Enhancement of high-energy electron generation through suppression of Raman backscatteringR. M. G. M. Trines1, L. P. J. Kamp1, T. J. Schep1, W. P. Leemans2, E. H. Esarey2 and F. W. Sluijter1
1 Eindhoven University of Technology - P.O. Box 513 5600 MB Eindhoven, The Netherlands
2 Lawrence Berkeley National Laboratory - Berkeley, CA 94720, USA
(Received 5 January 2004; accepted 23 March 2004)
The effect of Raman backscattering (RBS) on high-energy electron generation in laser-plasma interaction has been investigated for laser intensities well above the wave breaking and electron trapping threshold. One-dimensional particle-in-cell simulations show that suppression of RBS increases the high-energy electron yield in this regime. RBS-induced heating causes heavy beam loading and damping of the laser wake. Its suppression leads to higher wake amplitudes and higher particle energies. RBS suppression through direct stimulation of Raman forward scatter is demonstrated. The implications for high-energy electron production through laser-plasma interaction are discussed.
41.75.Jv - Laser-driven acceleration.
52.38.Kd - Laser-plasma acceleration of electrons and ions.
52.38.Bv - Rayleigh scattering; stimulated Brillouin and Raman scattering.
© EDP Sciences 2004