Integrated transport simulations of high ion temperature plasmas of LHD

Abstract

An integrated transport simulation code, TASK3D, is developed and applied to the high ion temperature plasma of LHD. The particle and heat transport equations are solved and compared with LHD experimental results. The heat and particle transports are assumed to be the sum of the neoclassical transport and the turbulent transport. The neoclassical transport is evaluated by the LHD/DGN neoclassical transport database, and the gyro-Bohm and the gyro-Bohm + gradT turbulent transport models are applied to the heat transport analysis. On the other hand we assume a constant turbulent transport model for particle transport. Relatively good agreements are obtained between the simulated and experimental profiles of the density and temperature in the steady state plasma of LHD. Next the high ion temperature plasma with the carbon pellet injection is simulated. It is found that the reduction of turbulence transport is the most significant contribution to achieving the high ion temperature and that the reduction of the turbulent transport compared to the L-mode plasma (normal hydrogen plasma) is evaluated to be a factor of about five.