[SLAC] [SLAC Pubs and Reports]
SLAC-PUB-7894
Beam-Based Analysis of Day-Night Performance Variations at the SLC Linac
Abstract
Diurnal temperature variations in the linac gallery of the Stanford
Linear Collider (SLC) can affect the amplitude and phase of the rf
used to accelerate the beam. The SLC employs many techniques for
stabilization and compensation of these effects, but residual
uncorrected changes still affect the quality of the delivered
beam. This paper presents methods developed to monitor and investigate
these errors through the beam response. Variations resulting from
errors in the rf amplitude or phase can be distinguished by studying
six different beam observables: betatron phase advance, oscillation
amplitude growth, rms jitter along the linac, measurements of the beam
phase with respect to the rf, changes in the required injection phase,
and the global energy correction factor. By quantifying the beam
response, an uncorrected variation of 14 degree (S-band) during 28 degree F
temperature swings was found in the main rf drive line system between
the front and end of the linac.
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