| A more optimal economic performance of a fusion reactor will be achieved by obtaining a full understanding of plasma transport, and finding effective ways to control it. It is necessary to gain an overall theoretical model to predict the transport and the corresponding numerical simulation code. A transport model based on a fluid approximation is presented and discussed in this paper. One-dimensional transport code which is suitable for the calculation of plasma parameters on HL-2A tokamak is integrated initially by the transplantation of the RITM code[1, 2].Radial profiles of the basic parameters (safety factors, electron temperature and density, transport coefficients etc.) and transport coefficients of individual unstable modes are achieved by numerical calculation. Characteristics of the various unstable modes which dominate the transport in the plasma core and at the edge are discussed initially. It has been found that the ITG mode dominates the core transport but it isn't suppressed effectively at the edge and DA mode plays an important role in the edge transport in the low confinement mode in the modelling of HL-2A tokamak. The modelling result also shows that the temperature gradient and density gradient of electrons and ions change gently and that the transport coefficient of electrons and ions decline at the edge, obviously while it doesn't reach the neo-classical level. Modelling results of HL-2A and JET by one-dimensional transport code are basically consistent, which shows that the transport model in this paper has a certain reference value for the experimental research of HL-2A tokamak in high confinement mode. |
PDF Full Text Request