Self-amplified spontaneous emission for a single pass free-electron laser
2011
SPARC (acronym of ‘‘Sorgente Pulsata ed Amplificata di Radiazione Coerente’’, i.e. Pulsed and
Amplified Source of Coherent Radiation) is a single pass free-electron laser designed to obtain high gain
amplification at a radiation wavelength of 500 nm. Self-amplified spontaneous emission has been
observed driving the amplifier with the high-brightness beam of the SPARC linac. We report measurements
of energy, spectra, and exponential gain. Experimental results are compared with simulations from
several numerical codes.
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