Modelling of radiative and reactive plasmas

Margarita Baeva
IPP FZ-Julich
Seminar at FOM, December 7th, 2004

Since the establishment of the detachment regime for ITER, tokamak 
plasmas have shown a chemical richness in the divertor not otherwise 
encountered in fusion plasmas. This made also smaller plasma devices, 
usually used to study reactive plasmas, directly relevant for fusion 
research. The transfer of knowledge about the basic controlling mechanisms 
between these devices can be achieved via computer simulation.
Applying dedicated fusion codes to technical plasmas (and plasma 
simulators) and vice versa: plasma chemistry codes to fusion edge plasmas 
is only now beginning in a more systematic way.
As a part of such efforts, recent modelling of photon transport and 
collisional-radiative kinetics will be presented in this talk. Monte Carlo 
modules developed for lighting applications have been implemented into the 
EIRENE code, to study effects of resonance hydrogen line reabsorption on 
ITER-divertor performance. Earlier developed packages (used to study 
electron-heavy particle and chemical kinetics in microwave excited plasma 
in N2, O2, and their mixtures) are presently reformulated to allow study of 
the nitrogen (N2/N) transport in divertors. The purpose is to assess the 
spatial distribution of nitrogen ion sources, if N2 is puffed as radiation 
cooling gas or, quite speculative, perhaps as a scavenger to suppress a C:D 
deposition. Calculation results obtained under various plasma conditions 
(e.g. equilibrium/non-equilibrium; low/high pressure) will be illustrated.