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

Author

Bailey, R. ; Collier, P. ; Bohl, T. ; Burkhardt, H. ; Cornelis, K. ; de Rijk, G. ; Faugier, A. ; Jonker, M. ; Lamont, M. ; Roy, G. ; Schmickler, H. ; Wenninger, J.

Author_Institution

CERN, Geneva, Switzerland

Volume

1

fYear

1995

fDate

1-5 May 1995

Firstpage

548

Abstract

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

Keywords

beam handling techniques; electron accelerators; particle beam dynamics; storage rings; synchrotrons; LEP pretzel operation; closed orbit; colliding higher bunch currents; coupling compensation; electrostatic separators; golden orbit; head-on collisions; high beam-beam tune shifts; luminosity; luminosity optimization; orbit interpolations; reference orbit; separator scans; skew quadrupoles; Electrostatic measurements; Extraterrestrial measurements; Interpolation; Optical coupling; Particle beams; Particle separators; Radiation detectors;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1995., Proceedings of the 1995

Conference_Location

Dallas, TX

Print_ISBN

0-7803-2934-1

Type

conf

DOI

10.1109/PAC.1995.504715

Filename

504715