| Paper |
Title |
Page |
| MOPPH048 |
The ARC-EN-CIEL FEL Proposal
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146 |
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- C. Bruni, O. V. Chubar, J.-M. Filhol, A. Loulergue, L. Nahon
SOLEIL, Gif-sur-Yvette
- P. Bosland, B. Carré, M.-E. Couprie, G. Devanz, D. Garzella, O. Gobert, Ph. Hollander, M. Jablonka, M. Labat, G. Lambert, M. Luong, F. Meot, P. Monot, A. Mosnier, G. Petite, O. Tcherbakoff, B. Visentin
CEA, Gif-sur-Yvette
- J.-R. Marquès
LULI, Palaiseaux
- H. Monard, J.-M. Ortega
CLIO/ELYSE/LCP, Orsay
- A. Rousse
LOA, Palaiseau
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ARC-EN-CIEL (Accelerator-Radiation for Enhanced Coherent Intense Extended Light aims at providing the user community with coherent femtosecond light pulses covering from UV to soft X ray in France. Phase 1 aims at exploiting the different sources of seeding, in particular Harmonic generation in Gas (HHG), to improve the longitudinal coherence and shortening the output radiation wavelength in a rather compact device. Phase 2 uses a CW 10 KHz 1 GeV superconducting linear accelerator delivering high charge, subpicosecond, low emittance electron bunches for HHG seeded High Gain harmonic Generation extending to 1 nm. In phase 3, fs undulator sources in the IR, VUV and X ray and a FEL oscillator in the 10 nm range will be implemented on ERL beam loops for beam current or energy enhancement. Electron plasma acceleration and fs hard X ray produced by Thomson Scattering are also foreseen. Preliminary studies are carried out in the frame of the EUROFEL collaboration, concerning the electro-optical measurement at ELYSE, carbon nanotubes, synchronisation and beam shaping for the gun, seeding with high harmonics produced in gas on SPARC and compensation of microphonics for the Linac.
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| THPPH001 |
Temporal Analysis and Shape Control of UV High Energy Laser Pulses for Photoinjectors
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552 |
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- D. Garzella, O. Gobert, Ph. Hollander, F. Lepetit, M. Perdrix
CEA, Gif-sur-Yvette
- T. Oksenhendler
FASTLITE, Palaiseau
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In order to obtain high brightness electron bunches and generating high power, subpicosecond XUV radiation by SASE and/or seeded FEL, the laser pulses impinging onto the photocathode require special characteristics not only in terms of wavelength and delivered energy per pulse. Temporally and spatially shaped UV pulses are needed for preventing non linear space charge forces and then minimizing the electron emittance. In the EUROFEL program framework, our goal is to obtain few picosecond, 100 μJ laser pulses in the UV (266 nm) with a totally controlled and characterized longitudinal shape varying from the "beer can" profile to the "rotation ellipsoid" one. In this paper, a survey of the studies conceived for obtaining the desired goal on the KHz, Chirped Pulse Amplification (CPA)-based Ti:Sa laser system PLFA at CEA-Saclay, is shown. These latter deal with the amplitude and phase control of the stretched laser pulses issued from an amplifier before entering the compressor and the tripling unit. The work presents the theoretical background and stresses on the existing technological bottlenecks before showing various proposed experimental set-ups and preliminary promising results.
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