Feedback Systems for PEP-II
Feedback systems have been commissioned for the PEP-II B factory to control orbit drifts from thermal and other transients, and to optimize the transverse overlap of the stored beams at the interaction point. BPM-based feedback loops correct the orbit at several points around both the low- and the high-energy ring. The beams are kept centered in collision by an optimization feedback that dithers the transverse position of one of the beams at the interaction point to maximize the readout of a radiative-Bhabha luminosity monitor. Luminosity-optimization dithering is also used to stabilize the relative vertical angle of the two beams, and to keep the positron beam aimed at the luminosity monitor. The current implementation acts on the beams at a rate of up to 2 Hz, and can compensate for changes within 10 seconds or less. This paper outlines the implementation of the feedback loops, and highlights the main improvements inspired by the first year of physics running at PEP-II.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 763801
- Report Number(s):
- SLAC-PUB-8480; TRN: US0004837
- Resource Relation:
- Other Information: PBD: 23 Jun 2000
- Country of Publication:
- United States
- Language:
- English
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