A LUMINOSITY OF 10 34 CM −2 S −1 IN THE PEP-II B-FACTORY*

Le résumé fourni par la source

PEP-II is an e+e- asymmetric B-Factory Collider located at SLAC operating at the Upsilon 4S resonance (3.1 GeV x 9 GeV). It has reached a luminosity of 1.09x1034/cm2/s and has delivered an integrated luminosity of 884 pb-1 in one day. PEP-II has delivered, over the past seven years, an integrated luminosity to the BaBar detector of over 375 fb-1. PEP-II operates in continuous injection mode for both beams boosting the integrated luminosity. The peak positron current has reached 2.995 A in 1722 bunches. The electron current has reached 1.78 A. The goal over the next several years is to reach a luminosity of 2.1x1034/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 βy* interaction region operation, and coupling control. Figure 1 shows the PEP-II tunnel. PARAMETERS The present parameters of PEP-II are shown in Table 1 compared to the design. The present peak luminosity is over 3.6 times the design and the best integrated luminosity per day is 0.884 fb-1, over 6.8 times the design. The highest luminosity in each month is shown in Figure 2, the integrated luminosity for each month since the startup of PEP-II is shown in Figure 3 and the integrated

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