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A 2D multifluid model for deuterium plasma and impurity ions has been applied to the problem of plasma and nickel ions transport in the FTU tokamak scrape-off layer (SOL). The model is based on the electron-ion fluid equations for background plasma and rate equations for impurities. An analytical model for neutrals is employed allowing recycling of hydrogen, sputtering and self-sputtering of nickel atoms at the target in a self-consistent way with boundary plasma dynamics to be taken into account. Equations of the model are solved in the slab geometry using the 2D multifluid code EPIT. Plasma parameters in the SOL are investigated under conditions when the physical sputtering at the target plate is the only mechanism of the impurity production. Calculations performed for nickel ions in the simplified poloidal geometry of the FTU tokamak scrape-off layer indicate the existence of a self-regulating mechanism limiting the electron temperature in the SOL below 30 eV. A comparison of the calculated results with the experimental data is also reported.

Additional information

Authors: ZAGORSKI R, Institute of Plasma Physics and Laser Microfusion, Warsaw (PL);PERICOLI-RIDOLFINI V, ENEA, Centro Ricerche Energia Frascati, Roma (IT);PIERONI L, ENEA, Centro Ricerche Energia Frascati, Roma (IT)
Bibliographic Reference: Paper presented: 4th International Conference on Plasma Edge Theory in Fusion Devices, Varenna (IT), October 4-6, 1993
Availability: Available from (1) as Paper EN 37963 ORA
Record Number: 199311564 / Last updated on: 1994-11-28
Original language: en
Available languages: en