EFFECT OF RECOMBINATION PROCESSES ON PLASMA PROPERTIES IN THE SCRAPE OFF LAYER OF TOKAMAK DEVICES L. Popova1,G. Kamberov2, T.Nikolov1, P.Marinov3, D.Mitev4

The effect of particle recombination in the scrape-off-layer is investigated performing particle in cell (PIC) simulation of tokamak plasma. For this purpose special routines for Monte Carlo simulation of radiative and collisional recombination are developed using theoretical predictions for the rate coefficients validated up to 100eV . Simulations with plausible assumptions for the density profile of neutral particles provides to some ambiguity. It can be avoided performing self-consistent simulation of all particles in which neutral content is determined by the rivaling recombination and ionization processes. It has practical implications in the search of conditions to prolong plasma confinement with acceptable divertor loads.