Author :
Cai, Y. ; Clendenin, J. ; Decker, F.J. ; Donald, M. ; Ecklund, S. ; Erickson, R. ; Fisher, A. ; Heifets, S. ; Holtzapple, R. ; Iverson, R. ; Krejcik, P. ; Kulikov, A. ; Nelson, J. ; Novokhatski, A. ; Reichel, I. ; Seeman, J.T. ; Stanek, M. ; Sullivan, M.
Author_Institution :
SLAC Collaboration, Stanford Univ., CA, USA
Abstract :
The PEP-II e+e- collider has been operating for two years with the BaBar detector at the energy of the Upsilon 4S resonance. The peak luminosity has reached 3.3 × 1033/cm2/s with 693 bunches with a positron current of 1.5 A and an electron current of 0.8 A. PEP-II has delivered in excess of 38 fb-1 of data to BaBar. The beam-beam tune shift limits are approaching 0.05-0.07 horizontally and 0.03-0.05 vertically. The electron cloud instability enlarges the positron beam size at high currents but is reduced by a solenoidal field on the vacuum chambers. The beam currents in PEP-II are being raised to increase the number of bunches and the luminosity. Over the next few years the luminosity goal for PEP-II is 1034/cm2/s
Keywords :
colliding beam accelerators; electron accelerators; particle beam diagnostics; storage rings; PEP-II B-factory; beam current; beam-beam tune shift; electron cloud instability; luminosity; Clouds; Detectors; Electron beams; Linear accelerators; Linear particle accelerator; Positrons; Radio frequency; Resonance; Synchrotrons; Voltage;
