Simulation of edge-plasma profiles and turbulence related to L-H transitions in211 tokamaks

摘要

Understanding plasma profile evolution and plasma turbulence are two important211u001easpects of developing a predictive model for edge-plasma in tokamaks and other 211u001efusion-related devices. Here they describe results relevant to the L-H transition 211u001ephenomena observed in tokamaks obtained from two simulations codes which 211u001eemphasize the two aspects of the problem. UEDGE solves for the two-dimensional (2-211u001eD) profiles of a multi-species plasma and neutrals given some anomalous cross-211u001efield diffusion coefficients, and BOUT solves for the three-dimensional (3-D) 211u001eturbulence that gives rise to the anomalous diffusion. These two codes are thus 211u001ecomplementary in solving different aspects of the edge-plasma transport problem; 211u001eultimately, they want to couple the codes so that UEDGE uses BOUT's turbulence 211u001etransport results, and BOUT uses UEDGE's plasma profiles with a fully automated 211u001eiteration procedure. This goal is beyond the present paper; here they show how 211u001eeach aspect of the problem, i.e., profiles and turbulent transport, can 211u001econtribute to L-H type transitions.