Stability-transport modeling of the SINP tokamak discharges |
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Authors: | S L Ahiri S Mukhopadhyay A N S Iyengar R Pal |
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Institution: | (1) Plasma Physics Group, Saha Institute of Nuclear Physics, I/AF Bidhan Nagar, 700 064 Calcutta, India |
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Abstract: | A one-dimensional stability transport code has been developed to simulate the evolution of tokamak plasma discharges. Explicit
finite-difference methods have been used to follow the temporal evolution of the electron temperature equation. The poloidal
field diffusion equation has been solved at every time step. The effects of MHD instabilities have been incorporated by solving
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
0 discharge m=1, n=1 and m=2, n=1 modes play major role in discharge evolution. These modes are found to result in the positive jump in the loop voltage
which was also observed in the experiments. Hollow current density profile j
φ
and negative shear in the q profile have also been found in the rising phase of a discharge. |
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Keywords: | Transport stability diffusion MHD |
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