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

Giannessi, L.; Alesini, D.; Antici, P.; Bacci, A.; Bellaveglia, M.; Boni, R.; Boscolo, M.; Briquez, F.; Castellano, M.; Catàni, L.; Chiadroni, E.; Cianchi, A.; Ciocci, F.; Clozza, A.; Couprie, M.E.; Cultrera, L.; Dattoli, G.; Franco, M.; Dipace, A.; Pirro, G. Di; Doria, A.; Drago, A.; Fawley, William M.; Ferrario, M.; Ficcadenti, L.; Filippetto, D.; Frassetto, Fabio; Freund, H.P.; Fusco, V.; Gallerano, Gian Piero; Gallo, A.; Gatti, G.; Ghigo, A.; Giovenale, E.; Marinelli, Agostino; Labat, M.; Marchetti, Barbara; Marcus, Gabriel; Marrelli, C.; Mattioli, M.; Migliorati, M.; Moreno, Marco P.; Mostacci, A.; Orlandi, Gian Luca; Pace, E.; Palumbo, L.; Petralia, A.; Petrarca, M.; Petrillo, V.; Poletto, Luca; Quattromini, M.; Rau, Julietta V.; Reiche, S.; Ronsivalle, C.; Rosenzweig, James; Rossi, A. R.; Albertini, V. Rossi; Sabia, E.; Serafini, L.; Serluca, M.; Spassovsky, I.; Spataro, B.; Surrenti, V.; Vaccarezza, C.; Vescovi, M.; Vicario, C.

doi:10.1103/physrevstab.14.060712

Cited by 61 publications

(39 citation statements)

References 24 publications

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“…THz, [31][32][33] Compton, etc., to novel schemes for generation of FEL radiation, [34][35][36][37] to plasma acceleration experiments. 38,39 In the following, we will focus on the activity concerning the generation, characterization and transport of both a high brightness single pulse electron beam and a multi-pulses train through the dogleg beamline down to the THz station, for the development of high peak power, both broadband and narrowband THz radiation, whose experimental layout is described in Sec.…”

Section: The Sparc-lab Test Facilitymentioning

confidence: 99%

Characterization of the THz radiation source at the Frascati linear accelerator

Chiadroni

Bellaveglia

Calvani

et al. 2013

Review of Scientific Instruments

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Material selection considerations for coaxial, ferrimagnetic-based nonlinear transmission lines J. Appl. Phys. 113, 064904 (2013) Graphene on boron nitride microwave transistors driven by graphene nanoribbon back-gates Appl. Phys. Lett. 102, 033505 (2013) Millimeter scale electrostatic mirror with sub-wavelength holes for terahertz wave scanning Appl. Phys. Lett. 102, 031111 (2013) Leaky and bound modes in terahertz metasurfaces made of transmission-line metamaterials J. Appl. Phys. 113, 033105 (2013) Additional information on Rev. Sci. Instrum. The linac driven coherent THz radiation source at the SPARC-LAB test facility is able to deliver broadband THz pulses with femtosecond shaping. In addition, high peak power, narrow spectral bandwidth THz radiation can be also generated, taking advantage of advanced electron beam manipulation techniques, able to generate an adjustable train of electron bunches with a sub-picosecond length and with sub-picosecond spacing. The paper reports on the manipulation, characterization, and transport of the electron beam in the bending line transporting the beam down to the THz station, where different coherent transition radiation spectra have been measured and studied with the aim to optimize the THz radiation performances.

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Section: The Sparc-lab Test Facilitymentioning

confidence: 99%

Characterization of the THz radiation source at the Frascati linear accelerator

Chiadroni

Bellaveglia

Calvani

et al. 2013

Review of Scientific Instruments

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“…MEDUSA has been extensively validated by comparison with amplifier experiments at Brookhaven National Laboratory [17,18], a high average power oscillator at Jefferson Laboratory [19], and the SPARC SASE (selfamplified spontaneous emission) experiment at ENEA Frascati [20].…”

Section: The Simulation Codementioning

confidence: 99%

Enhanced harmonic generation in x-ray free-electron lasers

Freund

Yampolsky

Marksteiner

2014

Phys. Rev. ST Accel. Beams

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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.

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“…The experiment was performed at the UV seeded FEL of the SPARC facility [25]. The six SPARC undulators (75 periods each, period length u ¼ 2:8 cm [26]) were configured to establish an HGHG FEL, with the first undulator tuned with the resonance at 400 nm, playing the role of modulator, and the other five tuned at 200 nm, as radiators (see Fig.…”

mentioning

confidence: 99%

“…The main output radiation diagnostic is an in-vacuum spectrometer [25] (normal incidence grating imaging the variable entrance slit on a UV grade CCD camera, Versarray, 1300B-Princeton Instruments), allowing simultaneous single shot measurements of the vertical and spectral distributions and of the absolute pulse energy [25].…”

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confidence: 99%

Superradiant Cascade in a Seeded Free-Electron Laser

Giannessi¹,

Bellaveglia

Chiadroni

et al. 2013

Phys. Rev. Lett.

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We report measurements demonstrating the concept of the free-electron laser (FEL) superradiant cascade. Radiation ( rad ¼ 200 nm) at the second harmonic of a short, intense seed laser pulse ( seed ¼ 400 nm) was generated by the cascaded FEL scheme at the transition between the modulator and radiator undulator sections. The superradiance of the ultrashort pulse is confirmed by detailed measurements of the resulting spectral structure, the intensity level of the produced harmonics, and the trend of the energy growth along the undulator. These results are compared to numerical particle simulations using the FEL code GENESIS 1.3 and show a satisfactory agreement. Fourth generation light sources open the way towards the exploration of molecular and atomic phenomena, yielding unprecedented benefits to a wide range of scientific disciplines [1][2][3][4][5][6]. Free-electron lasers (FELs), operating in self-amplified spontaneous emission (SASE) mode, have demonstrated the capability of reaching the subnanometer wavelength range at the femtosecond time scale [7,8]. The multielectron dynamics in atoms and molecules involved in chemical transformation processes evolves on a femtoto attosecond time domain. Thus, ultrashort pulses in the XUV spectral range are the potential tool to control and map the collective electronic and nuclei rearrangements. In a SASE FEL the generation of radiation is due to the passage of a relativistic electron beam through the periodic magnetic field of an undulator with maximum field amplitude B u and period u , inducing emission at a resonant2 (linear undulator) and its higher order harmonics, where is the Lorentz factor of the electrons and K ¼ eB u u =ð2m e cÞ the deflection parameter of the undulator. At the onset of saturation, the electrons emit coherently [9] over a characteristic frequency bandwidth Á!=! $ , where is the Pierce parameter [10,11]. Considering that typical values of the Pierce parameter range from 10 À3 to 10 À4 , the associated FWHM pulse length at the Fourier limit is ¼ 2 ffiffiffiffiffiffiffiffiffiffiffiffiffi ffi 2 lnð2Þ p L c =c, where L c ¼ rad =4 is known as cooperation length and, at rad ¼ 1 nm, assumes values in the range c $ 0:6-6 fs. When the electron bunch is longer than L c , several independent processes of SASE amplification can occur, leading to a pulse structure far from the Fourier limit and composed of a number of independent spikes [12]. A selective amplification of only one of these spikes has been demonstrated by shaping the electron beam phase space, in order to enable the field growth only in a limited portion of the bunch [13,14]. A single mode may also be generated by seeding the FEL amplifier with an external source. Seeding with a pulse shorter than c results in a spike of rms duration given by the cooperation length, at the onset of saturation when P sat % P beam (P beam is the electron beam power). Pulses shorter than the cooperation length may still be obtained at intensities higher than the saturation level, when the FEL emits in the superra...

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

Cited by 61 publications

References 24 publications

Characterization of the THz radiation source at the Frascati linear accelerator

Characterization of the THz radiation source at the Frascati linear accelerator

Enhanced harmonic generation in x-ray free-electron lasers

Superradiant Cascade in a Seeded Free-Electron Laser

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