Effects of plasma shaping on ITG/TEM instability in a full-f gyrokinetic

抄録

The stabilising influence of plasma shaping on turbulent transport due to ion temperature gradient (ITG) modes and trapped electron modes (TEMs) have proven difficult to study theoretically and the existing numerical studies are based on either flux tube or delta-f gyrokinetic (GK) codes.GKNET is a full-f electrostatic gyrokinetic Vlasov code which uses a Cartesian grid in the poloidal plane and computes the gyro-averaging operators by taking sample points on the real space grid along the particles' gyrating trajectories. This allows us better treatment of finite Larmor radius effects and arbitrary magnetic configurations. Based on this code, we investigate the magnetic shaping effects on Ion Temperature Gradient (ITG) mode and Trapped Electron Mode (TEM). In this study, we especially focus on the impact of elongation and trianglarity on the growth rate of linear ITG/TEM instability and their poloidal eigenfunction.