NUMERICAL SIMULATIONS OF THE OXYGEN IMPURITY TRANSPORT AT THE PLASMA PERIPHERY IN A TOKAMAK
The behaviour of oxygen, which is one of the most frequently encountered impurity species in Tokamaks, is particularly complicated owing to the intensive cross charge exchange processes between oxygen and hydrogen. Another complication arises from the fact that oxygen is desorbed from metallic surfaces as hydrogenic or metallic compounds, undergoing a sophisticated multistep evolution before arriving at the neutral atomic state. Here we study the influence of these effects, using the numerical algorithm, which allows fast solution of both the steady state and the time dependent one-dimensional finite rate diffusion equations (1). The auxiliary calculations, accounting for the cross charge exchange and the subroutine describing the low energy chemical kinetics, are incorporated in the code.
Bibliographic Reference: REPORT IPP 1/221, 1983
Record Number: 1989122045600 / Last updated on: 1987-01-01
Available languages: en