Effect of velocity diffusion on the propagation of nonlinear plasma wavesF. Valentini and P. Veltri
Dipartimento di Fisica, Università della Calabria, and CNISM, Sezione di Cosenza - 87036 Rende (CS), Italy
received 28 September 2007; accepted in final form 5 November 2007; published January 2008
published online 3 December 2007
The propagation of plasma waves in unmagnetized plasmas has been the subject of several numerical and analytical studies since long time and surely represents a problem of crucial importance in plasma physics. In this paper we focus on the production of nonlinear plasma waves as the result of the so-called nonlinear Landau damping phenomenon in a realistic situation, where particle velocity diffusion is taken into account. The nonlinear Landau damping phenomenon of plasma waves has been recently analyzed in laboratory experiments with pure electron plasmas; we numerically reproduce this real experimental situation by means of collisional particle in cell (PIC) simulations that allow us to answer important questions: when and how do collisions affect the launching of nonlinear plasma waves?
52.35.Fp - Electrostatic waves and oscillations (e.g., ion-acoustic waves).
52.35.Mw - Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.).
52.65.Ff - Fokker-Planck and Vlasov equation.
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