Simulation and Measurement of the TMCI Threshold in the LHC

The Transverse Mode Coupling Instability (TMCI) occurs in individual bunches when two transverse oscillation modes couple at high intensity. Simulations predict an instability threshold in the LHC at a single bunch intensity of $3 \cdot 10^{11}$ protons. The TMCI threshold can be inferred by measuri...

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Detalles Bibliográficos
Autores principales: Amorim, David, Antipov, Sergey, Biancacci, Nicolo, Buffat, Xavier, Carver, Lee, Métral, Elias
Lenguaje:eng
Publicado: 2018
Materias:
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.18429/JACoW-HB2018-MOP2WA05
http://cds.cern.ch/record/2640635
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author Amorim, David
Antipov, Sergey
Biancacci, Nicolo
Buffat, Xavier
Carver, Lee
Métral, Elias
author_facet Amorim, David
Antipov, Sergey
Biancacci, Nicolo
Buffat, Xavier
Carver, Lee
Métral, Elias
author_sort Amorim, David
collection CERN
description The Transverse Mode Coupling Instability (TMCI) occurs in individual bunches when two transverse oscillation modes couple at high intensity. Simulations predict an instability threshold in the LHC at a single bunch intensity of $3 \cdot 10^{11}$ protons. The TMCI threshold can be inferred by measuring the tune shift as a function of intensity. This measurement was performed in the LHC for different machine impedances and bunch intensities. The impedance was changed by varying the primary and secondary collimators gaps to increase their contribution to the resistive wall impedance. The experiment also allowed to assess the validity of the LHC impedance model in the single bunch regime, at low chromaticities.
id oai-inspirehep.net-1689705
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2018
record_format invenio
spelling oai-inspirehep.net-16897052019-09-30T06:29:59Zdoi:10.18429/JACoW-HB2018-MOP2WA05http://cds.cern.ch/record/2640635engAmorim, DavidAntipov, SergeyBiancacci, NicoloBuffat, XavierCarver, LeeMétral, EliasSimulation and Measurement of the TMCI Threshold in the LHCAccelerators and Storage RingsThe Transverse Mode Coupling Instability (TMCI) occurs in individual bunches when two transverse oscillation modes couple at high intensity. Simulations predict an instability threshold in the LHC at a single bunch intensity of $3 \cdot 10^{11}$ protons. The TMCI threshold can be inferred by measuring the tune shift as a function of intensity. This measurement was performed in the LHC for different machine impedances and bunch intensities. The impedance was changed by varying the primary and secondary collimators gaps to increase their contribution to the resistive wall impedance. The experiment also allowed to assess the validity of the LHC impedance model in the single bunch regime, at low chromaticities.oai:inspirehep.net:16897052018
spellingShingle Accelerators and Storage Rings
Amorim, David
Antipov, Sergey
Biancacci, Nicolo
Buffat, Xavier
Carver, Lee
Métral, Elias
Simulation and Measurement of the TMCI Threshold in the LHC
title Simulation and Measurement of the TMCI Threshold in the LHC
title_full Simulation and Measurement of the TMCI Threshold in the LHC
title_fullStr Simulation and Measurement of the TMCI Threshold in the LHC
title_full_unstemmed Simulation and Measurement of the TMCI Threshold in the LHC
title_short Simulation and Measurement of the TMCI Threshold in the LHC
title_sort simulation and measurement of the tmci threshold in the lhc
topic Accelerators and Storage Rings
url https://dx.doi.org/10.18429/JACoW-HB2018-MOP2WA05
http://cds.cern.ch/record/2640635
work_keys_str_mv AT amorimdavid simulationandmeasurementofthetmcithresholdinthelhc
AT antipovsergey simulationandmeasurementofthetmcithresholdinthelhc
AT biancaccinicolo simulationandmeasurementofthetmcithresholdinthelhc
AT buffatxavier simulationandmeasurementofthetmcithresholdinthelhc
AT carverlee simulationandmeasurementofthetmcithresholdinthelhc
AT metralelias simulationandmeasurementofthetmcithresholdinthelhc

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