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Title: Electromagnetic Gyrokinetic Simulations

A new electromagnetic kinetic electron {delta} particle simulation model has been demonstrated to work well at large values of plasma {beta} times the ion-to-electron mass ratio. The simulation is three-dimensional using toroidal flux-tube geometry and includes electron-ion collisions. The model shows accurate shear Alfven wave damping and microtearing physics. Zonal flows with kinetic electrons are found to be turbulent with the spectrum peaking at zero and having a width in the frequency range of the driving turbulence. This is in contrast with adiabatic electron cases where the zonal flows are near stationary, even though the linear behavior of the zonal flow is not significantly affected by kinetic electrons. zonal fields are found to be very weak, consistent with theoretical predictions for {beta} below the kinetic ballooning limit. Detailed spectral analysis of the turbulence data is presented in the various limits.
Authors:
Publication Date:
OSTI Identifier:
15013650
Report Number(s):
UCRL-CONF-201136
TRN: US0600134
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: 45th Annual Meeting of the Division of Plasma Physics, Albuquerque, NM, United States, Oct 27 - Oct 31, 2003
Research Org:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 74 ATOMIC AND MOLECULAR PHYSICS; ALFVEN WAVES; DAMPING; ELECTRON-ION COLLISIONS; ELECTRONS; FREQUENCY RANGE; GEOMETRY; KINETICS; PHYSICS; PLASMA; SHEAR; SIMULATION; TURBULENCE