A one-dimensional stability transport code has been developed to simulate the evolution of tokamak plasma discharges. Explick finite-difference methods have been used to follow the temporal evolution of' dre electron temperature equation. The poloidal field diffusion equation has been solved at every time step. The effects of MHD instabilities have been incorporated by soh'ing equations for MHD mixing and tearing modes as and when required. The code has been applied to follow the evolution of tokamak plasma discharges obtained in the Saha institute of Nuclear Physics (SINP) tokamak, From these simulations, we have been able to identify the possible models of thermal conductivity, diffusion and impurity contents in these discharges. Effects of different MHD modes have been estimated. It has been found that in low q~ discharge 't~'~ --t, ~l = 1 and m = 2, ~ = 1 modes play n-tajor role in discharge evo[u6on. These modes are found to result in the positive jump in tSe loop voltage whicla w;ts also observed in the experiments, Hollow current density profile j,~ and negative shear ill the q profile have also been found in the rising phase of a discharge.
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