03/06/00 Update

PEP-II Update March 6, 2000

During the accelerator machine development day last week, the LER wiggler was turned off as a test. Turning off the wiggler lowers the LER horizontal emittance from 49 to 23 nm. The vertical emittance is similarly reduced.  The resulting overlap beam sizes at the interaction region (cap-sigmas) at low currents were reduced from 7 to 6.1 microns vertically and from 220 to about 205 microns horizontally. A decision was made to collide with these conditions.

On Sunday March 5, 2000, a new luminosity record of 1.694E33/cm**2/s  was achieved with 703 mA of electrons on 854 mA of positrons in 829 bunches.  Integrated luminosities of 33.4 /pb in one eight hour shift and 86.9 /pb in three consecutive shifts have been delivered by PEP-II.

John Seeman for the PEP-II Staff  3/6/00

Suggestions to: John Seeman

[PEP-II Commissioning Updates] [PEP-II Home Page] [BABAR Detector Home Page] [SLAC Home Page]

Page owner: achan