87 citations · 409 across the 27 of their papers we have counts for
28 papers
An explicit multiscale pseudo orbit-averaging time integration algorithm
Maxwell H. Rosen, Manaure Francisquez, Gregory W. Hammett
We present an explicit multiscale algorithm for solving differential equations for problems with high-frequency modes that can be averaged over by separating and scaling the fast a…
High-throughput full-f gyrokinetics of the tokamak boundary
A. C. D. Hoffmann, M. Francisquez, T. N. Bernard +2
Full-f gyrokinetics of the tokamak boundary have so far been limited to individual, expert-curated cases. We report hundreds of concurrent and unsupervised simulations of the edge…
Gyrokinetic equilibria of high temperature superconducting magnetic mirrors
Maxwell H. Rosen, Manaure Francisquez, James Juno +3
High-temperature superconducting (HTS) magnets and other advances have led to renewed interest in magnetic mirrors for fusion energy. The non-Maxwellian nature of mirror plasmas ne…
Super Time Stepping Methods for Diffusion using Discontinuous-Galerkin Spatial Discretizations
Mustafa Aggul, Manaure Francisquez, Daniel R. Reynolds +1
Super-time-stepping (STS) methods provide an attractive approach for enabling explicit time integration of parabolic operators, particularly in large-scale, higher-dimensional kine…
Gyrokinetic Simulations of a Low Recycling Scrape-off Layer without a Lithium Target
Akash Shukla, Jonathan Roeltgen, Michael Kotschenreuther +7
Low-recycling regimes are appealing because they entail a high edge temperature and low edge density which are good for core confinement. However, due to considerably enhanced heat…
Constructing Field Aligned Coordinate Systems for Gyrokinetic Simulations of Tokamaks in X-point Geometries
Akash Shukla, Ammar Hakim, James Juno +2
Structures in tokamak plasmas are elongated along the direction of the magnetic field and short in the directions perpendicular to the magnetic field. Many tokamak simulation codes…
Towards fully predictive gyrokinetic full-f simulations: validation and triangularity studies in TCV
A. C. D. Hoffmann, T. N. Bernard, M. Francisquez +6
Designing economical magnetic confinement fusion power plants motivates computational tools that can estimate plasma behavior from engineering parameters without direct reliance on…
Axisymmetric Gyrokinetic Simulation of ASDEX-Upgrade Scrape-off Layer Using a Conservative Implicit BGK Collision Operator
D. Liu, J. Juno, G. W. Hammett +3
Collisions play an important role in turbulence and transport of fusion plasmas. For kinetic simulations, as the collisionality increases in the domain of interest, the size of the…
Conservative velocity mappings for discontinuous Galerkin kinetics
Manaure Francisquez, Petr Cagas, Akash Shukla +2
Continuum computational kinetic plasma models evolve the distribution function of a plasma species on a phase-space grid over time. In many problems of interest the distribut…
Direct Comparison of Gyrokinetic and Fluid Scrape-Off Layer Simulations
A. Shukla, J. Roeltgen, M. Kotschenreuther +7
Typically, fluid simulations are used for tokamak divertor design. However, fluid models are only valid if the SOL is highly collisional, an assumption that is valid in many presen…
General kinetic ion induced electron emission model for metallic walls applied to biased Z-pinch electrodes
Chirag R. Skolar, Kolter Bradshaw, Manaure Francisquez +3
A kinetic ion induced electron emission (IIEE) model for general applications is developed to obtain the emitted electron energy spectrum for a distribution of ion impacts on a met…
A Two-dimensional Numerical Study of Ion-Acoustic Turbulence
Zhuo Liu, Ryan White, Lucio M. Milanese +1
We investigate the linear and nonlinear evolution of the ion-acoustic instability in a collisionless plasma via two-dimensional (2D2V) Vlasov-Poisson numerical simulations. We init…
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…
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…
Improved multispecies Dougherty collisions
Manaure Francisquez, James Juno, Ammar Hakim +2
The Dougherty model Fokker-Planck operator is extended to describe nonlinear full-f collisions between multiple species in plasmas. Simple relations for cross-species interactions…
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…
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…
Uncovering turbulent plasma dynamics via deep learning from partial observations
Abhilash Mathews, Manaure Francisquez, Jerry Hughes +3
One of the most intensely studied aspects of magnetic confinement fusion is edge plasma turbulence which is critical to reactor performance and operation. Drift-reduced Braginskii…
Generalized slab universal instability and its appearance in pair plasma
Ben Zhu, Manaure Francisquez, Barrett N. Rogers +1
A generalized linear dispersion relation of electromagnetic slab universal modes is derived, taking into account arbitrary ion charge state, electron finite Larmor radius (FLR) eff…
Fluid & Gyrokinetic turbulence in open field-line, helical plasmas
Manaure Francisquez, Tess N. Bernard, Ben Zhu +3
Two-fluid Braginskii codes have simulated open-field line turbulence for over a decade, and only recently has it become possible to study these systems with continuum gyrokinetic c…
Dynamo in weakly collisional nonmagnetized plasmas impeded by Landau damping of magnetic fields
István Pusztai, James Juno, Axel Brandenburg +4
We perform fully kinetic simulations of flows known to produce dynamo in magnetohydrodynamics (MHD), considering scenarios with low Reynolds number and high magnetic Prandtl number…