59 citations · 243 across the 15 of their papers we have counts for
17 papers
AI-Accelerated Gyrokinetic Predictions of Turbulent Transport for Stellarator Design Optimization and Experimental Planning
R. Michael Churchill, Matt Landreman, Jong Youl Choi +10
Previous work built AI-based surrogates for a nonlinear gyrokinetic simulation code with the goal of using them for fast, direct calculations of turbulent ion heat flux in stellara…
Saturation of magnetised plasma turbulence by propagating zonal flows
Richard Nies, Felix Parra, Michael Barnes +2
Strongly driven ion-scale turbulence in tokamak plasmas is shown to be regulated by a new propagating zonal flow mode, the toroidal secondary mode, which is nonlinearly supported b…
Optimization of Nonlinear Turbulence in Stellarators
Patrick Kim, Stefan Buller, Rory Conlin +8
We present new stellarator equilibria that have been optimized for reduced turbulent transport using nonlinear gyrokinetic simulations within the optimization loop. The optimizatio…
Towards continuum gyrokinetic study of high-field mirrors
Manaure Francisquez, Maxwell H. Rosen, Noah R. Mandell +3
High-temperature superconducting (HTS) magnetic mirrors under development exploit strong fields with high mirror ratio to compress loss cones and enhance confinement, and may offer…
Direct Microstability Optimization of Stellarator Devices
R. Jorge, W. Dorland, P. Kim +4
Turbulent transport is regarded as one of the key issues in magnetic confinement nuclear fusion, both for tokamaks in stellarators. In this work, we show that a significant decreas…
GX: a GPU-native gyrokinetic turbulence code for tokamak and stellarator design
N. R. Mandell, W. Dorland, I. Abel +4
GX is a code for solving the nonlinear gyrokinetic system for low-frequency turbulence in magnetized plasmas, particularly tokamaks and stellarators. In GX, our primary motivation…
Kinetic modeling of neutral transport for a continuum gyrokinetic code
T. N. Bernard, F. D. Halpern, M. Francisquez +6
We present the first-of-its-kind coupling of a continuum full-f gyrokinetic turbulence model with a 6D continuum model for kinetic neutrals, carried out using the Gkeyll code. Our…
Reduction of transport due to magnetic shear in gyrokinetic simulations of the scrape-off layer
N. R. Mandell, G. W. Hammett, A. Hakim +1
The effect of varying magnetic shear on scrape-off layer turbulence and profiles is studied via electromagnetic gyrokinetic simulations of a helical scrape-off layer model. We deve…
Turbulent broadening of electron heat-flux width in electromagnetic gyrokinetic simulations of a helical scrape-off layer model
N. R. Mandell, G. W. Hammett, A. Hakim +1
We demonstrate that cross-field transport in the scrape-off layer (SOL) can be moderately increased by electromagnetic effects in high-beta regimes, resulting in a broader electron…
Mapped discontinuous Galerkin interpolations and sheared boundary conditions
Manaure Francisquez, Noah R. Mandell, Ammar Hakim +1
Translations or, more generally, coordinate transformations of scalar fields arise in several applications, such as weather, accretion disk and magnetized plasma turbulence modelin…
Turbulent field fluctuations in gyrokinetic and fluid plasmas
Abhilash Mathews, Noah Mandell, Manaure Francisquez +2
A key uncertainty in the design and development of magnetic confinement fusion energy reactors is predicting edge plasma turbulence. An essential step in overcoming this uncertaint…
Magnetic Fluctuations in Gyrokinetic Simulations of Tokamak Scrape-Off Layer Turbulence
Noah Mandell
Understanding turbulent transport physics in the tokamak edge and scrape-off layer (SOL) is critical to developing a successful fusion reactor. The dynamics in these regions plays…
Conservative discontinuous Galerkin scheme of a gyro-averaged Dougherty collision operator
Manaure Francisquez, Tess N. Bernard, Noah R. Mandell +2
A conservative discontinuous Galerkin scheme for a nonlinear Dougherty collision operator in full-f long-wavelength gyrokinetics is presented. Analytically this model operator has…
Electromagnetic full- gyrokinetics in the tokamak edge with discontinuous Galerkin methods
N. R. Mandell, A. Hakim, G. W. Hammett +1
We present an energy-conserving discontinuous Galerkin scheme for the full- electromagnetic gyrokinetic system in the long-wavelength limit. We use the symplectic formulation an…
The Parallel Boundary Condition for Turbulence Simulations in Low Magnetic Shear Devices
Mike F. Martin, Matt Landreman, Pavlos Xanthopoulos +2
Flux tube simulations of plasma turbulence in stellarators and tokamaks typically employ coordinates which are aligned with the magnetic field lines. Anisotropic turbulent fluctuat…
Laguerre-Hermite Pseudo-Spectral Velocity Formulation of Gyrokinetics
N. R. Mandell, W. Dorland, M. Landreman
First-principles simulations of tokamak turbulence have proven to be of great value in recent decades. We develop a pseudo-spectral velocity formulation of the turbulence equations…
Optimisation of confinement in a fusion reactor using a nonlinear turbulence model
E. G. Highcock, N. R. Mandell, M. Barnes +1
The confinement of heat in the core of a magnetic fusion reactor is optimised using a multidimensional optimisation algorithm. For the first time in such a study, the loss of heat…