Stability-transport modeling of the SINP tokamak discharges

Pramana

S Lahiri¹  A N S Iyengar¹  R Pal¹  S Mukhopadhyay¹ 

[1] Plasma Physics Group, Saha Institute of Nuclear Physics. 1/AF Bidhan Nagar, Calcutta 700 064, India$$

关键词: Transport;    stability;    diffusion;    MHD.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

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 𝑞𝑎 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 𝑗𝜙 and negative shear in the 𝑞 profile have also been found in the rising phase of a discharge.

【 授权许可】

Unknown