Operational procedures to obtain high beam-beam tune shifts in LEP pretzel operation

During the running period 1994 the luminosity of LEP has been improved without colliding higher bunch currents. This paper describes the main procedures used by the operations group for luminosity optimization. Separator scans in the vertical plane and orbit interpolations in the horizontal plane ar...

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Detalles Bibliográficos
Autores principales: Bailey, R, Collier, Paul, Bohl, T, Burkhardt, H, Cornelis, Karel, de Rijk, G, Faugier, A, Jonker, M, Lamont, M, Roy, G, Schmickler, Hermann, Wenninger, J
Lenguaje:eng
Publicado: 1995
Materias:
Accelerators and Storage Rings
Acceso en línea:http://cds.cern.ch/record/283578
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author Bailey, R
Collier, Paul
Bohl, T
Burkhardt, H
Cornelis, Karel
de Rijk, G
Faugier, A
Jonker, M
Lamont, M
Roy, G
Schmickler, Hermann
Wenninger, J
author_facet Bailey, R
Collier, Paul
Bohl, T
Burkhardt, H
Cornelis, Karel
de Rijk, G
Faugier, A
Jonker, M
Lamont, M
Roy, G
Schmickler, Hermann
Wenninger, J
author_sort Bailey, R
collection CERN
description During the running period 1994 the luminosity of LEP has been improved without colliding higher bunch currents. This paper describes the main procedures used by the operations group for luminosity optimization. Separator scans in the vertical plane and orbit interpolations in the horizontal plane are used to adjust settings for electrostatic separators in order to ensure head-on collisions. The closed orbit is corrected towards a reference orbit (called "golden" orbit) which has been found empirically to produce good luminosity. The settings of the skew quadrupoles for coupling compensation is obtained by measuring the closest tune approach of the horizontal and vertical betatron tunes.
id cern-283578
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1995
record_format invenio
spelling cern-2835782023-05-05T12:57:18Zhttp://cds.cern.ch/record/283578engBailey, RCollier, PaulBohl, TBurkhardt, HCornelis, Karelde Rijk, GFaugier, AJonker, MLamont, MRoy, GSchmickler, HermannWenninger, JOperational procedures to obtain high beam-beam tune shifts in LEP pretzel operationAccelerators and Storage RingsDuring the running period 1994 the luminosity of LEP has been improved without colliding higher bunch currents. This paper describes the main procedures used by the operations group for luminosity optimization. Separator scans in the vertical plane and orbit interpolations in the horizontal plane are used to adjust settings for electrostatic separators in order to ensure head-on collisions. The closed orbit is corrected towards a reference orbit (called "golden" orbit) which has been found empirically to produce good luminosity. The settings of the skew quadrupoles for coupling compensation is obtained by measuring the closest tune approach of the horizontal and vertical betatron tunes.CERN-SL-95-49-OPoai:cds.cern.ch:2835781995-06-14
spellingShingle Accelerators and Storage Rings
Bailey, R
Collier, Paul
Bohl, T
Burkhardt, H
Cornelis, Karel
de Rijk, G
Faugier, A
Jonker, M
Lamont, M
Roy, G
Schmickler, Hermann
Wenninger, J
Operational procedures to obtain high beam-beam tune shifts in LEP pretzel operation
title Operational procedures to obtain high beam-beam tune shifts in LEP pretzel operation
title_full Operational procedures to obtain high beam-beam tune shifts in LEP pretzel operation
title_fullStr Operational procedures to obtain high beam-beam tune shifts in LEP pretzel operation
title_full_unstemmed Operational procedures to obtain high beam-beam tune shifts in LEP pretzel operation
title_short Operational procedures to obtain high beam-beam tune shifts in LEP pretzel operation
title_sort operational procedures to obtain high beam-beam tune shifts in lep pretzel operation
topic Accelerators and Storage Rings
url http://cds.cern.ch/record/283578
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