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Gyrokinetic Particle Simulations
Gyrokinetic Toroidal Code (GTC)

Gyrokinetic Simulations

     A fully 3D, general geometry gyrokinetic particle code (GTC), which now uses field-line following coordinates, has been successfully developed. Massively parallel simulations have been performed for both turbulent and neoclassical transport studies with new results enabled by utilization of the full power of the T3E at NERSC. For example, by measuring the broadening of radial wave-number spectrum of turbulence in these global gyrokinetic simulations, the turbulence decorrelation by self-generated zonal flows has been quantitatively calculated for the first time [Z. Lin et al., Science, 281, 1835 (1998)].

Gyrokinetic Particle Simulations Group

Stephane Ethier
Wei-li Lee
Jerome Lewandowski
Zhihong Lin
W.X. Wang

Theoretical Collaborators

Taik Soo Hahm
Greg Rewoldt
William Tang
Roscoe White


Visualization of GTC simulations

* ITG movie (AVI format - 123 MB) (QuickTime format - 62 MB): 3D visualization of turbulent electrostatic potential: poloidal contour plot (on left) without flow, (on right) with flow; flux-surface contour plot at r/a=0.25; and iso-surface of high (red band) and low (blue band) potential.
  1. Comparison of nonlinear mode structure: effects of zonal flows
    JPEG (0.3Mb)
  2. Linear eigenmode: same structure with or without zonal flows
    PostScript (1.9Mb)
  3. Nonlinear mode structure: decorrelation by zonal flows
    PPM (0.9Mb)
  4. Nonlinear mode structure: large scale eddies when zonal flows suppressed
    PPM (0.9Mb)
Turbulent Transport

Evolution of spectrum and mode structure

Neoclassical Transport

Comparison of analytic estimates of chii with simulation results
Revised Neoclassical ion heat conductivity for TFTR
Revised Neoclassical ion heat conductivity for DIII-D

Parallel Computing

Gyrokinetic Simulations of Plasma Microinstabilities

Recent Presentations

W.W. Lee: Particle Simulation of Magnetically Confined Plasmas
S. Ethier: Implementation of Mixed-Mode Parallelism

J.L.V. Lewandowski: Neoclassical Radial Electric Field

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