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Développement d'un accélérateur laser-plasma à haut taux de répétition pour des applications à la diffraction ultra-rapide d'électrons

Abstract : Electronic microscopy and electron diffraction allowed the understanding of the organization of atoms in matter. Using a temporally short source, one can measure atomic displacements or modifications of the electronic distribution in matter. To date, the best temporal resolution for time resolved diffraction experiments is of the order of a hundred femtoseconds (fs). Laser-plasma accelerators are good candidates to reach the femtosecond temporal resolution in electron diffraction experiments. Such accelerators used to work at a low repetition rate, so that it was necessary to develop a new one operating at a high repetition rate in order to accumulate a large amount of data. In this thesis, a laser-plasma accelerator operating at the kHz repetition rate was developed and built. This source generates electron bunches at 100 keV from 3 mJ and 25 fs laser pulses. The physics of the acceleration has been studied, and the effect of the laser wavefront on the electron transverse distribution has been demonstrated.
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Submitted on : Monday, March 27, 2017 - 1:55:59 PM
Last modification on : Friday, December 3, 2021 - 11:34:04 AM
Long-term archiving on: : Wednesday, June 28, 2017 - 2:30:17 PM

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  • HAL Id : tel-01496310, version 1

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Benoit Beaurepaire. Développement d'un accélérateur laser-plasma à haut taux de répétition pour des applications à la diffraction ultra-rapide d'électrons. Physique [physics]. Ecole Polytechnique (EDX), 2016. Français. ⟨tel-01496310⟩

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