Transport simulation of helical plasmas using the TASK/TX code

TASK/TXコードを用いたヘリカルプラズマの輸送シミュレーション

三木 真幸*; 福山 淳*; 本多 充

Miki, Masayuki*; Fukuyama, Atsushi*; Honda, Mitsuru

It is widely accepted that the radial electric field strongly affects plasma confinement through the transport process. We have analysed the time evolution of the radial electric field and the radial transport in plasmas in a helical magnetic configuration by extending the TASK/TX code, which is a one-dimensional dynamic transport code originally developed for axisymmetric plasmas. To apply TASK/TX to helical plasmas, we have included two additional effects; helical neoclassical viscosity force and diffusion due to magnetic braiding. Plasma transport simulation is carried out mainly using the LHD parameters. We obtained negative radial electric field (ion root) with ion heating and positive radial electric field (electron root) with electron heating. Effects of magnetic braiding are also studied.