Novel features of non-linear Raman instability in a laser plasma

0340087 - FZÚ 2010 RIV DE eng J - Journal Article
Mašek, Martin - Rohlena, Karel
Novel features of non-linear Raman instability in a laser plasma.
European Physical Journal D. Roč. 56, č. 1 (2010), s. 79-90. ISSN 1434-6060. E-ISSN 1434-6079
R&D Projects: GA MŠMT(CZ) 7E08099; GA MŠMT(CZ) LC528; GA ČR GA202/05/2475
Institutional research plan: CEZ:AV0Z10100523
Keywords : laser plasma * non-linear Raman instability
Subject RIV: BH - Optics, Masers, Lasers
Impact factor: 1.513, year: 2010

The electron phase space evolution in a non-relativistic and homogeneous laser plasma generated by a nanosecond laser in a near infrared region in the presence of stimulated Raman scattering is investigated by a numerical simulation. The mechanism of electron acceleration in the potential wells of the plasma wave accompanying the Raman back-scattering is analyzed in a 1D Vlasov-Maxwell model. The dominant wave modes are both the backward and the forward propagating Raman waves, each accompanied by a daughter electrostatic wave. In addition to a strong interaction of plasma electrons with the primary electrostatic wave in the case of back-scattering, a cascading is observed consisting in a secondary scattering of the primary Raman back-scattered wave. This phenomenon reduces the Raman reflectivity and causes an acceleration of electrons against the direction of the heating laser beam.
Permanent Link: http://hdl.handle.net/11104/0183406