[SLAC] [SLAC Pubs and Reports]
SLAC-PUB-7898
Bunch-Length and Beam-Timing Monitors in the SLC Final Focus
Abstract
During the 1997/98 luminosity run of the Stanford Linear Collider
(SLC), two novel RF-based detectors were brought into operation, in
order to monitor the interaction-point (IP) bunch lengths and
fluctuations in the relative arrival time of the two colliding
beams. Both bunch length and timing can strongly affect the SLC
luminosity and had not been monitored in previous years. The two new
detectors utilize a broad-band microwave signal, which is excited by
the beam through a ceramic gap in the final-focus beam pipe and
transported outside of the beamline vault by a 160-ft long X-Band
waveguide. We describe the estimated luminosity reduction due to
bunch-length drift and IP timing fluctuation, the monitor layout, the
expected responses and signal levels, calibration measurements, and
beam observations.
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