Generation of short THz bunch trains in a RF photoinjector

Boscolo, M.; Ferrario, M.; Boscolo, I.; Castelli, F.; Cialdi, S.

doi:10.1016/j.nima.2007.04.129

Cited by 50 publications

(38 citation statements)

References 13 publications

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“…Downstream the photoinjector, the beam acquires an energy modulation because of the space charge effects and, if injected in a RF-compressor operating in the over-compression regime, the energy modulation can be transformed back into a density modulation. 51 The train parameters, bunch charge, length, and inter-distance, are completely controlled by the accelerator with no particle losses. As a train of sub-ps relativistic electron bunches crosses an aluminum screen, coherent THz radiation is generated and its spectrum results in a series of narrow pulses whose THz central frequency and bandwidth depend on the bunches interdistance and width.…”

Section: 51mentioning

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: 51mentioning

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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“…[15]. The generation of a train of microbunches by shaping the temporal profile associated to a photocathode drive laser in a photoemission electron source were explored via numerical simulations [16][17][18]. An alternative method using an interceptive mask located in a dispersive section, first proposed in Ref.…”

Section: Introductionmentioning

confidence: 99%

Generation of relativistic electron bunches with arbitrary current distribution via transverse-to-longitudinal phase space exchange

Piot

Sun

Power

et al. 2011

Phys. Rev. ST Accel. Beams

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We propose a general method for tailoring the current distribution of relativistic electron bunches. The technique relies on a recently proposed method to exchange the longitudinal phase space emittance with one of the transverse emittances. The method consists of transversely shaping the bunch and then converting its transverse profile into a current profile via a transverse-to-longitudinal phase-spaceexchange beam line. We show that it is possible to tailor the current profile to follow, in principle, any desired distributions. We demonstrate, via computer simulations, the application of the method to generate trains of microbunches with tunable spacing and linearly ramped current profiles. We also briefly explore potential applications of the technique.

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“…A double-peaked electron energy spectrum is obtained by the laser comb technique in the velocity bunching [36,37]. The electron beam, constituted by two short and balanced bunches, is extracted from the linac accelerating section near the maximum compression.…”

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confidence: 99%

Observation of Time-Domain Modulation of Free-Electron-Laser Pulses by Multipeaked Electron-Energy Spectrum

et al. 2013

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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 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. DOI: 10.1103/PhysRevLett.111.114802 PACS numbers: 41.60.Cr, 42.55.Àf, 42.65.Ky Radiation pulses with attosecond to femtosecond time scales represent a real possibility for a breakthrough in science and technology, permitting unprecedented insights into the ultrafast electron and nuclear dynamics [1][2][3]. The time-resolved study of electron rearrangements could lead to significant advances in the understanding of intermolecular processes, chemical bond breaking and formation, and the interaction of photoactivated molecules with their environment.Trains of ultrashort radiation pulses enable stroboscopic electron imaging [4] and the investigation of the response accompanying collective electron motion in nanomaterials [5]. They also find further applications in other technical fields, such as the enhancement of transmission or reflectivity in materials, resonant inelastic x-ray scattering, or the ab initio phasing of nanocrystals [6].Sequences of spikes have been synthesized by means of the high harmonic generation driven by lasers in gases [7] and regularly used in experiments [4,8], but are severely limited in efficiency approaching the keV range.Free-electron lasers (FELs) are capable of producing high brightness pulses in the x-ray spectral region [9][10][11][12]. The FEL, in the self-amplified spontaneous emission (SASE) mode of operation [13], generates radiation with limited temporal coherence [14], time duration of the order of the electron bunch length and structured in a chaotic succession of random peaks. The typical time scale of these radiation spikes is set by the FEL Pierce parameter [13]. Several techniques have been explored to increase longitudinal coherence, stability, and/or to shorten the FEL pulse time scale towards the attosecond domain. The amplification of one single SASE spike has been demonstrated by compressing the electron beam close or below the FEL coherence length [15,16], by using a chirped bunch energy combined with a matched undulator taper [17][18][19], or by spoiling the whole electron beam except a limited fraction [20,21], a technique that has also been implemented to produce double pulse two-color radiation for pump and probe experiments [22]. Short single or multiple pulses have also been produced in seeded or cascaded FELs [23][24][25][26][27], with increased coherence and shot to shot stability. More sophisticated seeding concept...

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Generation of short THz bunch trains in a RF photoinjector

Cited by 50 publications

References 13 publications

Characterization of the THz radiation source at the Frascati linear accelerator

Characterization of the THz radiation source at the Frascati linear accelerator

Generation of relativistic electron bunches with arbitrary current distribution via transverse-to-longitudinal phase space exchange

Observation of Time-Domain Modulation of Free-Electron-Laser Pulses by Multipeaked Electron-Energy Spectrum

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