Gyrokinetic Turbulent Transport Simulations on Steady Burning Condition in D-T-He Plasmas

Abstract

Ion temperature gradient (ITG) and trapped electron modes (TEM) driven turbulent transport in an ITER-like plasma is investigated by means of multi-species gyrokinetic Vlasov simulations with D, T, He, and real-mass kinetic electrons including their inter-species collisions. Beyond the conventional zero-dimensional power balance analysis presuming the global energy and particle confi nement times, gyrokinetic-simulation-based evaluation of a steady burning condition with He-ash exhaust and D-T fuel inward pinch is demonstrated. It is clari fied that a significant imbalance appears in the turbulent particle flux for the fuel ions of D and T, depending on the D-T density ratio and the He-ash accumulation. Then several profi le regimes to satisfy Reiter s steady burning condition are, for the fi rst time, identi fied by the gyrokinetic simulation. Also, the impacts of zonal flows and nonthermal He-ash on the optimal pro file regimes are examined.