Vlasov simulation of electron hole propagation in plasmas with super-thermal particles

The propagation of stationary electron holes in collisionless plasmas, is studied. Vlasov equation for the electrons and ions together with Poisson equation are solved based on the method of characteristics. In the present investigation the plasma background distribution function (DF), is considered to be a non-Maxwellian one, kappa type, which contains super- thermal particles as a high-energy tail. The results concerning the propagation of a single hole and collision of two holes in plasmas with kappaDF with different values of kappa are compared with the Maxwellian plasmas. It is shown that, for the same parameters, different kappas gives rise to significant deviations from Maxwellian DF. Moreover, the limit of large kappa s is identical to Maxwellian case, which is consistent with asymptotic behavior of kappaDF.