Laser triggered injection of electrons in a laser wakefield accelerator with the colliding pulse method
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Laser triggered injection of electrons in a laser wakefield accelerator with the colliding pulse method

  • Author(s): Nakamura, K.;
  • Fubiani, G.;
  • Geddes, C.G.R.;
  • Michel, P.;
  • van Tilborg, J.;
  • Toth, C.;
  • Esarey, E.;
  • Schroeder, C.B.;
  • Leemans, W.P.
  • et al.
Abstract

An injection scheme for a laser wakefield accelerator that employs a counterpropagating laser (colliding with the drive laser pulse, used to generate a plasma wake) is discussed. The threshold laser intensity for electron injection into the wakefield was analyzed using a heuristic model based on phase-space island overlap. Analysis shows that the injection can be performed using modest counterpropagating laser intensity a_1 < 0.5 for a drive laser intensity of a_0 = 1.0. Preliminary experiments were preformed using a drive beam and colliding beam. Charge enhancement by the colliding pulse was observed. Increasing the signal-to-noise ratio by means of a preformed plasma channel is discussed.

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