Status Report on PEP-II Performance
| Author | : |
| Publisher | : |
| Total Pages | : 5 |
| Release | : 2002 |
| Genre | : |
| ISBN | : |
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PEP-II [1-9] is an ee− collider with asymmetric energies (3.1 and 9 GeV, respectively) in a 2200 m tunnel at the Stanford Linear Accelerator Center. The collider produces B mesons to study a particle physics effect called CP violation as well as other physics topics. PEP-II was completed in 1998 with the first luminosity generated in July of that year. The installation of the BaBar Detector was finished in May 1999. The overall layout of PEP-II is shown in Figure 1 and the interaction region of PEP-II in Figure 2. The accelerator parameters and achievements of the High Energy Ring (HER) are listed in Table 1 and those for the Low Energy Ring (LER) in Table 2. The two beams collide at a single point in the IR2 hall where the BaBar detector is located. Beam parameters at the best luminosity are shown in Table 3 and PEP-II milestones in Table 4. In August 1999 PEP-II passed the world's record for luminosity which was 8.1 x 1032/cm2/s. The present luminosity in PEP-II is 2.15 x 1033/cm2/s which is 72% of the design. In June 2000 PEP-II delivered an integrated luminosity of 150 pb−1 in one day, which is above the design integrated luminosity per day of 135 pb−1. Over the past year PEP-II has delivered over 12 fb−1 to BaBar. BaBar has logged over 11 pb−1. The present plan is collide until the end of October 2000 followed by a three month installation period.
