Recent beam-beam experience with multiple high current bunches in PEP-II
- 7 February 2000
- report
- Published by Office of Scientific and Technical Information (OSTI)
Abstract
Operation with colliding beams at PEP-II has progressed remarkably well with over half the design specific luminosity and 5.2 x 10{sup 32}cm{sup {minus}2}s{sup {minus}1} in multiple bunches demonstrated during the last commissioning period before installation of the BABAR detector. Further luminosity increases are anticipated as the vertical beam size is reduced and beam currents are raised towards design values. At high currents interesting multibunch dynamics, which depend strongly on current distribution, have been observed during single-beam commissioning studies. Transverse beam instabilities nominally controlled using bunch-by-bunch feedback were observed to be significantly suppressed, in the absence of feedback, with beams in collision.Keywords
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