08/10/99 Update
08/10/99 Update
Since mid-July work on the rings has continued to focus on reducing the beam sizes and on understanding the dependency of the luminosity on the various beam parameters (orbits, tunes, etc.). Performance of the solenoid correction on the machine was compared to the models and corrections implemented. A set of fairly reproducible configurations and reference orbits has been defined and we can revert to these quite efficiently.
This work has paid off in reaching a new peak luminosity of 6.15 10^32 cm^-2 s^-1. A combined beam size of 8.3 mum (vertical Sigma from Luminosity scans) has been measured, which is smaller than our best value before the BaBar roll-on. Max. specific Luminosity has been about 2.25 e30 (/bunch /A^2), again better than previously seen. Beam currents for highest Luminosity were roughly 850 on 330 mA in 830 bunches (2.5 m bunch spacing with a 5% ion-clearing gap). Beam life time has improved and Luminosity lifetimes in excess of two hours have been seen. As of Aug. 10 morning, BaBar has integrated 201 pb^-1.
We will continue to work towards reaching the design beam sizes and increasing the beam currents. We will also be focusing on reducing the number of beam aborts, in particular those due to background spikes, in order to increase our operational efficiency.
The continuing progress would be impossible to achieve without the PEP-Team's ongoing outstanding work and long hours spent in the control room and spent analysing the machine data. Thanks and again congratulations to everyone.
Uli Wienands, for the PEP Team.
Suggestions to: John Seeman
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