title: Electromagnetic instability in plasmas heated by a laser field.
abstract: Electromagnetic instability is investigated in homogeneous plasmas heated by a laser wave in the range α=v_{0}^{2}/v_{t}^{2}≤2, where v_{0} is the electron quiver velocity and v_{t} is the thermal velocity. The anisotropic electron distribution function that drives unstable quasistatic electromagnetic modes is calculated numerically with the Vlasov-Landau equation in the high ion charge number approximation. A dispersion relation of electromagnetic waves which accounts for further nonlinear terms on v_{0}^{2} from previous results is derived. In typical simulation with ion charge number Z=13, a temperature T=5keV, a density n=9.8×10^{20}cm^{-3}, and a laser wavelength λ_{laser}=1.06μm, growth rates larger than 10^{12}s^{-1} in the quasicollisionless wave-number range were found for α≥1. In the same physical conditions and in the mildly collisional range a growth rate about 10^{11}s^{-1} was also obtained. The extent of the growth wave-number region increases significantly with increasing α.
authors.affiliation: Laboratoire Electronique Quantique, Faculté de Physique, USTHB, BP 32 El Alia 16111 Bab Ezzouar, Algiers, Algeria.
authors.forename: A
authors.initials: A
authors.lastname: Bendib
authors.affiliation: Laboratoire Electronique Quantique, Faculté de Physique, USTHB, BP 32 El Alia 16111 Bab Ezzouar, Algiers, Algeria.
authors.forename: K
authors.initials: K
authors.lastname: Bendib-Kalache
authors.affiliation: Laboratoire de Physique des Gaz et des Plasmas, UMR 8578, Université Paris-Sud 11, Orsay, France.
authors.forename: B
authors.initials: B
authors.lastname: Cros
authors.affiliation: Laboratoire de Physique des Gaz et des Plasmas, UMR 8578, Université Paris-Sud 11, Orsay, France.
authors.forename: C
authors.initials: C
authors.lastname: Deutsch
authors.affiliation: Laboratoire de Physique des Gaz et des Plasmas, UMR 8578, Université Paris-Sud 11, Orsay, France.
authors.forename: G
authors.initials: G
authors.lastname: Maynard