Code Description

Gem is a comprehensive electromagnetic gyrokinetic delta-f particle code that includes the full dynamics of gyrokinetic ions and drift-kinetic electrons. Magnetic perturbations perpendicular to the equilibrium field are fully modeled. The simulation is useful for studying well-magnetized plasma physics and is especially powerful because it is accurate at very-low fluctuation levels. Electron-ion collisions are included as well as the full-capability to model general axisymmetric toroidal equilibria.

Contact info: Yang Chen, 303-492-3664

Publications on Gem

Nonlinear saturation of collisionless trapped electron mode turbulence: zonal flows and zonal density. J. Lang, Y. Chen and S.E. Parker, to appear in Physics of Plasmas. pdf

Coarse-graining the electron distribution in turbulence simulations of tokamak plasmas. Y. Chen, S.E. Parker, G. Rewoldt, S. Ku, G.Y. Park and C-S Chang, submitted to Physics of Plasmas. pdf

Gyrokinetic delta-f particle simulation of trapped electron mode driven turbulence, J. Lang, Y. Chen and S. Parker, Physics of Plasmas 14, 082315 (2007). pdf

Coarse-graining phase space in delta-f particle-in-cell simulations, Y. Chen and S. Parker, Physics of Plasmas 14, 082301 (2007). pdf

Electromagnetic gyrokinetic delta-f particle-in-cell turbulence simulation with realistic equilibrium profiles and geometry, Y. Chen and S. Parker, J. of Comp. Phys. 220 839 (2007). pdf

Fine-scale zonal flow suppression of electron temperature gradient turbulence, S. Parker, J. Kohut, Y. Chen, Z. Lin, F. Hinton, W. Lee, AIP Conference Proceedings 871 193-203 (2006). pdf

Arbitrary plasma shape and trapped electron modes in the GEM gyrokinetic electromagnetic turbulence simulation code, Y. Chen, S. Parker, J. Lang, Journal of Physics: Conference Series 46 92-96 (2006). pdf

Relevance of the parallel nonlinearity in gyrokinetic simulations of tokamak plasmas, J. Candy, R. Waltz, S. Parker, Y. Chen, Phys. Plasmas 13 074501 (2006). pdf

Gyrokinetic delta-f simulation of the collisionless and semicollisonal tearing mode instability, W. Wan, Y. Chen and S. Parker, Phys. Plasmas 12 012311-1 (2005). pdf

Electromagnetic gyrokinetic simulations, S. Parker, Y. Chen and W. Wan, Phys. Plasmas 11 2494 (2004). pdf

A delta-f method for gyrokinetic simulations with kinetic electrons and electromagnetic perturbuations, Y. Chen and S. Parker, J. Comput. Phys. 189 463 (2003). pdf

Simulations of turbulent transport with kinetic electrons and electromagnetic effects, Y. Chen, S. Parker, B. Cohen, A. Dimits, W. Nevins, D. Shumaker, V. Decyk and J. Leboeuf, Nucl. Fusion 43 1121 (2003). pdf

Gyrokinetic simulations with kinetic electrons, Y. Chen and S. Parker, Phys. Plasmas 8 2095 (2001). pdf

Related Publications

The particle-continuum method: an algorithmic unification of particle-in-cell and continuum methods, S. Vadlamani, S. Parker, Y. Chen and C. Kim, Comp. Phys. Comm., 164 209 (2004). pdf

A gyrokinetic ion zero electron inertia fluid electron model for turbulence simulations, Y. Chen and S. Parker, Phys. Plasmas 8 441 (2001). pdf

Electromagnetic gyrokinetic ion drift-fluid-electron hybrid simulation, S. Parker, Y. Chen and C. Kim, Comp. Phys. Comm. Phs. 127 59 (2000).

Large-scale gyrokinetic turbulence simulations: Effects of profile variation, S. Parker, C. Kim and Y. Chen, Phys. Plasmas 6 1709 (1999). pdf