Frontiers Journal of Current Engineering Research (FJCER)

THE SIMULATION OF DRIFTS EFFECT ON THE EDGE PLASMA OF SMALL SIZE DIVERTOR TOKAMAK

Keywords : E × B Drift, Diamagnetic Drift, ETB PACS: 52.25.Fi

Abstract

A systematical study of switch on / off (E×B and diamagnetic) drifts effects is reported based on the analysis of simulations by B2SOLPS5.0 2D multifluid transport code. It shown that, electron, ion temperatures and plasma density asymmetry are established due to switching on drifts. The existing plasma density, electron, ion temperatures and heat flux asymmetry is amplified by accounts these drifts. The simulation demonstrated that, the switching on drifts result in formation of edge transport barrier (ETB), which corresponding reduction of transport coefficients inside this barrier. Also at switch on drifts leads to there is no source of charge particles due to ionization of neutrals inside edge transport barrier (ETB). The simulation predicted the switching on / off drifts did change significantly the profile of parallel (toroidal) velocity and there is linear correlation between toroidal velocity V??, ion plasma temperature Ti and poloidal magnetic field Bx at switch on drifts. Also the simulation predication is switching on drifts has significant influence on the radial electric field which is of order of (or close to) neoclassical radial electric field and leads to torque generation, this torque spins down the parallel (toroidal) rotation.

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