Dhallé, Marc
Kate, Herman H J Ten
author_sort Keijzer, Ruben
collection CERN
description In the framework of the High-Luminosity Large Hadron Collider (HL-LHC) project, 11 T dipole and MQXF quadrupole magnets employing Nb$_3$Sn technology have been tested in short and long test configurations. Nb$_3$Sn magnets are more sensitive than Nb-Ti magnets to a potential degradation of their conductors during production, testing, and cycling operation. At CERN, new diagnostic tools and measurement procedures have been developed to investigate, in detail, the performance of Nb$_3$Sn accelerator type magnets. This is accomplished by V-I measurements extracted from voltage taps on conductor sections as well as entire coils. A leading hypothesis for the cause of decaying voltages on current plateaus of the V-I measurements is the presence of an inhomogeneous defect in the Rutherford cable. Current redistribution for bypassing such defects takes place through a current diffusion process, which leads to a decaying voltage over the affected cable sections. Using the simulation software THEA, the general behavior of this phenomenon has been studied. Good qualitative agreement is found between simulation and magnet test results.
id cern-2806084
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2022
record_format invenio
spelling cern-28060842023-03-29T11:07:26Zdoi:10.1109/TASC.2022.3153247http://cds.cern.ch/record/2806084engKeijzer, RubenSucci, GiovanniWillering, GerardBordini, BernardoBottura, LucaMangiarotti, Franco JDhallé, MarcKate, Herman H J TenModelling V-I Measurements of Nb$_3$Sn Accelerator Magnets With Conductor DegradationAccelerators and Storage RingsIn the framework of the High-Luminosity Large Hadron Collider (HL-LHC) project, 11 T dipole and MQXF quadrupole magnets employing Nb$_3$Sn technology have been tested in short and long test configurations. Nb$_3$Sn magnets are more sensitive than Nb-Ti magnets to a potential degradation of their conductors during production, testing, and cycling operation. At CERN, new diagnostic tools and measurement procedures have been developed to investigate, in detail, the performance of Nb$_3$Sn accelerator type magnets. This is accomplished by V-I measurements extracted from voltage taps on conductor sections as well as entire coils. A leading hypothesis for the cause of decaying voltages on current plateaus of the V-I measurements is the presence of an inhomogeneous defect in the Rutherford cable. Current redistribution for bypassing such defects takes place through a current diffusion process, which leads to a decaying voltage over the affected cable sections. Using the simulation software THEA, the general behavior of this phenomenon has been studied. Good qualitative agreement is found between simulation and magnet test results.oai:cds.cern.ch:28060842022
spellingShingle Accelerators and Storage Rings
Keijzer, Ruben
Succi, Giovanni
Willering, Gerard
Bordini, Bernardo
Bottura, Luca
Mangiarotti, Franco J
Dhallé, Marc
Kate, Herman H J Ten
Modelling V-I Measurements of Nb$_3$Sn Accelerator Magnets With Conductor Degradation
title Modelling V-I Measurements of Nb$_3$Sn Accelerator Magnets With Conductor Degradation
title_full Modelling V-I Measurements of Nb$_3$Sn Accelerator Magnets With Conductor Degradation
title_fullStr Modelling V-I Measurements of Nb$_3$Sn Accelerator Magnets With Conductor Degradation
title_full_unstemmed Modelling V-I Measurements of Nb$_3$Sn Accelerator Magnets With Conductor Degradation
title_short Modelling V-I Measurements of Nb$_3$Sn Accelerator Magnets With Conductor Degradation
title_sort modelling v-i measurements of nb$_3$sn accelerator magnets with conductor degradation
topic Accelerators and Storage Rings
url https://dx.doi.org/10.1109/TASC.2022.3153247
http://cds.cern.ch/record/2806084
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