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produce magnetic equilibria in GTC are read directly into ANC. The cylindrical coordinate grid sacrifices some effi- ciency, but spans the critical separatrix region.
Other mandatory physics features (see Section II) include electromagnetic turbulence and fully kinetic ions. These simulation capabilities already exist in GTC using the magnetic coordinate grid. Development efforts will focus on porting GTC’s proven physics algorithms into ANC. Simultaneously, physics analysis can move forward using existing GTC features but restricted to simulation domains that do not cross the separatrix.
Beyond inclusion of fully kinetic ions, a cross-separatrix simulation domain, and electromagnetic perturbations, long term development goals include realistic end boundary con- ditions on open field lines, and the use of more general FRC equilibria which allow finite toroidal magnetic field. Code features from the new code, ANC, are also intended to be integrated into the GTC suite to produce a more robust, inte- grated physics code.
As mentioned in Section V, fully nonlinear simulations are required to quantitatively predict transport as well as to make direct comparison between simulation and experiment. The physics model used in both GTC and the newly devel- oped ANC is fundamentally nonlinear. Nonlinear physics will be investigated after the spectrum of linear modes is more thoroughly understood.
ACKNOWLEDGMENTS
This work was carried out as part of the author’s thesis work at University of California, Irvine, and continued at Tri Alpha Energy, Inc. Work at University of California was performed with the support of the Norman Rostoker Fellowship (Grant No. TAE-200441) and by the DOE SciDAC GSEP center. GTC simulations used resources on the Oak Ridge Leadership Computing Facility at Oak Ridge National Laboratory (DOE Contract No. DE-AC05-00OR22725), and the National Energy Research Scientific Computing Center (DOE Contract No. DE-AC02-05CH11231).
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