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HL-LHC Crab Cavity HOM Couplers: Challenges and Results

To compensate for the detrimental effect of the crossing angle on luminosity production in the High Luminosity Large Hadron Collider’s (HL-LHC) interaction regions, superconducting crab cavities (vertical and horizontal) will be installed at the two interaction regions of the ATLAS and CMS experimen...

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Detalles Bibliográficos
Autores principales: Mitchell, James, Calaga, Rama, Montesinos, Eric
Lenguaje:eng
Publicado: 2022
Materias:
Acceso en línea:https://dx.doi.org/10.18429/JACoW-IPAC2022-TUPOTK064
http://cds.cern.ch/record/2845819
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author Mitchell, James
Calaga, Rama
Montesinos, Eric
author_facet Mitchell, James
Calaga, Rama
Montesinos, Eric
author_sort Mitchell, James
collection CERN
description To compensate for the detrimental effect of the crossing angle on luminosity production in the High Luminosity Large Hadron Collider’s (HL-LHC) interaction regions, superconducting crab cavities (vertical and horizontal) will be installed at the two interaction regions of the ATLAS and CMS experiments. Both cavity designs use multiple Higher Order Mode (HOM) couplers to reduce beam instabilities and heat loads caused by the very high proton current in the HL-LHC. The conceptual RF designs of the HOM couplers are firstly presented, evaluating HOM damping requirements, fundamental mode rejection and dynamic heat load constraints. A special focus is given to the coupler’s characteristic impedance (Z0), to improve the robustness during transport and operation. Following this, RF measurements of the HOM couplers before installation, installed on the superconducting cavities and with a circulating proton beam are detailed, analysing deviations from the simulated cases.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2022
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spelling cern-28458192023-01-11T21:31:23Zdoi:10.18429/JACoW-IPAC2022-TUPOTK064http://cds.cern.ch/record/2845819engMitchell, JamesCalaga, RamaMontesinos, EricHL-LHC Crab Cavity HOM Couplers: Challenges and ResultsAccelerators and Storage RingsTo compensate for the detrimental effect of the crossing angle on luminosity production in the High Luminosity Large Hadron Collider’s (HL-LHC) interaction regions, superconducting crab cavities (vertical and horizontal) will be installed at the two interaction regions of the ATLAS and CMS experiments. Both cavity designs use multiple Higher Order Mode (HOM) couplers to reduce beam instabilities and heat loads caused by the very high proton current in the HL-LHC. The conceptual RF designs of the HOM couplers are firstly presented, evaluating HOM damping requirements, fundamental mode rejection and dynamic heat load constraints. A special focus is given to the coupler’s characteristic impedance (Z0), to improve the robustness during transport and operation. Following this, RF measurements of the HOM couplers before installation, installed on the superconducting cavities and with a circulating proton beam are detailed, analysing deviations from the simulated cases.oai:cds.cern.ch:28458192022
spellingShingle Accelerators and Storage Rings
Mitchell, James
Calaga, Rama
Montesinos, Eric
HL-LHC Crab Cavity HOM Couplers: Challenges and Results
title HL-LHC Crab Cavity HOM Couplers: Challenges and Results
title_full HL-LHC Crab Cavity HOM Couplers: Challenges and Results
title_fullStr HL-LHC Crab Cavity HOM Couplers: Challenges and Results
title_full_unstemmed HL-LHC Crab Cavity HOM Couplers: Challenges and Results
title_short HL-LHC Crab Cavity HOM Couplers: Challenges and Results
title_sort hl-lhc crab cavity hom couplers: challenges and results
topic Accelerators and Storage Rings
url https://dx.doi.org/10.18429/JACoW-IPAC2022-TUPOTK064
http://cds.cern.ch/record/2845819
work_keys_str_mv AT mitchelljames hllhccrabcavityhomcouplerschallengesandresults
AT calagarama hllhccrabcavityhomcouplerschallengesandresults
AT montesinoseric hllhccrabcavityhomcouplerschallengesandresults