LHC MD 652: Coupled-Bunch Instability with Smaller Emittance (all HOMs)

The aim of the MD was to measure the coupled-bunch stability from all HOM impedances, with a reduced longitudinal emittance in order to explore the HL-LHC conditions. The acceleration ramp was performed with the nominal beams of 2016, but a reduced target bunch length and RF voltage. With this reduc...

Descripción completa

Detalles Bibliográficos
Autores principales: Esteban Muller, Juan, shaposhnikova, Elena, Timko, Helga
Lenguaje:eng
Publicado: 2017
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/2257554
_version_ 1780953800530460672
author Esteban Muller, Juan
shaposhnikova, Elena
Timko, Helga
author_facet Esteban Muller, Juan
shaposhnikova, Elena
Timko, Helga
author_sort Esteban Muller, Juan
collection CERN
description The aim of the MD was to measure the coupled-bunch stability from all HOM impedances, with a reduced longitudinal emittance in order to explore the HL-LHC conditions. The acceleration ramp was performed with the nominal beams of 2016, but a reduced target bunch length and RF voltage. With this reduced emittance, the beam remained close but above the single-bunch stability threshold. No coupled-bunch oscillations were observed, so we can conclude that the stability threshold for coupled-bunch instability is not lower than the single-bunch threshold. An interesting observation in the MD was the long-lasting injection oscillations, whose traces can still be seen at arrival to flat top; in agreement with observations in earlier MDs. The measurements took place between 28th October 20:00 and 29th October 05:10.
id cern-2257554
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2017
record_format invenio
spelling cern-22575542022-04-21T08:55:13Zhttp://cds.cern.ch/record/2257554engEsteban Muller, Juanshaposhnikova, ElenaTimko, HelgaLHC MD 652: Coupled-Bunch Instability with Smaller Emittance (all HOMs)Accelerators and Storage RingsThe aim of the MD was to measure the coupled-bunch stability from all HOM impedances, with a reduced longitudinal emittance in order to explore the HL-LHC conditions. The acceleration ramp was performed with the nominal beams of 2016, but a reduced target bunch length and RF voltage. With this reduced emittance, the beam remained close but above the single-bunch stability threshold. No coupled-bunch oscillations were observed, so we can conclude that the stability threshold for coupled-bunch instability is not lower than the single-bunch threshold. An interesting observation in the MD was the long-lasting injection oscillations, whose traces can still be seen at arrival to flat top; in agreement with observations in earlier MDs. The measurements took place between 28th October 20:00 and 29th October 05:10.CERN-ACC-NOTE-2017-0017oai:cds.cern.ch:22575542017-03-30
spellingShingle Accelerators and Storage Rings
Esteban Muller, Juan
shaposhnikova, Elena
Timko, Helga
LHC MD 652: Coupled-Bunch Instability with Smaller Emittance (all HOMs)
title LHC MD 652: Coupled-Bunch Instability with Smaller Emittance (all HOMs)
title_full LHC MD 652: Coupled-Bunch Instability with Smaller Emittance (all HOMs)
title_fullStr LHC MD 652: Coupled-Bunch Instability with Smaller Emittance (all HOMs)
title_full_unstemmed LHC MD 652: Coupled-Bunch Instability with Smaller Emittance (all HOMs)
title_short LHC MD 652: Coupled-Bunch Instability with Smaller Emittance (all HOMs)
title_sort lhc md 652: coupled-bunch instability with smaller emittance (all homs)
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/2257554
work_keys_str_mv AT estebanmullerjuan lhcmd652coupledbunchinstabilitywithsmalleremittanceallhoms
AT shaposhnikovaelena lhcmd652coupledbunchinstabilitywithsmalleremittanceallhoms
AT timkohelga lhcmd652coupledbunchinstabilitywithsmalleremittanceallhoms

Ejemplares similares