The role of thermal noise on key parameters governing the improvement of tokamak fusion reactor efficiency using aneutronic D-3He fuel


 In this study the time evolution of energy and particles densities in burning plasma for D3He fuel in fusion reactors in the presence of thermal noise are investigated. The fusion reaction takes places in plasma of deuterium and helium3 heated to millions of degrees. It is expected that at this temperature, the thermal noise could have a significant effect on plasma behavior and not considered in the solution of equations so far, so this effect is intended for the first time in this work. In order to attain a proper set of particle and energy balance equations, an appropriate thermal noise term is considered in the set of four coupled differential equations. Such form of thermal noise is standard in researches of Langevin dynamic equations, and also consistent with fluctuation-dissipation-theorem. These equations are solved simultaneously by numerical methods. The results of the calculations for fusion power, particles densities, fusion energy density and quality factor in two states of without noise and with noise show that in the conditions where the thermal noise is considered, the above parameters and the quality factor are increased and actually the system performance is improved.