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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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