Time-domain measurement of a self-amplified spontaneous emission free-electron laser with an energy-chirped electron beam and undulator tapering
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- Particle Beam Physics Laboratory, Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, California 90095 (United States)
- ENEA C.R. Frascati, Via E. Fermi, 45 00044 Frascati, RM (Italy)
- INFN-LNF, Via E. Fermi, 40 00044 Frascati, RM (Italy)
- INFN-Roma Tor Vergata and University of Rome Tor Vergata, Via della Ricerca Scientifica, 1-00133 Rome (Italy)
- Universita degli Studi di Roma La Sapienza, P.le Aldo Moro 5, 00185 Roma (Italy)
- Universita degli Studi di Milano and INFN-MI, Via Celoria, 16 20133 Milano (Italy)
We report, with an unequivocal time-domain measurement, that an appropriately chosen undulator taper can compensate for an electron beam longitudinal energy-chirp in a free-electron laser amplifier, leading to the generation of single-spike radiation close to the Fourier limit. The measurements were taken using the frequency-resolved optical gating technique by employing an advanced transient-grating diagnostic geometry. The reconstructed longitudinal radiation characteristics are compared in detail to prediction from time-dependent three-dimensional simulations.
- OSTI ID:
- 22080468
- Journal Information:
- Applied Physics Letters, Vol. 101, Issue 13; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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