Beam-beam collisions at the PEP-II B factory

20 January 2003

conference paper
Published by Institute of Electrical and Electronics Engineers (IEEE)

Vol. 1, 296-298
https://doi.org/10.1109/pac.1999.795688

Abstract

We describe first beam collisions at the PEP-II B Factory, a collaboration of SLAC, LBNL, and LLNL. The beams are brought close to each other in the transverse (x,y) and longitudinal (timing) directions through the use of two shared beam position monitors located 0.72 m from either side of the interaction point (IP). Transverse beam-beam deflection scans and the use of a zero-angle luminosity detector allow us to center the collisions. Beam collisions were also seen by exciting one beam at its tune frequency and observing a response in the other beam at the same frequency. Shifts in betatron tunes have also been measured. To date, the peak measured luminosity attained is 5.2/spl plusmn/1/spl times/10/sup 32/ cm/sup -2/ s/sup -1/ with 786 bunches in each beam and with beam currents of 354 mA for the high-energy beam (HEB) and 680 mA for the low-energy beam (LEB).

Keywords

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