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Quasi-monoenergetic electron beams produced by colliding cross-polarized laser pulses in underdense plasmas
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Quasi-monoenergetic electron beams produced by colliding cross-polarized laser pulses in underdense plasmas 1 Laboratoire d'Optique Appliquée, ENSTA, CNRS, Ecole Polytechnique, UMR 7639, 91761 Palaiseau, France 2 Laboratoire de Physique des Gaz et des Plasmas, CNRS, UMR 8578, Université Paris XI, Bâtiment 210, 91405 Orsay cedex, France 3 Département de Physique Théorique et Appliquée, CEA, DAM Ile-de-France, BP 12, 91680 Bruyères-le-Châtel, France 4 Author to whom any correspondence should be addressed. E-mail: victor.malka@ensta.fr Abstract. The interaction of two laser pulses in an underdense plasma has been proven to be able to inject electrons into plasma waves, thus providing a stable and tunable source of electrons. Whereas previous works focused on the 'beatwave' injection scheme in which two lasers with the same polarization collide in a plasma, this present paper studies the effect of polarization and more specifically the interaction of two colliding cross-polarized laser pulses. It is shown both theoretically and experimentally that electrons can also be preaccelerated and injected by the stochastic heating occurring at the collision of two cross-polarized lasers and thus, a new regime of optical injection is demonstrated. It is found that injection with cross-polarized lasers occurs at higher laser intensities.
Source: http://www.iop.org/EJ/abstract/-alert=29894/1367-2630/11/1/013011
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