Modelling the transport of deuterium and tritium neutral particles in a divertor plasma

摘要

a fluid model for transport of deuterium and tritium atoms in two-dimensional geometry of a poloidal divertor is elaborated by taking into account the coupling of both isotopes through the processes of cross-charge-exchange. calculations are performed for the plasma parameters predicted with the code package b2-eirene (solps4.3) for the divertor region in iter. the results demonstrate that the transparency of the scrape-off layer for neutral particles generated by recycling on target plates and recombination of electrons and ions in the plasma volume can be significantly different for deuterium and tritium atoms. this difference has to be taken into account by considering the global particle balances in a reactor. the numerical approach applied for calculations is verified by comparing with an analytical model elaborated for the case of plasma parameters homogeneous in the divertor domain.