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WEOCNO04 |
The Echo Scheme: An Efficient Alternative to Slicing on Storage Rings | |
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Echo-enabled harmonic generation was proposed in Free Electron Lasers [1] in order to enhance dramatically the FEL radiation on very high harmonic orders. Two laser-electron interactions that modulate the longitudinal charge distribution at a harmonic number of the laser wavelength are required, before FEL radiation is produced in a last radiator. The scheme has been applied to a storage ring [2], in order to produce femtosecond pulses of soft x-ray coherent undulator radiation. The output photon flux is expected to be several orders of magnitude higher than in the case of the conventional slicing scheme. Analytical as well as numerical simulations are presented in the case of SOLEIL storage ring.
[1] G. Stupakov, PRL 102, 074801 (2009). [2] C. Evain et al., New Journal of Physics 14, 023003 (2012). |
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Slides WEOCNO04 [2.067 MB] | |
| WEPSO05 | Progress of the LUNEX5 Project | 502 |
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| LUNEX5 (free electron Laser Using a New accelerator for the Exploitation of X-ray radiation of 5th generation) aims at investigating the production of short, intense, and coherent pulses in the soft X-ray region, with a 400 MeV superconducting linear accelerator and a laser wakefield accelerator (LWFA), feeding a single Free Electron Laser line with seeding with High order Harmonic in Gas and Echo Enable Harmonic Generation. After the Conceptual Design Report (CDR), R&D has been launched on specific magnetic elements (cryo-ready 3 m long in-vacuum undulator, a variable strong permanent magnet quadrupoles), on diagnostics (Smith-Purcell, electro-optics). In recent transport studies from a LWFA with more realistic beam parameters (1 % energy spread, 1 μm size and 1 mrad divergence) than the ones taken in the CDR, a longitudinal and transverse manipulation enables to provide theoretical amplification. A test experiment is under preparation. The French scientific community is increasing its participation to the use of operating FELs. | ||