Analysis of internal transport barrier formation in tokamak reactor plasmas

Since a high performance operation is needed in the future fusion reactor, it is expected that the operation with Internal Transport Barrier (ITB) is utilized to improve core plasma confinement in the reversed magnetic shear. In this study, firstly, the simulation results are compared with the experimental result, and the validity of the model is checked. Secondly, the effects of the magnetic shear and the pellet injection on ITB formation are simulated in tokamak reactor using the Toroidal Transport Analysis Linkage code TOTAL. In this simulation, the ITB formation is confirmed in the condition that magnetic shear is nearly zero and the density gradient exists, and it found that the reversed magnetic shear configuration is effective in the operation with ITB. (author)