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(TH/P1-13) Large-Scale Gyrokinetic Turbulence Simulations with Kinetic Electrons from the Summit Framework

S.E. Parker1), Y. Chen1), B.I. Cohen2), A.M. Dimits2), W.M. Nevins2), D. Shumaker2), V.K. Decyk3), J.N. Leboeuf3)
1) Department of Physics, University of Colorado, Boulder, Colorado, USA
2) Lawrence Livermore National Laboratory, Livermore, California, USA
3) Univ. of California, Los Angeles, California, USA

Abstract.   Results from gyrokinetic turbulence simulations including electromagnetic perturbations and kinetic electrons in three-dimensional toroidal geometry with realistic tokamak plasma parameters are reported. This model includes electron-ion collisions and has been well benchmarked in the linear limit. It is found that for H-mode parameters, kinetic electrons increase the linear ITG growth rate and there is a corresponding decrease in the critical ion temperature gradient due to trapped-electron drive. However, a nonlinear up-shift in the critical gradient or a super-critical region still persists. The linear behavior of the zonal flow is little affected by kinetic electrons. This work is being carried out using the ``Summit Framework." Progress on Summit, an open-source framework for both local and global, massively parallel gyrokinetic turbulence simulations with kinetic electrons and electromagnetic perturbations, is reported.

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IAEA 2003