Mffect of non-Maxwellian distribution on the neoclassical transport and the possibility of transport improvement

点击翻译按钮获取中文摘要

Recently, a rapid increase of ion temperature has been observed in LHD high-Z plasma. In this plasma, the strong tangentially injection NBI heating is applied to a low-density plasma and beam ion density becomes comparable to the background electron density Therefore a consistent analysis including the bean ion distribution is necessary to determine the radial electric field.Effect of tangentially injected beam ions on the radial electric field transition is studied in LHD plasma. The beam ion transport is analyzed by GNET/FIT and the neoclassical transport is by DCOM/NNW. It is found that the radial transport of tangentially injected beam ions during slowing-down is very small compared to that of thermal ions and the net ion particle flux is reduced effectively by the existence of the slowing-down beam ions. Also we found that this reduction of net ion particle flux can enhance the transition of the radial electric field to the electron root in LHD.