72 citations · 303 across the 13 of their papers we have counts for
13 papers
How does ion temperature gradient turbulence depend on magnetic geometry? Insights from data and machine learning
Matt Landreman, Jong Youl Choi, Caio Alves +4
Magnetic geometry has a significant effect on the level of turbulent transport in fusion plasmas. Here, we model and analyze this dependence using multiple machine learning methods…
Zonal flow suppression of turbulent transport in the optimized stellarators W7-X and QSTK
Abhishek Tiwari, Joydeep Das, Jaya Kumar Alageshan +6
We present a comparative study of transport in two optimized stellarator configurations: Wendelstein 7-X (W7-X) and a recent design called Quasi-Symmetric Turbulence Konzept (QSTK)…
Quasi-isodynamic stellarators with low turbulence as fusion reactor candidates
Alan G. Goodman, Pavlos Xanthopoulos, Gabriel G. Plunk +7
The stellarator is a type of fusion energy device that - if properly designed - could provide clean, safe, and abundant energy to the grid. To generate this energy, a stellarator m…
Assessing global ion thermal confinement in critical-gradient-optimized stellarators
A. Bañón Navarro, G. T. Roberg-Clark, G. G. Plunk +4
We investigate the confinement properties of two recently devised quasi-helically symmetric stellarator configurations, HSK and QSTK. Both have been optimized for large critical gr…
Critical gradient turbulence optimization toward a compact stellarator reactor concept
G. T. Roberg-Clark, G. G. Plunk, P. Xanthopoulos +3
Integrating turbulence into stellarator optimization is shown by targeting the onset for the ion-temperature-gradient mode, highlighting effects of parallel connection length, loca…
Reduction of electrostatic turbulence in a quasi-helically symmetric stellarator via critical gradient optimization
G. T. Roberg-Clark, P. Xanthopoulos, G. G. Plunk
We present a stellarator configuration optimized for a large threshold (``critical gradient'') for the onset of the ion temperature gradient (ITG) driven mode, which achieves the l…
Coarse-grained gyrokinetics for the critical ion temperature gradient in stellarators
G. T. Roberg-Clark, G. G. Plunk, P. Xanthopoulos
We present a modified gyrokinetic theory to predict the critical gradient that determines the linear onset of the ion temperature gradient (ITG) mode in stellarator plasmas. A coar…
Calculating the linear critical gradient for the ion-temperature-gradient mode in magnetically confined plasmas
G. T. Roberg-Clark, G. G. Plunk, P. Xanthopoulos
A first-principles method to calculate the critical temperature gradient for the onset of the ion-temperature-gradient mode (ITG) in linear gyrokinetics is presented. We find that…
Whistler-regulated MHD: Transport equations for electron thermal conduction in the high intracluster medium of galaxy clusters
J. F. Drake, C. Pfrommer, C. S. Reynolds +6
Transport equations for electron thermal energy in the high intracluster medium (ICM) are developed that include scattering from both classical collisions and self-generated…
Scattering of energetic electrons by heat-flux-driven whistlers in flares
G. T. Roberg-Clark, O. V. Agapitov, J. F. Drake +1
The scattering of electrons by heat-flux-driven whistler waves is explored with a particle-in-cell (PIC) simulation relevant to the transport of energetic electrons in flares. The…
Wave generation and heat flux suppression in astrophysical plasma systems
G. T. Roberg-Clark, J. F. Drake, M. Swisdak +1
Heat flux suppression in collisionless plasmas for a large range of plasma is explored using two-dimensional particle-in-cell simulations with a strong, sustained thermal gradi…
Suppression of electron thermal conduction by whistler turbulence in a sustained thermal gradient
G. T. Roberg-Clark, J. F. Drake, C. S. Reynolds +1
The dynamics of weakly magnetized collisionless plasmas in the presence of an imposed temperature gradient along an ambient magnetic field is explored with particle-in-cell simulat…
Suppression of electron thermal conduction in the high intracluster medium of galaxy clusters
G. T. Roberg-Clark, J. F. Drake, C. S. Reynolds +1
Understanding the thermodynamic state of the hot intracluster medium (ICM) in a galaxy cluster requires a knowledge of the plasma transport processes, especially thermal conduction…