[SLAC] [SLAC Pubs and Reports]
SLAC-PUB-7835
Instrumentation and Diagnostics for PEP-II
Abstract
PEP-II is a 2.2-km-circumference collider with a 2.1-A, 3.1-GeV
positron ring (the Low-Energy Ring) 1 m above a 1-A, 9-GeV electron
ring (the High-Energy Ring); both rings are designed to allow an
upgrade to 3 A. Since June 1997, we have had three runs totaling 14
weeks to commission the full HER, reaching a current of 0.75
A. Positrons were transported through the first 90 m of the LER in
January 1998, with full-ring tests planned for the summer. This
workshop provides a timely opportunity to review the design of the
beam diagnostics and their performance, with an emphasis on what
works, what doesn't, and what we're doing to improve it. This paper
discusses: the synchrotron-light monitor, including both transverse
imaging onto a CCD camera and longitudinal measurements with a streak
camera; beam-position monitors, with processors capable of 1024-turn
records, FFTs, and phase-advance measurements; tune measurements with
a spectrum analyzer, including software for peak tracking;
measurements of both the total ring current and the charge in each
bucket, for real-time control of the fill; and beam-loss monitors
using small Cherenkov detectors for measuring losses from both stored
and injected beam.
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