PEP-II operations report

PEP-II is a two-ring asymmetric B factory operating at the ϒ(4S) resonance. It was constructed by a SLAC-LBNL-LLNL collaboration. The collider comprises two rings, a High-Energy Ring (HER) storing 9 GeV electrons, and a Low-Energy Ring (LER) storing 3.1 GeV positrons. Commissioning of the HER began in mid-1997 and commissioning of the LER began in mid-1998. First evidence for collisions was obtained on July 23, 1998. The BABAR detector was installed in early 1999, and commissioning with the detector commenced in May 1999. In the present run, which began in October 1999, the peak luminosity has reached 3.1×1033 cm−2 s−1 and the integrated luminosity delivered is 25 fb−1. In this paper we describe the startup experience and summarize the operational experience during fiscal year 2000 (from October 1999 through September 2000). Plans for luminosity upgrades are briefly described.