The Ghost Train Instability (MDs 2066 and 2936)

This notes describes experimental studies of the octupole strength required to stabilise bunch trains at 6.5 TeV in the LHC, performed over 3 MD blocks in 2017. An instability affecting the bunches at the head of the train in the horizontal plane of B1 was observed and could not be stabilised with...

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Autores principales: Carver, Lee Robert, Alemany Fernandez, Reyes, Amorim, David, Antipov, Sergey, Barraud, Laurent, Biancacci, Nicolo, Buffat, Xavier, Crockford, Guy, Hemelsoet, Georges-Henry, Levens, Tom, Mazzacano, Giacomo, Metral, Elias, Ponce, Laurette, Ribes Metidieri, Ariadna, Salvant, Benoit, Schenk, Michael, Soderen, Martin, Soubelet, Felix Pol Gaston, Trad, Georges
Lenguaje:eng
Publicado: 2018
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/2305918
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author Carver, Lee Robert
Alemany Fernandez, Reyes
Amorim, David
Antipov, Sergey
Barraud, Laurent
Biancacci, Nicolo
Buffat, Xavier
Crockford, Guy
Hemelsoet, Georges-Henry
Levens, Tom
Mazzacano, Giacomo
Metral, Elias
Ponce, Laurette
Ribes Metidieri, Ariadna
Salvant, Benoit
Schenk, Michael
Soderen, Martin
Soubelet, Felix Pol Gaston
Trad, Georges
author_facet Carver, Lee Robert
Alemany Fernandez, Reyes
Amorim, David
Antipov, Sergey
Barraud, Laurent
Biancacci, Nicolo
Buffat, Xavier
Crockford, Guy
Hemelsoet, Georges-Henry
Levens, Tom
Mazzacano, Giacomo
Metral, Elias
Ponce, Laurette
Ribes Metidieri, Ariadna
Salvant, Benoit
Schenk, Michael
Soderen, Martin
Soubelet, Felix Pol Gaston
Trad, Georges
author_sort Carver, Lee Robert
collection CERN
description This notes describes experimental studies of the octupole strength required to stabilise bunch trains at 6.5 TeV in the LHC, performed over 3 MD blocks in 2017. An instability affecting the bunches at the head of the train in the horizontal plane of B1 was observed and could not be stabilised with the maximum octupole current available in the first 2 MD tests. The instability was no longer observed in the last experiment in similar conditions. Eventually, the measured octupole threshold for 25 ns trains was found slightly above the single bunch stability threshold, within a factor ≈2.2 with respect to predictions based on the impedance model.
id cern-2305918
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2018
record_format invenio
spelling cern-23059182019-09-30T06:29:59Zhttp://cds.cern.ch/record/2305918engCarver, Lee RobertAlemany Fernandez, ReyesAmorim, DavidAntipov, SergeyBarraud, LaurentBiancacci, NicoloBuffat, XavierCrockford, GuyHemelsoet, Georges-HenryLevens, TomMazzacano, GiacomoMetral, EliasPonce, LauretteRibes Metidieri, AriadnaSalvant, BenoitSchenk, MichaelSoderen, MartinSoubelet, Felix Pol GastonTrad, GeorgesThe Ghost Train Instability (MDs 2066 and 2936)Accelerators and Storage RingsThis notes describes experimental studies of the octupole strength required to stabilise bunch trains at 6.5 TeV in the LHC, performed over 3 MD blocks in 2017. An instability affecting the bunches at the head of the train in the horizontal plane of B1 was observed and could not be stabilised with the maximum octupole current available in the first 2 MD tests. The instability was no longer observed in the last experiment in similar conditions. Eventually, the measured octupole threshold for 25 ns trains was found slightly above the single bunch stability threshold, within a factor ≈2.2 with respect to predictions based on the impedance model.CERN-ACC-NOTE-2018-0013oai:cds.cern.ch:23059182018-02-26
spellingShingle Accelerators and Storage Rings
Carver, Lee Robert
Alemany Fernandez, Reyes
Amorim, David
Antipov, Sergey
Barraud, Laurent
Biancacci, Nicolo
Buffat, Xavier
Crockford, Guy
Hemelsoet, Georges-Henry
Levens, Tom
Mazzacano, Giacomo
Metral, Elias
Ponce, Laurette
Ribes Metidieri, Ariadna
Salvant, Benoit
Schenk, Michael
Soderen, Martin
Soubelet, Felix Pol Gaston
Trad, Georges
The Ghost Train Instability (MDs 2066 and 2936)
title The Ghost Train Instability (MDs 2066 and 2936)
title_full The Ghost Train Instability (MDs 2066 and 2936)
title_fullStr The Ghost Train Instability (MDs 2066 and 2936)
title_full_unstemmed The Ghost Train Instability (MDs 2066 and 2936)
title_short The Ghost Train Instability (MDs 2066 and 2936)
title_sort ghost train instability (mds 2066 and 2936)
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/2305918
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