Title :
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
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;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.795688
