A5053398931- Particle Accelerators and Free-Electron Lasers
- Advanced X-ray Imaging Techniques
- Laser-Plasma Interactions and Diagnostics
- Particle accelerators and beam dynamics
- Laser Design and Applications
- Gyrotron and Vacuum Electronics Research
- Superconducting Materials and Applications
- Laser-Matter Interactions and Applications
- Magnetic confinement fusion research
- Advanced Surface Polishing Techniques
- Advanced Electron Microscopy Techniques and Applications
- Terahertz technology and applications
- Laser-induced spectroscopy and plasma
- Electron and X-Ray Spectroscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Spectroscopy and Laser Applications
- Medical Imaging Techniques and Applications
- Photonic and Optical Devices
- Particle Detector Development and Performance
- Advanced X-ray and CT Imaging
- Atomic and Molecular Physics
- Mechanical and Optical Resonators
- Advanced Materials Characterization Techniques
- Pulsed Power Technology Applications
- Advancements in Photolithography Techniques
Synchrotron soleil
2016-2025
Université Toulouse III - Paul Sabatier
2021
Université Paris-Saclay
2017
Centre National de la Recherche Scientifique
2016
National Agency for New Technologies, Energy and Sustainable Economic Development
2009-2012
DSM (Netherlands)
2007-2011
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2011
Tecnologia Energia Ambiente Materiali (Italy)
2009-2010
CEA Paris-Saclay
2005-2009
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2005-2009
Abstract Plasma-based accelerators use the strong electromagnetic fields that can be supported by plasmas to accelerate charged particles high energies. Accelerating field structures in plasma generated powerful laser pulses or particle beams. This research has recently transitioned from involving a few small-scale efforts development of national and international networks scientists substantial investment large-scale infrastructure. In this New Journal Physics 2020 Plasma Accelerator...
Abstract Free-electron lasers generate high-brilliance coherent radiation at wavelengths spanning from the infrared to X-ray domains. The recent development of short-wavelength seeded free-electron now allows for unprecedented levels control on longitudinal coherence, opening new scientific avenues such as ultra-fast dynamics complex systems and nonlinear optics. Although those devices rely state-of-the-art large-scale accelerators, advancements laser-plasma which harness...
In this Letter we report the first experiments aimed at simultaneous demonstration of emittance compensation process and velocity bunching in a high brightness electron source, SPARC photoinjector INFN-LNF. While maximum compression ratio up to factor 14 has been observed, particular case interest 3, yielding slice current 120 A with less than 2 μm emittance, measured. This technique may be crucial achieving beams photoinjectors aiming optimized performance short wavelength single-pass free...
The injection of a seed in free-electron laser (FEL) amplifier reduces the saturation length and improves longitudinal coherence. A cascaded FEL, operating high-gain harmonic-generation regime, allows us to extend beneficial effects shorter wavelengths. We report on first operation laser, seeded with harmonics generated gas. third Ti:sapphire gas cell, has been amplified up-converted its second harmonic (${\ensuremath{\lambda}}_{\mathrm{rad}}=133\text{ }\text{ }\mathrm{nm}$) FEL...
Free-electron lasers (FELs) are a unique source of light, particularly in the x-ray domain. After success FELs based on conventional acceleration using radio-frequency cavities, an important challenge is development electron bunching accelerated by laser wakefield accelerator (LWFA). However, present LWFA bunch properties do not permit use directly for significant FEL amplification. It known that longitudinal decompression beams delivered state-of-the-art eases process. We propose here...
Abstract With gigaelectron-volts per centimetre energy gains and femtosecond electron beams, laser wakefield acceleration (LWFA) is a promising candidate for applications, such as ultrafast diffraction, multistaged colliders radiation sources (betatron, compton, undulator, free laser). However, some of these the beam performance, example, spread, divergence shot-to-shot fluctuations, need drastic improvement. Here, we show that, using dedicated transport line, can mitigate initial...
SPARC (acronym of ``Sorgente Pulsata ed Amplificata di Radiazione Coerente'', i.e. Pulsed and Amplified Source Coherent Radiation) is a single pass free-electron laser designed to obtain high gain amplification at radiation wavelength 500 nm. Self-amplified spontaneous emission has been observed driving the amplifier with high-brightness beam linac. We report measurements energy, spectra, exponential gain. Experimental results are compared simulations from several numerical codes.
We report the first experimental implementation of a method based on simultaneous use an energy chirp in electron beam and tapered undulator, for generation ultrashort pulses self-amplified spontaneous emission mode free-electron laser (SASE FEL). The experiment, performed at SPARC FEL test facility, demonstrates possibility compensating nominally detrimental effect by proper taper undulator gaps. An increase more than 1 order magnitude pulse is observed comparison to untapered case,...
The recent advances in developing compact laser plasma accelerators that deliver high quality electron beams a more reliable way offer the possibility to consider their use designing free (FEL). Because of particularity these (especially concerning divergence and energy spread), specific beam handling is proposed order achieve FEL amplification.
Abstract Emission of light by a single electron moving on curved trajectory (synchrotron radiation) is one the most well-known fundamental radiation phenomena. However experimental situations are more complex as they involve many electrons, each being exposed to its neighbors. This interaction has dramatic consequences, spectacular spontaneous formation spatial structures inside electrons bunches. effect actively studied it represents limitations in accelerators and at same time source...
The laser–plasma accelerator (LPA) presently provides electron beams with a typical current of few kA, bunch length fs, energy in the hundred MeV to several GeV range, divergence typically 1 mrad, an spread order 1%, and normalized emittance π.mm.mrad. One first applications could be use these for production radiation: undulator emission has been observed but rather large (1%) (1 mrad) prevent straightforward free-electron laser (FEL) amplification. An adequate beam manipulation through...
We report measurements demonstrating the concept of free-electron laser (FEL) superradiant cascade. Radiation (${\ensuremath{\lambda}}_{\mathrm{rad}}=200\text{ }\text{ }\mathrm{nm}$) at second harmonic a short, intense seed pulse (${\ensuremath{\lambda}}_{\mathrm{seed}}=400\text{ was generated by cascaded FEL scheme transition between modulator and radiator undulator sections. The superradiance ultrashort is confirmed detailed resulting spectral structure, intensity level produced harmonics,...
ThomX is a new generation Compact Compton Source. It currently commissioned by and at the IJCLab (Laboratoire de physique des 2 infinis - Irène Joliot-Curie (UMR9012)) Orsay. The first beam expected begining of 2021. aim to demonstrate characteristics an intense (lab-size) X-ray source based on Scattering. performances are mostly driven laser optical system which above state art stored power. Proof principle various techniques will be performed thanks versatile beamline. Firstly, this...
The development of red-shifted free electron lasers (FELs), based on strongly chirped beams, emerged a few years ago. Here we present thorough study the tunability seeded FEL. An analytical model is introduced to describe complex FEL resonance condition and its consequence for emission wavelength. This then benchmarked with experimental data from COXINEL (COherence Xray source INferred Electrons accelerated by Laser) beamline driven laser plasma accelerator at Helmholtz-Zentrum...
Free electron lasers (FELs) are advanced light sources delivering pulses with unprecedented intensity down to the hard x-ray range. Redshifted FEL represents a new scheme exploiting strongly chirped beams emit tunable coherent radiation at wavelengths longer than FEL's resonant condition. While theoretical studies and proposals for this rapidly advancing, experimental evidences so far very limited. Here, we report on nature of spatiospectral properties redshifted FEL, presenting analytical...
Higher order harmonic generation in a free-electron laser amplifier operating the superradiant regime [R. H. Dicke, Phys. Rev. 93, 99 (1954).] has been observed. Superradiance induced by seeding single-pass with second of Ti:sapphire laser, generated β-Barium borate crystal, at seed intensities comparable to saturation intensity. Pulse energy and spectral distributions harmonics up 11th have measured compared simulations.Received 5 January...
We have used coherent Smith-Purcell radiation (cSPr) in order to determine the temporal profile of sub-ps long electron bunches at Facility for Advanced Accelerator Experimental Tests, SLAC. The measurements reported here were carried out June 2012 and April 2013. rms values bunch length varied between 356 604 fs, depending on accelerator settings. resolution system was limited by range detectable wavelengths which was, turn, determined choice grating periods these experiments achievable...
The intense Coherent Synchrotron Radiation emitted in the Terahertz range by relativistic electron bunches circulating a storage ring is an attractive source for spectroscopy. Its stability related to bunch dynamics, and can exhibit bursting behavior resulting from irregular presence of micro-structures bunch. We evidence here existence two thresholds spatio-temporal associated with different levels signal fluctuations, increasing number electrons. first threshold indicates drifting profile,...
Abstract Owing to their ultra-high accelerating gradients, combined with injection inside micrometer-scale wakefield buckets, plasma-based accelerators hold great potential drive a new generation of free-electron lasers (FELs). Indeed, the first demonstration plasma-driven FEL gain was reported recently, representing major milestone for field. Several groups around world are pursuing these novel light sources, methodology varying in use driver (laser-driven or beam-driven), plasma structure,...
We investigate a fundamental limitation occurring in vacuum ultraviolet and extreme seeded free electron lasers (FELs). For given beam undulator configuration, an increase of the FEL output energy at saturation can be obtained via seed pulse duration. put evidence complex spatiotemporal deformation amplified pulse, leading ultimately to splitting effect. Numerical studies Colson--Bonifacio equations reveal that slippage length laser wings are core ingredients dynamics.