Abstract
A one-dimensional multifluid hydrodynamic model has been adopted as basis for an investigation of the role of suprathermal electrons on the wave breaking amplitude limit for electrostatic excitations propagating in an electronegative plasma. A three-component plasma is considered, consisting of two inertial cold ion populations of opposite signs, evolving against a uniform background of (non-Maxwellian) electrons. A kappa-type (non-Maxwellian) distribution function is adopted for the electrons. By employing a traveling wave approximation, the first integral for the fluid-dynamical system has been derived, in the form of a pseudo-energy balance equation, and analyzed. The effect of intrinsic plasma parameters (namely the ion density ratio, the ion mass ratio, and the superthermal index of the nonthermal electrons) on the wave breaking amplitude limit is explored, by analyzing the phase space topology of the associated pseudopotential function. Our results are relevant to particle acceleration in Space environments and to recent experiments based on plasma-based accelerator schemes, where the simultaneous presence of negative ions and nonthermal electrons may be observed.
Highlights
A one-dimensional multifluid hydrodynamic model has been adopted as basis for an investigation of the role of suprathermal electrons on the wave breaking amplitude limit for electrostatic excitations propagating in an electronegative plasma
The wave breaking limit (WBL) of a nonlinear plasma excitation represents the maximum amplitude of an electric field generated by the space-charge distribution due to the wave propagating: beyond this limit, the coherent nature of the wave is destroyed and the electromagnetic energy associated with the wave is randomly distributed over the particles, effectively heating the plasma[9,10,11]
These authors recently studied the effects of the kinematic viscosity and ion drag on electrostatic (ES) shocks in N IP21, while the effect of a negative ion beam in a collisionless, unmagnetized quantum ultradense plasma was studied in a subsequent s tudy[22]; interestingly, the coexistence of negative and positive polarity solitary structures was predicted in the latter case
Summary
A one-dimensional multifluid hydrodynamic model has been adopted as basis for an investigation of the role of suprathermal electrons on the wave breaking amplitude limit for electrostatic excitations propagating in an electronegative plasma. The WBL behavior for arbitrary phase speeds in a 1D warm relativistic electron plasma model was investigated in Ref.[33], where the correspondence between wave breaking and background particle trapping was discussed for the first time.
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