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Published on: November 22, 2019
Observation of time-domain modulation of free-electron-laser pulses by multipeaked electron-energy spectrum
V Petrillo1, M P Anania, M Artioli
1INFN-Milano and Università di Milano, Via Celoria, 16 20133 Milano, Italy.
Abstract:
We present the experimental demonstration of a new scheme for the generation of ultrashort pulse trains based on free-electron-laser (FEL) emission from a multipeaked electron energy distribution. Two electron beamlets with energy difference larger than the FEL parameter ρ have been generated by illuminating the cathode with two ps-spaced laser pulses, followed by a rotation of the longitudinal phase space by velocity bunching in the linac. The resulting self-amplified spontaneous emission FEL radiation, measured through frequency-resolved optical gating diagnostics, reveals a double-peaked spectrum and a temporally modulated pulse structure.
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