Longitudinal Oscillations with Batch Injection in the LHC

Long lasting dipole oscillations have been observed at injection in the LHC, with 50 ns bunch spacing, 1.5 ns 4-sigma bunch length (0.5 eVs at SPS extraction), and 1.2E11 p/bunch. During the MD we have observed these oscillations with four different fillings, varying the total beam current, the numb...

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Detalles Bibliográficos
Autores principales: Argyropoulos, T, Bhat, C, Baudrenghien, P, Mastoridis, T, Muller, J, Papotti, G, Shaposhnikova, E, Tuckmantel, J, Valuch, D
Lenguaje:eng
Publicado: 2011
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/1388943
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author Argyropoulos, T
Bhat, C
Baudrenghien, P
Mastoridis, T
Muller, J
Papotti, G
Shaposhnikova, E
Tuckmantel, J
Valuch, D
author_facet Argyropoulos, T
Bhat, C
Baudrenghien, P
Mastoridis, T
Muller, J
Papotti, G
Shaposhnikova, E
Tuckmantel, J
Valuch, D
author_sort Argyropoulos, T
collection CERN
description Long lasting dipole oscillations have been observed at injection in the LHC, with 50 ns bunch spacing, 1.5 ns 4-sigma bunch length (0.5 eVs at SPS extraction), and 1.2E11 p/bunch. During the MD we have observed these oscillations with four different fillings, varying the total beam current, the number of bunches per batch, and the distance between batches. None of these parameters has a significant influence. The effect does not appear to be a multi-bunch instability. The MD has revealed that the amplitude of dipole oscillation initially grows for 5-10 min after injection, resulting in fast bunch lengthening. Then very slow damping takes place (~ 30 minutes time constant). A dependence on bunch length has been observed.
id cern-1388943
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2011
record_format invenio
spelling cern-13889432019-09-30T06:29:59Zhttp://cds.cern.ch/record/1388943engArgyropoulos, TBhat, CBaudrenghien, PMastoridis, TMuller, JPapotti, GShaposhnikova, ETuckmantel, JValuch, DLongitudinal Oscillations with Batch Injection in the LHCAccelerators and Storage RingsLong lasting dipole oscillations have been observed at injection in the LHC, with 50 ns bunch spacing, 1.5 ns 4-sigma bunch length (0.5 eVs at SPS extraction), and 1.2E11 p/bunch. During the MD we have observed these oscillations with four different fillings, varying the total beam current, the number of bunches per batch, and the distance between batches. None of these parameters has a significant influence. The effect does not appear to be a multi-bunch instability. The MD has revealed that the amplitude of dipole oscillation initially grows for 5-10 min after injection, resulting in fast bunch lengthening. Then very slow damping takes place (~ 30 minutes time constant). A dependence on bunch length has been observed.CERN-ATS-Note-2011-031 MDoai:cds.cern.ch:13889432011-10-11
spellingShingle Accelerators and Storage Rings
Argyropoulos, T
Bhat, C
Baudrenghien, P
Mastoridis, T
Muller, J
Papotti, G
Shaposhnikova, E
Tuckmantel, J
Valuch, D
Longitudinal Oscillations with Batch Injection in the LHC
title Longitudinal Oscillations with Batch Injection in the LHC
title_full Longitudinal Oscillations with Batch Injection in the LHC
title_fullStr Longitudinal Oscillations with Batch Injection in the LHC
title_full_unstemmed Longitudinal Oscillations with Batch Injection in the LHC
title_short Longitudinal Oscillations with Batch Injection in the LHC
title_sort longitudinal oscillations with batch injection in the lhc
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/1388943
work_keys_str_mv AT argyropoulost longitudinaloscillationswithbatchinjectioninthelhc
AT bhatc longitudinaloscillationswithbatchinjectioninthelhc
AT baudrenghienp longitudinaloscillationswithbatchinjectioninthelhc
AT mastoridist longitudinaloscillationswithbatchinjectioninthelhc
AT mullerj longitudinaloscillationswithbatchinjectioninthelhc
AT papottig longitudinaloscillationswithbatchinjectioninthelhc
AT shaposhnikovae longitudinaloscillationswithbatchinjectioninthelhc
AT tuckmantelj longitudinaloscillationswithbatchinjectioninthelhc
AT valuchd longitudinaloscillationswithbatchinjectioninthelhc

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