Self-amplified spontaneous emission for a single pass free-electron laser

Physical Review Special Topics - Accelerators and Beams (Impact Factor: 1.52). 06/2011; 14:060712. DOI: 10.1103/PhysRevSTAB.14.060712

ABSTRACT 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 measure-ments of energy, spectra, and exponential gain. Experimental results are compared with simulations from several numerical codes.

1 Follower
  • [Show abstract] [Hide abstract]
    ABSTRACT: We present a procedure based on the combined use of analytical and numerical tools, useful for understanding the relative interplay between the various components of a free electron laser (FEL) self-amplified spontaneous emission (SASE) device. We take as reference case the Sorgente Pulsata Auto-amplificata di Radiazione Coerente (SPARC) experiment to analyze how electron beam transverse matching conditions affect the lasing conditions itself and discuss the possibility of implementing new configurations. In particular we show that the procedure can be extended to account for the effect of an on line inserted cavity, with the role of inducing a transverse longitudinal correlation allowing a transfer of the longitudinal and transverse emittance. We discuss the associated benefit on the FEL operation, with particular reference to the nonlinear harmonic generation. The possibility of completing the tool with regards to the beam degradation effects due to CSR is briefly accounted for.
    IEEE Journal of Quantum Electronics 03/2013; 49(3):267-273. DOI:10.1109/JQE.2013.2238889 · 2.11 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We review the theory of two color high gain free-electron laser emission, derive the integral equation characterizing the evolution of the optical intensities, and provide a description of the relevant dynamics. The characteristic feature of this regime is the existence of a mutual bunching, whose origin and role are discussed.
    Physical Review Letters 12/2013; 111(26):264801. DOI:10.1103/PhysRevLett.111.264801 · 7.73 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Harmonic generation becomes increasingly important as x-ray free-electron lasers push to shorter wavelengths. Recent studies have pointed to the possibility of enhancing harmonic generation by detuning the fundamental. In x-ray free-electron lasers, the wiggler line is composed of multiple wiggler segments with magnetic quadrupoles in the gaps to provide for increased focusing. In this paper, we study the effect on harmonic generation in simulation by (1) varying the gap lengths between the wiggler segments and (2) varying the electron beam β function. In studying the harmonic we find enhanced harmonic generation is periodic in the gap length and peaks are found as the wiggler separation varies by λ /3 (where λ is the fundamental wavelength), which corresponds to a phase shift of 2π/3. As a consequence, enhanced harmonic generation is found both when the fundamental emission is strong by the nonlinear harmonic generation mechanism and by linear harmonic generation when the fundamental is detuned.
    Physical Review Special Topics - Accelerators and Beams 12/2013; 17(1). DOI:10.1103/PhysRevSTAB.17.010702 · 1.52 Impact Factor


Available from
May 15, 2014