Comparison of carbon density distribution in L-mode plasma discharges in TFTR tokamak using the Mixed Bohm/gyro- Bohm and Multi-Mode-95 transport models

The behaviors of carbon density distribution in low confinement mode (L-mode) plasma in TFTR Tokamak are investigated using 1.5D BALDUR integrated predictive modeling code. In each simulation, either turbulent transport either Mixed Bohm/gyro-Bohm (Mixed B/gB) turbulent transport model or Multi-Mode (MMM95) turbulent transport model is used to describe thermal, particle, and impurity transports in the core region of the tokamak. It is found that, the simulations using both turbulent transport models agree equally well with experimental results, with an average RMS of 7-20% for the simulations with Mixed B/gB model and 9-16% for the simulations with MMM95 model. (paper)