2-D electric fields and drifts near the magnetic separatrix in divertor tokamaks

摘要

A 2-D calculation is presented for the transport of plasma in the edge region of211u001ea divertor tokamak solving continuity, momentum, and energy balance fluid 211u001eequations. The model uses anomalous radial diffusion, including perpendicular ion 211u001emomentum, and classical cross-field drifts transport. Parallel and perpendicular 211u001ecurrents yield a self-consistent electrostatic potential on both sides of the 211u001emagnetic separatrix. Outside the separatrix, the simulation extends to material 211u001edivertor plates where the incident plasma is recycled as neutral gas and where 211u001ethe plate sheath and parallel currents dominate the potential structure. Inside