1D3V PIC simulation of propagation of relativistic electron beam in an inhomogeneous plasma

Relativistic particle acceleration in an electron-positron plasma with a relativistic electron beam

Results from three-dimensional electromagnetic particle simulations of an electron-positron plasma with a relativistic electron beam (y=2) are presented. As part of the initial conditions, a poloidal magnetic field is specified, consistent with the current carried by the beam electrons. The beam undergoes pinching oscillations due to the pressure imbalance. A transverse two-stream instability i...

1D PIC simulation study of nonlinear beam plasma interaction

Since the early days of plasma simulation studies, superthermal electrons having energies much greater than the injected beam electrons have been widespreadly observed. The origin of such superthermal tail in the electron velocity distribution is generally believed due to the second order Fermi acceleration, i.e., the acceleration due to turbulence. In this paper, generation of superthermal ele...

Relativistic electron beam propagation in the earth's atmosphere- modeling results

Linear accelerators (linacs), capable of producing 5 MeV energy electron beams at 80 mA currents, are now down to a size that allow them to be flown on sounding rockets or balloons. This opens up new opportunities for atmospheric/ionospheric modification experiments where the mesosphere and thermosphere regions of the atmosphere can be perturbed down to 40 km altitude. In this paper beam propag...

Propagation of a finite optical beam in an inhomogeneous medium.

The first part of this paper is devoted to extending the Huygens-Fresnel principle to a medium that exhibits a spatial (but not temporal) variation in index of refraction. Utilizing a reciprocity theorem for a monochromatic disturbance in a weakly inhomogeneous medium, it is shown that the secondary wave-front will be determined by the envelope of spherical wavelets from the primary wavefront, ...

Multidimensional electron beam-plasma instabilities in the relativistic regime