[SLAC] [SLAC Pubs and Reports]
SLAC-PUB-7917
Transverse Wakefield Effect Measurement Via Model-Independent Analysis
Abstract
Transverse wakefield effects due to structure misalignments can be an
important source of emittance degradation in a linear collider. Though
important, it is difficult to measure local wakefield effects and
identify the sources. Recently, we have developed a novel method for
analyzing the beam dynamics in an accelerator based on BPM readings,
that is independent of any machine models. This method relies on,
instead, statistically analyzing an ensemble of readings from a large
number of BPMs and for a large number of pulses. In addition,
pulse-by-pulse information of beam (and machine) parameters are
used. By taking advantage of the spatial correlation and temporal
structure of all these signals, such analysis allows observation of
beam dynamics at a level well below the single BPM resolution as well
as studies of subtle beam dynamics effects. Using this method, which
is quick and non-invasive, we are able to measure the transverse
wakefield effects due to structure misalignments in the SLC linac.
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