6 papers
Radial transport of electric current by electromagnetic microturbulence in tokamaks
Haomin Sun, Toby Adkins, Justin Ball +1
The turbulent transport of toroidal angular momentum helps determine the rotation profiles of tokamak plasmas, and thereby their confinement and stability. The electron contributio…
Destabilization of temperature-gradient-driven plasma turbulence by equilibrium flow shear
Haomin Sun, Plamen G. Ivanov, Justin Ball +2
The paper shows that an imposed equilibrium E×B flow shear can destroy self‑generated zonal flows in temperature‑gradient‑driven plasma turbulence, causing a sharp rise in transpor…
Intrinsic momentum transport driven by almost-rational surfaces in tokamak plasmas
Justin Ball, Arnas Volcokas, Stephan Brunner
We demonstrate that a symmetry of the local gyrokinetic model is broken when the safety factor q is almost (but not exactly) a rational number and magnetic shear is $\hat{s} \appro…
Effect of radial pressure corrugations and profile shearing on turbulence in Fusion plasmas
Ajay C. J, M. J. Pueschel, Justin Ball +3
Microturbulence can produce stationary fine-scale radial corrugations on the plasma density and temperature gradients in magnetic confinement fusion devices. We show that these str…
Reducing turbulent transport in tokamaks by combining intrinsic rotation and the low momentum diffusivity regime
Haomin Sun, Justin Ball, Stephan Brunner +8
Based on the analysis of a large number of high-fidelity nonlinear gyrokinetic simulations, we propose a novel strategy to improve confinement in spherical tokamak plasmas by combi…
Turbulence-Generated Stepped Safety Factor Profiles in Tokamaks with Low Magnetic Shear
Arnas VolÄokas, Justin Ball, Giovanni Di Giannatale +1
Nonlinear local and global gyrokinetic simulations of tokamak plasmas demonstrate that turbulence-generated currents flatten the safety factor profile near low-order rational surfa…