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Longitudinal Bunch Profile Measurements

Coherent Smith-Purcell (SP) radiation offers the possibility of determining, in a nondestructive way, the time profile of very short electron bunches like those produced by Laser and Plasma Wakefield Acceleration (PWA). The technique is compact, relatively inexpensive and can operate in single-shot mode. It has already been demonstrated over a broad range of beam energies and with bunches in the 1-3ps range.
Studies at FACET will demonstrate the validity of the technique with bunch lengths that are about 2 orders of magnitude shorter (~50fs FWHM). If successful, this experiment will open the possibility to extend the method down to ~5fs.

SLAC SLAC National Accelerator Laboratory, Menlo Park, CA
Operated by Stanford University for the U.S. Dept. of Energy