2D transport theory for trace impurities in a hydrogen scrape-off plasma flow and its application in the collision-dominated limit
The starting point in this 2D transport theory is the kinetic equation (in cylindrical geometry) for the distribution function of impurity ions with charge Ze and mass M. This includes terms to describe Coulomb collisions with hydrogen ions and electrons as well as electron impact ionisation, recombination and charge exchange. A Fokker-Planck operator describes the Brownian motion of the impurity ions in terms of electron and ion temperatures, centre of mass velocity and convection velocity. The centre of mass velocity is split into a convective and a diffusive part. The convective part is independently calculated from one of the auxiliary conditions, which is readily solved for simple plasma profiles. The equation yields, to a first order approximation, the density distribution of trace impurities in a streaming hydrogen plasma background. This transport theory is currently applied to the numerical computation of 2d density and line radiation profiles of ions in a hydrogen scrape-off plasma, using a Monte Carlo calculation of the C+ sources.
Bibliographic Reference: Paper presented: 16th European Conference on Controlled Fusion and Plasma Physics, Venezia (IT), March 13-17, 1989
Availability: Available from (1) as Paper EN 34775 ORA
Record Number: 198910630 / Last updated on: 1994-12-01
Original language: en
Available languages: en