Gyrokinetic simulations in general geometry and applications to collisional damping of zonal flows

Lin, Z. ; Hahm, T.S. ; Lee, W.W. ; Tang, W.M. ; White, R.B.

Princeton University. Plasma Physics Laboratory.

关键词: 70 Plasma Physics And Fusion;    Plasma Simulation;    Temperature Gradients;    Ion Temperature;    Plasma Drift;   

DOI  :  10.2172/751257
RP-ID  :  PPPL--3437
RP-ID  :  AC02-76CH03073
RP-ID  :  751257

美国|英语

来源: UNT Digital Library

【 摘 要 】

A fully three-dimensional gyrokinetic particle code using magnetic coordinates for general geometry has been developed and applied to the investigation of zonal flows dynamics in toroidal ion-temperature-gradient turbulence. Full torus simulation results support the important conclusion that turbulence-driven zonal flows significantly reduce the turbulent transport. Linear collisionless simulations for damping of an initial poloidal flow perturbation exhibit an asymptotic residual flow. The collisional damping of this residual causes the dependence of ion thermal transport on the ion-ion collision frequency even in regimes where the instabilities are collisionless.