Conservative gyrokinetic Vlasov simulation using Morinishi scheme

Idomura, Yasuhiro   ; Ida, Masato; Tokuda, Shinji; Villard, L.*

A gyrokinetic simulation is an essential tool to study turbulent anomalous transport in tokamak plasmas, and a long time global simulation of driven turbulence in open system is highly desirable towards estimation and prediction of turbulent transport. However, poor conservation properties in conventional gyrokinetic simulations were problematic in such a long time simulation. To overcome this difficulty, a new conservative gyrokinetic code is developed using Morinishi scheme, which was originally developed for conservative simulations of neutral fluid turbulence. In the new code, in addition to the exact particle number conservation, the energy conservation is dramatically improved, and the scheme is robust in a long time simulation. In slab ion temperature gradient driven turbulence simulations, comparisons of the new code and a conventional particle code are presented.