Code Description

Yang Chen, Scott Parker

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.

 

Publications on GEM

  • An Implicit δf Particle-in-Cell Method with Sub-Cycling and Orbit Averaging for Lorentz Ions, B. J. Sturdevant, S. E. Parker, Y. Chen and B. B. Hause, J. Comp. Phys. (to appear, 2016) pdf
  • Gyrokinetic-ion drift-kinetic-electron simulation of the (m = 2, n = 1) cylindrical tearing mode, Y. Chen, J. Chowdhury, N. Maksimovic, S. E. Parker and W. Wan, Phys. Plasmas 23, 056101 (2016)pdf
  • Particle-in-cell δf gyrokinetic simulations of the micro tearing mode, J. Chowdhury, Y. Chen, W. Wan, S. E. Parker, W. Guttenfelder and J. M. Canik, Phys. Plasmas 23, 012513 (2016) pdf
  • Finite time step and spatial grid effects in δ f simulation of warm plasmas, B. J. Sturdevant and S. E. Parker, J. Comp. Phys. 305 (2016) 647–663 pdf
  • Finite Larmor radius effects on the (m = 2, n = 1) cylindrical tearing mode, Y. Chen, J. Chowdhury, S. E. Parker and W. Wan, Phys. Plasmas 22, 042111 (2015) pdf
  • Spatially resolved measurements of two-dimensional turbulent structures in DIII-D plasmas, S. E. Zemedkun, S. Che, Y. Chen, C. W. Domier, N. C. Luhmann, Jr., T. Munsat, S. E. Parker, B. Tobias, W. Wan, and L. Yu, Phys. Plasmas 22, 122508 (2015) pdf
  • Effects of the magnetic equilibrium on gyrokinetic simulations of tokamak micro instabilities, W. Wan, Y. Chen, S. E. Parker and R. J. Groebner, Phys. Plasmas 22, 062502 (2015) pdf
  • Study of the L-mode tokamak plasma “shortfall” with local and global nonlinear gyrokinetic df particle-in-cell simulation, J. Chowdhury, Weigang Wan,Yang Chen, Scott E. Parker, Richard J. Groebner,C. Holland, and N. T. Howard, Phys. Plasmas 21, 112503 (2014) pdf
  • Benchmarking gyrokinetic simulations in a toroidal flux-tube, Y. Chen, S. E. Parker, W. Wan and R. Bravenec Phys. Plasmas20, 092511 (2013) pdf
  • A verification of the gyrokinetic microstability codes GEM, GYRO, and GS2, R. V. Bravenec, Y. Chen, J. Candy, W. Wan and S. Parker, Phys. Plasmas 20, 104506 (2013) pdf
  • Measurements and simulations of low-wavenumber pedestal turbulence in the National Spherical Torus Experiment, D.R. Smith, S.E. Parker, W. Wan, Y. Chen, A. Diallo, B.D. Dudson, R.J. Fonck, W. Guttenfelder, G.R. McKee and S.M. Kaye, Nucl. Fusion 53, 1123029 (2013) pdf
  • A second-order semi-implicit df method for hybrid simulation, Jianhua Cheng, Scott E. Parker, Yang Chen, Dmitri A. Uzdensky, Journal of Computational Physics 245 (2013) 364–375 pdf
  • Global gyrokinetic simulations of the H-mode tokamak edge pedestal, W. Wan, S. E. Parker, Y. Chen, R. J. Groebner, Z. Yan, A. Y. Pankin, and S. E. Kruger, Phys. Plasmas 20, 055902 (2013) pdf
  • Comparison of Kinetic and Extended MHD Computational Models for the Linear Ion Temperature Gradient Instability in Slab Geometry, D. D. Schnack, J. Cheng, D. Barnes and S. Parker, Phys. Plasmas 20, 062106 (2013) pdf
  • Gyrokinetic simulations of reverse shear Alfvén eigenmodes in DIII-D plasmas, Y. Chen, T. Munsat, S. E. Parker, W. W. Heidbrink, M. A. Van Zeeland, B. J. Tobias, and C. W. Domier, Phys. Plasmas 20, 012109 (2013) pdf
  • Linear gyrokinetic analysis of a DIII-D H-mode pedestal near the ideal ballooning threshold, E. Wang, X. Xu, J. Candy, R. J. Groebner, P. B. Snyder, Y. Chen, S. E. Parker, W. Wan, G. Lu , and J. Q. Dong, Nucl. Fusion 52, 103015 (2012) pdf
  • Global Gyrokinetic Simulation of Tokamak Edge Pedestal Instabilities, W. Wan, S. E. Parker, Y. Chen, Z. Yan, R. J. Groebner, and P. B. Snyder, Phys. Rev. Lett. 109, 185004 (2012) pdf
  • The pinch of cold ions from recycling in the tokamak edge pedestal, W. Wan, S. E. Parker, Y. Chen, G.-Y. Park, C.-S. Chang, and D. Stotler, Phys. Plasmas 18, 056116 (2011) pdf
  • Fluid electrons with kinetic closure for long wavelength energetic particles driven modes, Y. Chen and S. E. Parker, Phys. Plasmas 18, 055703 (2011) pdf
  • L-mode validation studies of gyrokinteic turbulence simulations via multiscale and multifield turbulence measurements on the DIII-D tokamak, T.L. Rhodes, C. Holland, S.P. Smith, A.E. White, K.H. Burrell, J. Candy, J.C. DeBoo, E.J. Doyle, J.C. Hillesheim, J.E. Kinsey, G.R. McKee, D. Mikkelsen, W.A. Peebles, C.C. Petty, R. Prater, S. Parker, Y. Chen, L. Schmitz, G.M. Staebler, R.E. Waltz, G. Wang, Z. Yan and L. Zeng, Nucl. Fusion 51, 063022 (2011) pdf
  • Linear gyrokinetic simulation of high-n toroidal Alfvén eigenmodes in a burning plasma, Y. Chen, S. E. Parker, J. Lang and G.-Y. Fu, Phys. Plasmas 17, 102504 (2010) pdf
  • Natural fueling of a tokamak fusion reactor, W. Wan, S. E. Parker, Y. Chen and F.W. Perkins, Phys. Plasmas 17, 040701 (2010) pdf
  • Gyrokinetic delta-f particle simulations of toroidicity-induced Alfvén eigenmode, J. Lang, Y. Chen, S. E. Parker, and G.-Y. Fu, Phys. Plasmas 16, 102101 (2009) pdf
  • Particle-in-Cell simulation with Vlasov ions and drift-kinetic electrons, Y. Chen & S. E. Parker, Phys. Plasmas 16, 052305 (2009) pdf
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  • Role of zonal flows in TEM turbulence through nonlinear gyrokinetic particle and continuum simulation, D.R. Ernst, J. Lang, W. Nevins, M. Hoffman, Y. Chen, W. Dorland and S. Parker,  Phys. Plasmas 16, 055906 (2009) (pdf)
  • Low-noise particle algorithms for extended magnetohydrodynamic closure, D.C. Barnes, J. Cheng and S. E. Parker, Phys. Plasmas 15, 055702 (2008) pdf
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  • Nonlinear saturation of  collisionless trapped electron mode turbulence: zonal flows and zonal  density, J. Lang, Y. Chen and S. E. Parker, Phys. Plasmas 15, 055907 (2008) (pdf)
  • Coarse-graining the electron distribution in turbulence simulations of tokamak plasmas, Y. Chen, S. E. Parker, G. Rewoldt, S. Ku, G. Y. Park & C-S. Chang, Phys. Plasmas 15, 055905 (2008) (pdf)
  • Verification of gyrokinetic delta-f simulations of electron temperature gradient turbulence, B. Nevins, Y. Chen and S. E. Parker, Physics of Plasmas 14, 084501 (2007) (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 4692-96 (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 2594 (2004). pdf
  • 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 delta-f particle 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
  • 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). pdf
  • Large-scale gyrokinetic turbulence simulations: Effects of profile variation, S. Parker, C. Kim and Y. Chen, Phys. Plasmas 6 1709 (1999). pdf