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Tuning the electron energy by controlling the density perturbation position in laser plasma accelerators

Abstract : A density perturbation produced in an underdense plasma was used to improve the quality of electron bunches produced in the laser-plasma wakefield acceleration scheme. Quasi-monoenergetic electrons were generated by controlled injection in the longitudinal density gradients of the density perturbation. By tuning the position of the density perturbation along the laser propagation axis, a fine control of the electron energy from a mean value of 60 MeV to 120 MeV has been demonstrated with a relative energy-spread of 15 +/- 3.6%, divergence of 4 +/- 0.8 mrad and charge of 6 +/- 1.8 pC.
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P. Brijesh, Cédric Thaury, Kim Ta Phuoc, Sébastien Corde, Guillaume Lambert, et al.. Tuning the electron energy by controlling the density perturbation position in laser plasma accelerators. Physics of Plasmas, American Institute of Physics, 2012, 19 (6), pp.063104. ⟨10.1063/1.4725421⟩. ⟨hal-01164046⟩

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