LHC MD 1087: Controlled Longitudinal Emittance Blow-up with Short Bunches

The aim of the MD was to study the controlled longitudinal emittance blow-up applied during the ramp with bunches that are slightly shorter than operational. Earlier MDs in 2015 have shown that with a short target bunch length, the blow-up is less controlled and a bifurcation of bunch lengths occurs...

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Autores principales: Timko, Helga, Baudrenghien, Philippe, Esteban Muller, Juan, Jaussi, Michael, Lasheen, Alexandre, Shaposhnikova, Elena
Lenguaje:eng
Publicado: 2017
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/2257562
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author Timko, Helga
Baudrenghien, Philippe
Esteban Muller, Juan
Jaussi, Michael
Lasheen, Alexandre
Shaposhnikova, Elena
author_facet Timko, Helga
Baudrenghien, Philippe
Esteban Muller, Juan
Jaussi, Michael
Lasheen, Alexandre
Shaposhnikova, Elena
author_sort Timko, Helga
collection CERN
description The aim of the MD was to study the controlled longitudinal emittance blow-up applied during the ramp with bunches that are slightly shorter than operational. Earlier MDs in 2015 have shown that with a short target bunch length, the blow-up is less controlled and a bifurcation of bunch lengths occurs. The presented measurements show that the bifurcation is independent of the presence of the bunch length feedback, pointing towards an intensity-dependent phenomenon, originating from a synchrotron frequency shift with intensity. Accurate measurements of synchrotron frequency shift with intensity are presented as well. The measurements took place between 22nd August 2016, 19:00 and 23rd August 2016, 04:00.
id cern-2257562
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2017
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spelling cern-22575622019-09-30T06:29:59Zhttp://cds.cern.ch/record/2257562engTimko, HelgaBaudrenghien, PhilippeEsteban Muller, JuanJaussi, MichaelLasheen, AlexandreShaposhnikova, ElenaLHC MD 1087: Controlled Longitudinal Emittance Blow-up with Short BunchesAccelerators and Storage RingsThe aim of the MD was to study the controlled longitudinal emittance blow-up applied during the ramp with bunches that are slightly shorter than operational. Earlier MDs in 2015 have shown that with a short target bunch length, the blow-up is less controlled and a bifurcation of bunch lengths occurs. The presented measurements show that the bifurcation is independent of the presence of the bunch length feedback, pointing towards an intensity-dependent phenomenon, originating from a synchrotron frequency shift with intensity. Accurate measurements of synchrotron frequency shift with intensity are presented as well. The measurements took place between 22nd August 2016, 19:00 and 23rd August 2016, 04:00.CERN-ACC-NOTE-2017-0018oai:cds.cern.ch:22575622017-03-30
spellingShingle Accelerators and Storage Rings
Timko, Helga
Baudrenghien, Philippe
Esteban Muller, Juan
Jaussi, Michael
Lasheen, Alexandre
Shaposhnikova, Elena
LHC MD 1087: Controlled Longitudinal Emittance Blow-up with Short Bunches
title LHC MD 1087: Controlled Longitudinal Emittance Blow-up with Short Bunches
title_full LHC MD 1087: Controlled Longitudinal Emittance Blow-up with Short Bunches
title_fullStr LHC MD 1087: Controlled Longitudinal Emittance Blow-up with Short Bunches
title_full_unstemmed LHC MD 1087: Controlled Longitudinal Emittance Blow-up with Short Bunches
title_short LHC MD 1087: Controlled Longitudinal Emittance Blow-up with Short Bunches
title_sort lhc md 1087: controlled longitudinal emittance blow-up with short bunches
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/2257562
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AT baudrenghienphilippe lhcmd1087controlledlongitudinalemittanceblowupwithshortbunches
AT estebanmullerjuan lhcmd1087controlledlongitudinalemittanceblowupwithshortbunches
AT jaussimichael lhcmd1087controlledlongitudinalemittanceblowupwithshortbunches
AT lasheenalexandre lhcmd1087controlledlongitudinalemittanceblowupwithshortbunches
AT shaposhnikovaelena lhcmd1087controlledlongitudinalemittanceblowupwithshortbunches

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