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RF Studies of LHC Beams in the SPS

The first dedicated MD session in 2003 was mainly used to reestablish the situation achieved at the end of last year when stable LHC beam with nominal parameters was obtained on the flat top. To stabilise the beam the 800~MHz RF system was used during the cycle in bunch shortening mode together with...

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Autores principales: Baudrenghien, P, Bohl, T, Linnecar, Trevor Paul R, Shaposhnikova, Elena, Tückmantel, Joachim, Wehrle, U
Lenguaje:eng
Publicado: 2003
Materias:
Acceso en línea:http://cds.cern.ch/record/702802
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author Baudrenghien, P
Bohl, T
Linnecar, Trevor Paul R
Shaposhnikova, Elena
Tückmantel, Joachim
Wehrle, U
author_facet Baudrenghien, P
Bohl, T
Linnecar, Trevor Paul R
Shaposhnikova, Elena
Tückmantel, Joachim
Wehrle, U
author_sort Baudrenghien, P
collection CERN
description The first dedicated MD session in 2003 was mainly used to reestablish the situation achieved at the end of last year when stable LHC beam with nominal parameters was obtained on the flat top. To stabilise the beam the 800~MHz RF system was used during the cycle in bunch shortening mode together with controlled emittance blow-up. This year emittance blow-up during the ramp was performed using excitation at the synchrotron frequency via the phase loop of the 200~MHz RF system. No beam loss was observed with this method. Some part of MD time was devoted to studies of localised (affecting only a few bunches) dipole instability seen on phase discriminator of the longitudinal damper on the flat bottom and during the ramp. This instability was not noticed last year.
id cern-702802
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2003
record_format invenio
spelling cern-7028022023-02-17T10:08:20Zhttp://cds.cern.ch/record/702802engBaudrenghien, PBohl, TLinnecar, Trevor Paul RShaposhnikova, ElenaTückmantel, JoachimWehrle, URF Studies of LHC Beams in the SPSAccelerators and Storage RingsThe first dedicated MD session in 2003 was mainly used to reestablish the situation achieved at the end of last year when stable LHC beam with nominal parameters was obtained on the flat top. To stabilise the beam the 800~MHz RF system was used during the cycle in bunch shortening mode together with controlled emittance blow-up. This year emittance blow-up during the ramp was performed using excitation at the synchrotron frequency via the phase loop of the 200~MHz RF system. No beam loss was observed with this method. Some part of MD time was devoted to studies of localised (affecting only a few bunches) dipole instability seen on phase discriminator of the longitudinal damper on the flat bottom and during the ramp. This instability was not noticed last year.AB-Note-2003-071-MDoai:cds.cern.ch:7028022003-10-02
spellingShingle Accelerators and Storage Rings
Baudrenghien, P
Bohl, T
Linnecar, Trevor Paul R
Shaposhnikova, Elena
Tückmantel, Joachim
Wehrle, U
RF Studies of LHC Beams in the SPS
title RF Studies of LHC Beams in the SPS
title_full RF Studies of LHC Beams in the SPS
title_fullStr RF Studies of LHC Beams in the SPS
title_full_unstemmed RF Studies of LHC Beams in the SPS
title_short RF Studies of LHC Beams in the SPS
title_sort rf studies of lhc beams in the sps
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/702802
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AT bohlt rfstudiesoflhcbeamsinthesps
AT linnecartrevorpaulr rfstudiesoflhcbeamsinthesps
AT shaposhnikovaelena rfstudiesoflhcbeamsinthesps
AT tuckmanteljoachim rfstudiesoflhcbeamsinthesps
AT wehrleu rfstudiesoflhcbeamsinthesps