11/05/01 Update

PEP-II Update November 5, 2001

PEP-II has been delivering luminosity steadily to BaBar over the past month. The peak luminosity has consistently exceeded 4E33. There have been several technical problems that have been fixed with short repair days including BaBar DIRC and Drift Chamber electronics and two overheated vacuum components in PEP-II: a longitudinal feedback feed-through and an RF seal on a vacuum gate valve.

October has been the best month for PEP-II with a delivered luminosity of 6.35 fb-1. BaBar logged 6.04 fb-1. The BaBar background levels are in general good.

The near term future plans for PEP-II are to mainly deliver luminosity but to do a few shifts of machine development each week until the winter holiday break. PEP-II will shut off on December 23 and resume January 10. The present long run ends July 1, 2002. The machine studies will concentrate on lowering the betas at the collision point, moving the horizontal tunes to near the half integer, and raising the beam currents.  

Present PEP-II and BaBar performance records:

Peak luminosity:                   4.271x10**33/cm**2/s
Best shift:                              103 pb-1 delivered (101 pb-1 BaBar logged)
Best three shifts:                  291 pb-1 (278 pb-1 BaBar)
Best seven days:                  1.865 fb-1 (1.758 fb-1 BaBar)
Best month:                           6.35 fb-1 (6.04 fb-1 BaBar)
Total from May 1999:       60 fb-1 (54 fb-1 BaBar)

Suggestions to: John Seeman

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