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Idomura, Yasuhiro
no journal, ,
To analyze electrostatic turbulence including trapped electron modes (TEMs), a kinetic electron model is developed in the gyrokinetic full-f Eulerian code GT5D. This model computes turbulent fields by assuming kinetic trapped electrons responses and adiabatic passing electrons, and describes collisional processes of the ion-electron system using multi-species Fokker-Planck operator. Linear growth rates of ITG-TEMs and ion-electron neoclassical transport are successfully reproduced, and a nonlinear critical temperature gradient is found by decaying turbulence simulations.
Idomura, Yasuhiro
no journal, ,
In this talk, main results from the 4th cycle IFERC-CSC project GT5DISO2 are reviewed. In the 3rd cycle project, it was found that simulations including electron turbulence are needed to reproduce the hydrogen isotope effect. To resolve this issue, in the 4th cycle project, a new kinetic electron model is developed in the plasma turbulence code GT5D, and its accuracy is verified through benchmark calculations of collisional transport phenomena and linear stability analyzes of micro-instabilities. Ion temperature gradient driven turbulence simulations including the new electron model are performed, and a new turbulence saturation mechanism due to kinetic electrons responses is found.
Idomura, Yasuhiro
no journal, ,
A Gyrokinetic Toroidal 5D full-f Eulerian code GT5D is extended including a new hybrid kinetic electron model, which enables us to address ITER relevant issues related to electron turbulence. In this talk, physics backgrounds and computational properties of the new hybrid kinetic electron model are discussed, and applications of the model to ITER relevant issues such as the isotope effect of turbulent plasma transport and the plasma rotation change induced by electron heating are presented. These simulation studies show that electron turbulence plays a critical role in ITER, and thus, the new hybrid kinetic electron model is essential for analyzing the performance of core plasmas in ITER.