Dimensionless Transport Analysis on Plasma Radial Profiles in LHD

For the confinement data analysis of Large Helical Device (LHD), the PRE-TOTAL code is developed for the Toroidal Transport Analysis Code TOTAL. Several new scaling laws are derived using LHD data and medium helical system data, mainly based on dimensionless regression analysis. The global confinement is strongly gyro-Bohm-like. Using same database, the radial profile of diffusion coefficients are obtained, and it is found that the local transport in the core is weakly gyro-Bohm-like, and near the boundary it is strongly gyro-Bohm-like. The global confinement feature is consistent with edge-region transport coefficient. These new scaling laws can be used for the design of future helical reactors 1