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Beam-beam effect with an exterminal noise in LHC

Proton beam do not have any damping mechanism for an incoherent betatron motion. A noise, which kicks beam particles in the transverse plane, gives a coherent betatron amplitude. If the system is linear, the coherent motion remains in an amplitude range. Nonlinear force, beam-beam and beam-electron...

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Detalles Bibliográficos
Autor principal: Ohmi, K
Lenguaje:eng
Publicado: CERN 2007
Materias:
Acceso en línea:https://dx.doi.org/10.5170/CERN-2007-002.90
http://cds.cern.ch/record/1045191
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author Ohmi, K
author_facet Ohmi, K
author_sort Ohmi, K
collection CERN
description Proton beam do not have any damping mechanism for an incoherent betatron motion. A noise, which kicks beam particles in the transverse plane, gives a coherent betatron amplitude. If the system is linear, the coherent motion remains in an amplitude range. Nonlinear force, beam-beam and beam-electron cloud interactions, causes a decoherence for the betatron motion with keeping an amplitude of each beam particle, with the result that an emittance growth arises. We focus only a fast noise, the correlation time is 1-100 turns. Slower noise is less serious, because it is regarded as an adiabatic change like closed orbit change. As sources of the noise, we consider the bunch by bunch feedback system and phase jitter of cavities which turns to transverse noise via Crab cavity.
id cern-1045191
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2007
publisher CERN
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spelling cern-10451912019-09-30T06:29:59Zdoi:10.5170/CERN-2007-002.90http://cds.cern.ch/record/1045191engOhmi, KBeam-beam effect with an exterminal noise in LHCDetectors and Experimental TechniquesProton beam do not have any damping mechanism for an incoherent betatron motion. A noise, which kicks beam particles in the transverse plane, gives a coherent betatron amplitude. If the system is linear, the coherent motion remains in an amplitude range. Nonlinear force, beam-beam and beam-electron cloud interactions, causes a decoherence for the betatron motion with keeping an amplitude of each beam particle, with the result that an emittance growth arises. We focus only a fast noise, the correlation time is 1-100 turns. Slower noise is less serious, because it is regarded as an adiabatic change like closed orbit change. As sources of the noise, we consider the bunch by bunch feedback system and phase jitter of cavities which turns to transverse noise via Crab cavity.CERNoai:cds.cern.ch:10451912007
spellingShingle Detectors and Experimental Techniques
Ohmi, K
Beam-beam effect with an exterminal noise in LHC
title Beam-beam effect with an exterminal noise in LHC
title_full Beam-beam effect with an exterminal noise in LHC
title_fullStr Beam-beam effect with an exterminal noise in LHC
title_full_unstemmed Beam-beam effect with an exterminal noise in LHC
title_short Beam-beam effect with an exterminal noise in LHC
title_sort beam-beam effect with an exterminal noise in lhc
topic Detectors and Experimental Techniques
url https://dx.doi.org/10.5170/CERN-2007-002.90
http://cds.cern.ch/record/1045191
work_keys_str_mv AT ohmik beambeameffectwithanexterminalnoiseinlhc