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Verification by RF measurements of new HOM mitigation scheme developed for future SPS 33-cell accelerating structures
Longitudinal higher-order modes (HOMs) at a frequency of around 630 MHz in the 200 MHz travelling wave RF structures currently limit the beam intensities in the CERN SPS to less than that required by the High Luminosity (HL-) LHC. In the framework of the LHC Injectors Upgrade (LIU) project, the perf...
Autores principales: | , , |
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Lenguaje: | eng |
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2019
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.18429/JACoW-IPAC2019-MOPGW076 http://cds.cern.ch/record/2695081 |
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author | Kramer, Patrick Farricker, Aaron Vollinger, Christine |
author_facet | Kramer, Patrick Farricker, Aaron Vollinger, Christine |
author_sort | Kramer, Patrick |
collection | CERN |
description | Longitudinal higher-order modes (HOMs) at a frequency of around 630 MHz in the 200 MHz travelling wave RF structures currently limit the beam intensities in the CERN SPS to less than that required by the High Luminosity (HL-) LHC. In the framework of the LHC Injectors Upgrade (LIU) project, the performance of the already existing HOM damping scheme for these standing wave modes must be improved. This involves improving the existing HOM-couplers as well as the possible use of a new mitigation technique via the insertion of resonant posts in some cells of the multi-cell structures. The development of the new damping scheme has been performed using theoretical analysis of the cavity-coupler interaction in conjunction with full-wave electromagnetic (EM) field simulations. This contribution will show the verification of the improved HOM damping performance by measurements on a single section with 11 cells and on the future 33-cell structures. The parasitic impact of the damping scheme on the travelling wave fundamental passband (FPB) will also be presented. |
id | oai-inspirehep.net-1743343 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2019 |
record_format | invenio |
spelling | oai-inspirehep.net-17433432020-09-28T09:50:08Zdoi:10.18429/JACoW-IPAC2019-MOPGW076http://cds.cern.ch/record/2695081engKramer, PatrickFarricker, AaronVollinger, ChristineVerification by RF measurements of new HOM mitigation scheme developed for future SPS 33-cell accelerating structuresAccelerators and Storage RingsLongitudinal higher-order modes (HOMs) at a frequency of around 630 MHz in the 200 MHz travelling wave RF structures currently limit the beam intensities in the CERN SPS to less than that required by the High Luminosity (HL-) LHC. In the framework of the LHC Injectors Upgrade (LIU) project, the performance of the already existing HOM damping scheme for these standing wave modes must be improved. This involves improving the existing HOM-couplers as well as the possible use of a new mitigation technique via the insertion of resonant posts in some cells of the multi-cell structures. The development of the new damping scheme has been performed using theoretical analysis of the cavity-coupler interaction in conjunction with full-wave electromagnetic (EM) field simulations. This contribution will show the verification of the improved HOM damping performance by measurements on a single section with 11 cells and on the future 33-cell structures. The parasitic impact of the damping scheme on the travelling wave fundamental passband (FPB) will also be presented.CERN-ACC-2019-090oai:inspirehep.net:17433432019 |
spellingShingle | Accelerators and Storage Rings Kramer, Patrick Farricker, Aaron Vollinger, Christine Verification by RF measurements of new HOM mitigation scheme developed for future SPS 33-cell accelerating structures |
title | Verification by RF measurements of new HOM mitigation scheme developed for future SPS 33-cell accelerating structures |
title_full | Verification by RF measurements of new HOM mitigation scheme developed for future SPS 33-cell accelerating structures |
title_fullStr | Verification by RF measurements of new HOM mitigation scheme developed for future SPS 33-cell accelerating structures |
title_full_unstemmed | Verification by RF measurements of new HOM mitigation scheme developed for future SPS 33-cell accelerating structures |
title_short | Verification by RF measurements of new HOM mitigation scheme developed for future SPS 33-cell accelerating structures |
title_sort | verification by rf measurements of new hom mitigation scheme developed for future sps 33-cell accelerating structures |
topic | Accelerators and Storage Rings |
url | https://dx.doi.org/10.18429/JACoW-IPAC2019-MOPGW076 http://cds.cern.ch/record/2695081 |
work_keys_str_mv | AT kramerpatrick verificationbyrfmeasurementsofnewhommitigationschemedevelopedforfuturesps33cellacceleratingstructures AT farrickeraaron verificationbyrfmeasurementsofnewhommitigationschemedevelopedforfuturesps33cellacceleratingstructures AT vollingerchristine verificationbyrfmeasurementsofnewhommitigationschemedevelopedforfuturesps33cellacceleratingstructures |