Emission profile reconstruction of edge plasma of Aditya Tokamak

Nuclear fusion will be one of the promising ways to generate electrical power in the next century. This source should be a safe and clean source of electricity for which fuels are abundant. Most current research into nuclear fusion is directed towards magnetic confinement of extremely hot plasma in a device called Tokamak. Before Fusion reactors become operational, still many problems need to be solved, both in fundamental and technological problems from which plasma wall interaction and magnetic field fluctuation are some of the major ones. To address these problems Aditya Tokamak in the Institute for plasma research is equipped with several high resolution diagnostics. One of them Visible light Tomography setup is described in this paper. This system is suitable for studying fluctuations and to determine the local density of species that give rise to radiation which is important for plasma wall interaction. This paper describes use of tomography diagnostic to resolve the local emission of visible light in plasma from line integrated measurements in one poloidal cross section. Multiplicative algebraic reconstruction technique is developed to reconstruct the H_α emission profile. A code is written in MATLAB for extracting the informative projection data from the raw data file obtained from Aditya Tokamak. MART code written in MATLAB has flexibility to change the various parameters like geometrical parameters, relaxation factor and pixel size.