Modelling of the 2-Dimensional Structure and Impurity Transport for a Scrape-off Layer with a Solid Limiter

摘要

A 2 dimensional modeling of a scrape off layer (SOL) with a solid limiter is presented. After the plasma in a SOL is calculated by a plasma code, SLIM, based on the 2 dimensional fluid equations with source terms due to neutral particles, the neutral transport is calculated by a Monte Carlo code, EIRENE, with the use of the results by SLIM. Then these two calculations are iteratively performed until a nearly self consistent result is obtained. Ionization of neutral impurity particles ejected from the first wall and random diffusion of the charged impurities across the magnetic field lines in the SOL plasma are simulated by a Monte Carlo method. From the statistical analysis on the numerical results the screening efficiency of a SOL, impurity redeposition rate and behavior of impurities in a SOL are analyzed.