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Quasi-monoenergetic electron beams production in a sharp density transition

Abstract : Using a laser plasma accelerator, experiments with a 80 TW and 30 fs laser pulse demonstrated quasi-monoenergetic electron spectra with maximum energy over 0.4 GeV. This is achieved using a supersonic He gas jet and a sharp density ramp generated by a high intensity laser crossing pre-pulse focused 3 ns before the main laser pulse. By adjusting this crossing pre-pulse position inside the gas jet, among the laser shots with electron injection more than 40% can produce quasi-monoenergetic spectra. This could become a relatively straight forward technique to control laser wakefield electron beams parameters.
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S. Fourmaux, Kim Ta Phuoc, P. Lassonde, Sébastien Corde, G. Lebrun, et al.. Quasi-monoenergetic electron beams production in a sharp density transition. Applied Physics Letters, American Institute of Physics, 2012, 101, pp.111106. ⟨10.1063/1.4752114⟩. ⟨hal-01164035⟩

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