Beam-beam collisions at the PEP-II B factory

Author

Sullivan, M. ; Cai, Y. ; Donald, M. ; Ecklund, S. ; Fieguth, T. ; Field, C. ; Fisher, A.S. ; Henderson, L. ; Himel, T. ; Krejcik, P. ; Mazaheri, G. ; Minty, M. ; Reichel, I. ; Seeman, J. ; Wienands, U. ; Corlett, J. ; Zisman, M. ; Kozanecki, W. ; Pacidi,

Author_Institution

Linear Accel. Center, Stanford Univ., CA, USA

Volume

1

fYear

1999

fDate

1999

Firstpage

296

Abstract

We describe first beam collisions at the PEP-II B Factory, a collaboration of SLAC, LBNL, and LLNL. The beams are brought close to each other in the transverse (x,y) and longitudinal (timing) directions through the use of two shared beam position monitors located 0.72 m from either side of the interaction point (IP). Transverse beam-beam deflection scans and the use of a zero-angle luminosity detector allow us to center the collisions. Beam collisions were also seen by exciting one beam at its tune frequency and observing a response in the other beam at the same frequency. Shifts in betatron tunes have also been measured. To date, the peak measured luminosity attained is 5.2±1×10³² cm^-2 s^-1 with 786 bunches in each beam and with beam currents of 354 mA for the high-energy beam (HEB) and 680 mA for the low-energy beam (LEB)

Keywords

colliding beam accelerators; electron accelerators; particle beam diagnostics; particle beam dynamics; storage rings; 354 mA; 680 mA; PEP-II B factory; beam position monitors; beam-beam collisions; betatron tunes; high-energy beam; interaction point; low-energy beam; transverse beam-beam deflection scans; zero-angle luminosity detector; Collaboration; Current measurement; Frequency; Laboratories; Linear accelerators; Magnets; Mesons; Particle beams; Production facilities; Timing;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1999. Proceedings of the 1999

Conference_Location

New York, NY

Print_ISBN

0-7803-5573-3

Type

conf

DOI

10.1109/PAC.1999.795688

Filename

795688