Investigation of neutral particle behaviour between plasma and wall including wall interactions

Abstract

The behaviour of neutrals in the wall regime of a plasma is investigated by means of a kinetic description. Interaction of the neutrals with the plasma particles by charge exchange and ionisation processes is taken into account as well as different reflection mechanisms of neutrals from the wall. The starting point for the numerical description is the Boltzmann equation. Results for steady and time dependent conditions are obtained. The latter are provided by a continuous or pulsed influx of neutral atoms simulating desorption processes at the wall as well as steady or pulsed gas inlet operation of Tokamak devices.