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Characterisation of Magnetic Shielding Material for HL-LHC Crab Cavities

To guarantee optimum performance, the crab cavities for the high-luminosity upgrade of CERN's LHC need to be shielded from external magnetic fields. Consequently, they will be enclosed by two layers of magnetic shielding, of which the inner is immersed in superfluid helium at 2 K. A Ni-based hi...

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Autores principales: Eiler, Konrad, Arpaia, Pasquale, Buzio, Marco, Capatina, Ofelia, Langeslag, Stefanie, Parrella, Alessandro, Templeton, Niklas
Lenguaje:eng
Publicado: 2018
Materias:
Acceso en línea:https://dx.doi.org/10.18429/JACoW-SRF2017-MOPB089
http://cds.cern.ch/record/2674098
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author Eiler, Konrad
Arpaia, Pasquale
Buzio, Marco
Capatina, Ofelia
Langeslag, Stefanie
Parrella, Alessandro
Templeton, Niklas
author_facet Eiler, Konrad
Arpaia, Pasquale
Buzio, Marco
Capatina, Ofelia
Langeslag, Stefanie
Parrella, Alessandro
Templeton, Niklas
author_sort Eiler, Konrad
collection CERN
description To guarantee optimum performance, the crab cavities for the high-luminosity upgrade of CERN's LHC need to be shielded from external magnetic fields. Consequently, they will be enclosed by two layers of magnetic shielding, of which the inner is immersed in superfluid helium at 2 K. A Ni-based high-permeability material with a tailored composition and a designated heat treatment is applied. Its magnetic properties at cryogenic temperature are however not yet fully assessed. Especially the effect of deformation on magnetic properties has not been thoroughly investigated, however strain effects may have severe consequences. A magnetic measurement set-up has been developed, and the magnetic permeability at room temperature and at cryogenic temperatures is evaluated, showing that the maximum relative permeability at 4 K exceeds the design criteria of 100, 000. Measurements of the magnetic permeability after introduction of uniaxial plastic deformation between 0% and 3% are conducted by means of an Epstein frame. Results show that deformation induces significant decrease of the magnetic performance, underlining that particular care must be taken during all stages of handling and operation.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2018
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spelling oai-inspirehep.net-16570862022-08-17T12:59:50Zdoi:10.18429/JACoW-SRF2017-MOPB089http://cds.cern.ch/record/2674098engEiler, KonradArpaia, PasqualeBuzio, MarcoCapatina, OfeliaLangeslag, StefanieParrella, AlessandroTempleton, NiklasCharacterisation of Magnetic Shielding Material for HL-LHC Crab CavitiesAccelerators and Storage RingsTo guarantee optimum performance, the crab cavities for the high-luminosity upgrade of CERN's LHC need to be shielded from external magnetic fields. Consequently, they will be enclosed by two layers of magnetic shielding, of which the inner is immersed in superfluid helium at 2 K. A Ni-based high-permeability material with a tailored composition and a designated heat treatment is applied. Its magnetic properties at cryogenic temperature are however not yet fully assessed. Especially the effect of deformation on magnetic properties has not been thoroughly investigated, however strain effects may have severe consequences. A magnetic measurement set-up has been developed, and the magnetic permeability at room temperature and at cryogenic temperatures is evaluated, showing that the maximum relative permeability at 4 K exceeds the design criteria of 100, 000. Measurements of the magnetic permeability after introduction of uniaxial plastic deformation between 0% and 3% are conducted by means of an Epstein frame. Results show that deformation induces significant decrease of the magnetic performance, underlining that particular care must be taken during all stages of handling and operation.oai:inspirehep.net:16570862018
spellingShingle Accelerators and Storage Rings
Eiler, Konrad
Arpaia, Pasquale
Buzio, Marco
Capatina, Ofelia
Langeslag, Stefanie
Parrella, Alessandro
Templeton, Niklas
Characterisation of Magnetic Shielding Material for HL-LHC Crab Cavities
title Characterisation of Magnetic Shielding Material for HL-LHC Crab Cavities
title_full Characterisation of Magnetic Shielding Material for HL-LHC Crab Cavities
title_fullStr Characterisation of Magnetic Shielding Material for HL-LHC Crab Cavities
title_full_unstemmed Characterisation of Magnetic Shielding Material for HL-LHC Crab Cavities
title_short Characterisation of Magnetic Shielding Material for HL-LHC Crab Cavities
title_sort characterisation of magnetic shielding material for hl-lhc crab cavities
topic Accelerators and Storage Rings
url https://dx.doi.org/10.18429/JACoW-SRF2017-MOPB089
http://cds.cern.ch/record/2674098
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