Premium
MOdelling of Impurity Generation and Transport in Scrape‐Off Layers
Author(s) -
Kawamura T.,
Ono T.,
Yoshida H.
Publication year - 1990
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.2150300119
Subject(s) - limiter , impurity , plasma , monte carlo method , materials science , atomic physics , ionization , magnetic field , toroid , penetration (warfare) , ion , physics , nuclear physics , telecommunications , statistics , mathematics , quantum mechanics , operations research , computer science , engineering
The scrape‐off layer plasma is simulated with a 2‐dimensional fluid plasma code (SLIM) and a Monte Carlo neutral transport code (DEGAS) where the two codes are made runs iteratively until almost stable results are obtained. The geometry of the scrape‐off layer is referred to a toroidal pump limiter system. In the scrape‐off plasma thus obtained, ionization of neutral impurity particles ejected from the first wall, drift motion of charged impurities along the magnetic field lines and random diffusion across the magnetic field lines are simulated by a Monte Carlo method using atomic reaction rates of relevant processes and transport coefficients in the scrape‐off layer. From the statistics on calculations of destination of many impurity particles, the screening efficiency of the scrape‐off layer for impurity penetration into the core plasma, the impurity redeposition rate on the first wall, the exhaust efficiency of impurities are quantitatively analyzed.