64 citations · 161 across the 10 of their papers we have counts for
10 papers
Detecting Shearless Phase-Space Transport Barriers in Global Gyrokinetic Turbulence Simulations with Test Particle Map Models
Norman M. Cao, Hongxuan Zhu, Gabriel C. Grime +1
In magnetically confined fusion plasmas, the role played by zonal EB flow shear layers in the suppression of turbulent transport is relatively well-understood. However, les…
Intrinsic toroidal rotation driven by turbulent and neoclassical processes in tokamak plasmas from global gyrokinetic simulations
Hongxuan Zhu, T. Stoltzfus-Dueck, R. Hager +2
Gyrokinetic tokamak plasmas can exhibit intrinsic toroidal rotation driven by the residual stress. While most studies have attributed the residual stress to the parallel-momentum f…
Effects of collisional ion orbit loss on tokamak radial electric field and toroidal rotation in an L-mode plasma
Hongxuan Zhu, T. Stoltzfus-Dueck, R. Hager +2
Ion orbit loss has been used to model the formation of a strong negative radial electric field in the tokamak edge, as well as edge momentum transport and toroidal rotation.…
Effects of collisional ion orbit loss on neoclassical tokamak radial electric fields
Hongxuan Zhu, T. Stoltzfus-Dueck, R. Hager +2
Ion orbit loss is considered important for generating the radially inward electric field in a tokamak edge plasma. In particular, this effect is emphasized in diverted tokama…
Investigating shear flow through continuum gyrokinetic simulations of limiter biasing in the Texas Helimak
Tess N. Bernard, Timothy Stoltzfus-Dueck, Kenneth W. Gentle +3
Previous limiter-biasing experiments on the Texas Helimak, a simple magnetized torus, have been inconclusive on the effect of flow shear on turbulence levels. To investigate this,…
Gyrokinetic continuum simulations of plasma turbulence in the Texas Helimak
Tess N. Bernard, Eric L. Shi, Kenneth Gentle +4
The first gyrokinetic simulations of plasma turbulence in the Texas Helimak device, a simple magnetized torus, are presented. The device has features similar to the scrape-off laye…
Gyrokinetic continuum simulation of turbulence in a straight open-field-line plasma
E. L. Shi, G. W. Hammett, T. Stoltzfus-Dueck +1
3D2V continuum gyrokinetic simulations of electrostatic plasma turbulence in a straight, open-field-line geometry have been performed using the full- discontinuous-Galerkin code…
Parasitic Momentum Flux in the Tokamak Core
T. Stoltzfus-Dueck
A geometrical correction to the E x B drift causes an outward flux of cocurrent momentum whenever electrostatic potential energy is transferred to ion parallel flows. The robust sy…
Scrape-Off Layer Turbulence in Tokamaks Simulated with a Continuum Gyrokinetic Code
A. Hakim, E. L. Shi, I. G. Abel +2
We are developing a new continuum gyrokinetic code, Gkeyll, for use in edge plasma simulations, and here present initial simulations of turbulence on open field lines with model sh…
Transport-driven toroidal rotation in the tokamak edge
T. Stoltzfus-Dueck
The interaction of passing-ion drift orbits with spatially-inhomogeneous but purely diffusive radial transport is demonstrated to cause spontaneous toroidal spin-up to experimental…