Modeling and simulation of power multiplication in tokamak using impurity concentration

In this work a c-language based program DRF (Dynamics of Fusion Reactor) has been developed to study the time behavior of plasma parameter's in typical Toroidal Fusion Reactor based on Magnetic Confinement. The Modeling of torus reactor without and with impurities have been done. This program is based on plasma volume averaged density and energy balance equations for single predominant ion behaviors. Two major sources of plasma heating (i.e. auxiliary heating and alpha heating) have been used in this work. A simplified model for Bremsstrahlung and Cyclotron loss has also been employed in the work. Effect of MHD instabilities have been add in energy confinement time through plasma Beta (ratio of kinetic pressure to magnetic pressure). Design parameters (ratio of kinetic pressure to magnetic pressure). Design parameters of TFTR have been used in this work. Simulation shows that stable reactor operation in feasible for N = 5.4 x10/sup -13/cm/sup -3/, T= 11 keV and auxiliary heating of 30 MW for first five seconds. An optimum volume with an optimum minor radius comes to be 1.5 x 10/sup -8/cm/sup -3/ and 50 cm respectively. The effect of change in initial fuel density and magnetic field has been studied. The effect of change in T, N, Tau, P/sub alpha/, P/sub cyc/, P/sub brem/, P/sub conv/ due to change in impurity concentration have also been studied in this work. Result shows acceptable impurity concentration limit for carbon, oxygen, silicon, iron, molybdenum and tungsten (wolfram) are 9.47 x 100/sup -2/, 5.45x 10/sup -2/, 2.7x 10/sup -2/, 1.065 x 10/sup -2/, 3.3x 10/sup -3/ and 6.75 x 10/sup -4/ respectively. (author)