Comparisons and Physics Basis of Tokamak Transport Models and Turbulence Simulations (2007)
Dimits Beer Hammett, A. M. Dimits, M. A. Beer, G. W. Hammett, S. E. Parker, A. J. Redd, ...
The predictions of gyrokinetic and gyrofluid simulations of ion-temperature-gradient (ITG) instability and turbulence in tokamak plasmas as well as some tokamak plasma thermal transport models, which...
Atomic Physics Effects on Dissipative Toroidal Drift Wave Stability (2007)
The effects of atomic physics processes such as ionization, charge exchange, and radiation on the linear stability of dissipative drift waves are investigated in toroidal geometry both numerically...
M. Kotschenreuther, W. Dorl, M. A. Beer, G. W. Hammett
A first-principles model of anomalous thermal transport based on numerical simulations is presented, with stringent comparisons to experimental data from the Tokamak Fusion Test Reactor (TFTR)...
W. Dorl, M. Kotschenreuther, M. A. Beer, G. W. Hammett, R. E. Waltz, R. R. Dominguez, ...
The anomalously large thermal transport observed in tokamak experiments is the outstanding physics-based obstacle in the path to a commercially viable fusion reactor. Although decades of experimental...
Bounce averaged trapped electron fluid equations for (2007)
plasma turbulence
M. A. Beer, G. W. Hammett, G. Rewoldt, E. J. Synakowski, M. C. Zarnstorff, W. Dorland
The confinement improvement in reversed-shear experiments on the Tokamak Fusion Test Reactor [Plasma Phys. Controlled Fusion 26, 11 (1984)] is investigated using nonlinear gyrofluid simulations...
G. W. Hammett, M. A. Beer, J. C. Cummings, W. Dorl, M. Artun, H. P. Furth, ...
Much progress has been made in simulating tokamak turbulent transport using both gyrofluid and gyrokinetic particle techniques. Recent simulations have focused on Ion Temperature Gradient (ITG)...
Gyrokinetic Simulations of Tokamak Microturbulence (2001)
Dorland, W., Rogers, B.N., Jenko, F., Kotschenreuther, M., Hammett, G.W., Mikkelsen, D.R., ...
The Dynamics of Small-Scale TurbulenceDriven Flows", to be published (1998)
We investigate the dynamics of small-scale turbulence-driven sheared E \Theta B flows in nonlinear gyrofluid simulations. The importance of these zonal flows in the regulation of the turbulence was...
Toroidal Gyrofluid Equations for Simulations of Tokamak Turbulence (1996)
A set of nonlinear gyrofluid equations for simulations of tokamak turbulence are derived by taking moments of the nonlinear toroidal gyrokinetic equation. The moment hierarchy is closed with...
M. A. Beer, S. C. Cowley, G. W. Hammett
Turbulence in tokamaks is characterized by long parallel wavelengths and short perpendicular wavelengths. A coordinate system for nonlinear fluid, gyrokinetic "Vlasov, " or particle...