Collisional transport in non-neutral plasmas

Abstract

Classical transport theory grossly underestimates collisionally-driven cross-field transport for plasmas in the parameter regime of r cIn current experiments operating in this regime, cross-field test particle transport is observed to be a factor of 10 larger than the prediction of classical theory. Heat conduction is enhanced by up to 300 times over classical theory, and viscosity is up to 10 4 times larger. New guiding center theories of transport due to long-range collisions have been developed that agree with the measurements. Theory also predicts that emission and absorption of plasma waves may further enhance the thermal conduction and viscosity, providing a possible mechanism for anomalous thermal conductivity in the electron channel of fusion plasmas.

Interaction of two charges in a uniform magnetic field: I. Planar problem

“…What attention it has received has tended to be in some limiting regimes such as very strong magnetic field or plasmas with all the particles of the same kind (see [1,2,3,4]) or with one heavy particle idealized as fixed (the diamagnetic Kepler Problem, see [5,6]). In this paper we will study the dynamics of two charged particles in a uniform magnetic field without making any restrictions on the sizes of the magnetic field, the charges or the masses.…”

Shear reduction of 2D point vortex diffusion

“…Perturbed 2D vortex velocities due to 3D end effects have been considered with regard to collisional viscosity [17,18], and are presently being incorporated into diffusion theory [13]. Here, several effects may be important.…”

Thermally excited Trivelpiece–Gould modes as a pure electron plasma temperature diagnostic

“…4 The thermal equilibrium characteristics become most evident with the formation of Coulomb crystals 5 when pure ion plasmas are cooled to the liquid and solid regimes at sub-Kelvin temperatures. The higher temperature plasma regime studied here is also well-described by nearequilibrium statistical mechanics, 6 with kinetic theories of waves and transport coefficients 7 amenable to experimental tests.…”