Wall-Current-Monitor based Ghost and Satellite Bunch Detection in the CERN PS and the LHC Accelerators

While most LHC detectors and instrumentation systems are optimised for a nominal bunch spacing of 25 ns, the LHC RF cavities themselves operate at the 10th harmonic of the maximum bunch frequency. Due to the beam production scheme and transfers in the injector chain, part of the nominally ‘empty’ RF...

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Detalles Bibliográficos
Autores principales: Steinhagen, R J, Bart-Pedersen, S, Belleman, J, Bohl, T, Damerau, H
Lenguaje:eng
Publicado: 2012
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/1476075
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author Steinhagen, R J
Bart-Pedersen, S
Belleman, J
Bohl, T
Damerau, H
author_facet Steinhagen, R J
Bart-Pedersen, S
Belleman, J
Bohl, T
Damerau, H
author_sort Steinhagen, R J
collection CERN
description While most LHC detectors and instrumentation systems are optimised for a nominal bunch spacing of 25 ns, the LHC RF cavities themselves operate at the 10th harmonic of the maximum bunch frequency. Due to the beam production scheme and transfers in the injector chain, part of the nominally ‘empty’ RF buckets may contain particles, referred to as ghost or satellite bunches. These populations must be accurately quantified for high-precision experiments, luminosity calibration and control of parasitic particle encounters at the four LHC interaction points. This contribution summarises the wall-current-monitor based ghost and satellite bunch measurements in CERN’s PS and LHC accelerators. Instrumentation set-up, post-processing and achieved performance are discussed.
id cern-1476075
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2012
record_format invenio
spelling cern-14760752022-08-17T13:25:51Zhttp://cds.cern.ch/record/1476075engSteinhagen, R JBart-Pedersen, SBelleman, JBohl, TDamerau, HWall-Current-Monitor based Ghost and Satellite Bunch Detection in the CERN PS and the LHC AcceleratorsAccelerators and Storage RingsWhile most LHC detectors and instrumentation systems are optimised for a nominal bunch spacing of 25 ns, the LHC RF cavities themselves operate at the 10th harmonic of the maximum bunch frequency. Due to the beam production scheme and transfers in the injector chain, part of the nominally ‘empty’ RF buckets may contain particles, referred to as ghost or satellite bunches. These populations must be accurately quantified for high-precision experiments, luminosity calibration and control of parasitic particle encounters at the four LHC interaction points. This contribution summarises the wall-current-monitor based ghost and satellite bunch measurements in CERN’s PS and LHC accelerators. Instrumentation set-up, post-processing and achieved performance are discussed.CERN-ATS-2012-249oai:cds.cern.ch:14760752012-04-15
spellingShingle Accelerators and Storage Rings
Steinhagen, R J
Bart-Pedersen, S
Belleman, J
Bohl, T
Damerau, H
Wall-Current-Monitor based Ghost and Satellite Bunch Detection in the CERN PS and the LHC Accelerators
title Wall-Current-Monitor based Ghost and Satellite Bunch Detection in the CERN PS and the LHC Accelerators
title_full Wall-Current-Monitor based Ghost and Satellite Bunch Detection in the CERN PS and the LHC Accelerators
title_fullStr Wall-Current-Monitor based Ghost and Satellite Bunch Detection in the CERN PS and the LHC Accelerators
title_full_unstemmed Wall-Current-Monitor based Ghost and Satellite Bunch Detection in the CERN PS and the LHC Accelerators
title_short Wall-Current-Monitor based Ghost and Satellite Bunch Detection in the CERN PS and the LHC Accelerators
title_sort wall-current-monitor based ghost and satellite bunch detection in the cern ps and the lhc accelerators
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/1476075
work_keys_str_mv AT steinhagenrj wallcurrentmonitorbasedghostandsatellitebunchdetectioninthecernpsandthelhcaccelerators
AT bartpedersens wallcurrentmonitorbasedghostandsatellitebunchdetectioninthecernpsandthelhcaccelerators
AT bellemanj wallcurrentmonitorbasedghostandsatellitebunchdetectioninthecernpsandthelhcaccelerators
AT bohlt wallcurrentmonitorbasedghostandsatellitebunchdetectioninthecernpsandthelhcaccelerators
AT damerauh wallcurrentmonitorbasedghostandsatellitebunchdetectioninthecernpsandthelhcaccelerators

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