Effects Of Particle Pinch And Fuelling Depth On The Fusion Performance Of A Tokamak Reactor

The evolution of the plasma temperature and density in an international thermonu-clear experimental reactor-like fusion device has been studied by numerically solving the energy transport equation coupled with the particle transport equation. The plasma is primarily heated by the alpha particles which are produced by the deuterium-tritium fusion reactions. The nonlinear terms induced by the fusion reaction in the formulas are treated with a predictor-corrector method and the transport coefficient is evaluat-ed by matching the scaling law of energy confinement time. The fusion performance calculated with the modelling results accord well with the results calculated with other models in the references. We add the convective term induced by the particle pinch in the modelling and simulate the evolution of plasma under different conditions to study the effect of particle pinch on fusion reactor. It is shown that the particle pinch has significant effects on the fusion performance and profiles of a fusion reactor. When the volume-averaged density is fixed, particle pinch can remarkably lower the pedestal density with the fusion performance and the central pressure almost unchanged. When the particle source or the pedestal density is fixed, the particle pinch can significantly enhance the fusion performance, with the central pressure also significantly raised.Based on the work above, the effect of fuelling depth on the particle confinement and fusion performance of a fusion reactor is studied. The loss processes of particle and energy induced by the open magnetic line in the scrape-off layer is included by ex-tending the computation boundary from the last closed magnetic flux to the device wall and adding the parallel loss term. By comparing the simulation results with different felling depthes, it is shown that the particle confinement and fusion performance are significantly dependent on the fuelling depth. The enhancement of fusion performance is due to the better particle confinement induced by deeper particle fuelling.