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Seeman, J.; Browne, Michael C.; Cai, Y.; Colocho, W.; Decker, F.J.; Donald, M.; Ecklund, S.; Erickson, Roger A.; Fisher, A.; Fox, J.; Heifets, S.; Iverson, R.; Kozanecki, Witold; Krejcik, Patrick; Kulikov, A.; Novokhatski, Alexander; Schuh, P.; Schwarz, H.; Stanek, M.; Sullivan, M.; Teytelman, Dmitry; SLAC; Frascati; LBL, Berkeley
Stanford Linear Accelerator Center (United States). Funding organisation: US Department of Energy (United States)2008
Stanford Linear Accelerator Center (United States). Funding organisation: US Department of Energy (United States)2008
AbstractAbstract
[en] PEP-II is an e+e- B-Factory Collider located at SLAC operating at the Upsilon 4S resonance. PEP-II has delivered, over the past five years, an integrated luminosity to the BaBar detector of over 131 fb-1 and has reached a luminosity of 6.11 x 1036/cm2/s. Steady progress is being made in reaching higher luminosity. The goal over the next several years is to reach a luminosity of at least 2 x 1034/cm2/s. The accelerator physics issues being addressed in PEP-II to reach this goal include the electron cloud instability, beam-beam effects, parasitic beam-beam effects, high RF beam loading, shorter bunches, lower beta y*, interaction region operation, and coupling control. A view of the PEP-II tunnel is shown in Figure 1. The present parameters of the PEP-II B-Factory are shown in Table 1 compared to the design. The present peak luminosity is 204% of design and the best integrated luminosity per month is 7.4 fb-1 that is 225% of design. The best luminosity per month is shown in Figure 2. The integrated luminosity over a month is shown in Figure 3 and the total integrated luminosity in shown in Figure 4. The progress in luminosity has come from correcting the orbits, adding specific orbit bumps to correct coupling and dispersion issues, lowering the beta y* in the LER, and moving the fractional horizontal tunes in both rings to just above the half integer (<0.52)
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8 Apr 2008; 3 p; Particle Accelerator Conference (PAC 03); Portland, OR (United States); 12-16 May 2003; AC02-76SF00515; Available from http://www.slac.stanford.edu/cgi-wrap/getdoc/slac-pub-13200.pdf; PURL: https://www.osti.gov/servlets/purl/927078-AiYgLa/; Conf.Proc.C030512:2297,2003
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