Electron beam relaxation in inhomogeneous plasmas

Etching with Electron Beam Generated Plasmas

Drift wave vortices in inhomogeneous plasmas

The effects of density and temperature gradients on drift wave vortex dynamics are studied using a fully nonlinear model with the Boltzmann density distribution. The equation based on the full Boltzmann relation, in the short wavelength ( -ps ) region, possesses no localized monopole solution, while in the longer wavelength [ (psrn ) “‘1 region the density profile governs the existence of monop...

Collisionless relaxation in non-neutral plasmas.

A theoretical framework is presented which allows us to quantitatively predict the final stationary state achieved by a non-neutral plasma during a process of collisionless relaxation. As a specific application, the theory is used to study relaxation of charged-particle beams. It is shown that a fully matched beam relaxes to the Lynden-Bell distribution. However, when a mismatch is present and ...

Temperature and anisotropic-temperature relaxation measurements in cold, pure-electron plasmas

Plasma temperatures in the range 25 to 2310 K have been measured using a cryogenic, ultra-high vacuum, pure-electron plasma trap. The rate n at which the temperatures parallel and perpendicular to the applied magnetic field relax to a common value has been measured over the temperature range 28 to 3.8310 K and the magnetic field range 20 to 60 kG. This rate n is closely related to the plasma co...

Magnetised Electron - Positron Plasmas

Electrostatic oscillations in cold electron-positron plasmas can be coupled to a propagating electromagnetic mode if the background magnetic field is in-homogeneous. Previous work considered this coupling in the quasi-linear regime, successfully simulating the electromagnetic mode. Here we present a stability analysis of the non-linear problem, perturbed from dynamical equilibrium , in order to...