CHARACTERIZATION OF PS-SPACED COMB BEAMS AT SPARC
2012
SPARC in Frascati is a high brightness photo-injector
used to explore advanced beam manipulation techniques.
Sub-picosecond, high brightness electron bunch trains (the
so called comb beam) can be generated illuminating the
cathode of a RF photoinjector with a laser pulse train and
via velocity bunching technique. In this paper different aspects
of the physics of this advanced beam manipulation
technique are discussed combining simulation and measurements.
Beam dynamics numerical macroparticle simulations
have been compared with the experimental results
for model validation; they allow to gain insights on the
beam evolution highlighting several aspects which can not
be measured. In particular, we focus on the train evolution
in the linac sections and in the dogleg line up to the THz
station and on the effective rms length of the single pulses
within the train when it becomes shorter than the resolution.
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