326 citations · 1.4k across the 33 of their papers we have counts for
24 papers · 1 filter
Three-Dimensional Particle-In-Cell Simulations of Two-Dimensional Bernstein-Greene-Kruskal Modes
M. T. Franciscovich, J. McClung, K. Germaschewski +1
In this paper, we present three-dimensional (3D) Particle-In-Cell (PIC) simulations to study the stability of 2D Bernstein-Greene-Kruskal (BGK) modes in a magnetized plasma with a…
On the Effect of Driving Turbulent-like Fluctuations on a Harris-Current Sheet Configuration and the Formation of Plasmoids
Jeffersson Andres Agudelo Rueda, Yi-Hsin Liu, Kai Germaschewski +2
Energy dissipation in collisionless plasmas is one of the most outstanding open questions in plasma physics. Magnetic reconnection and turbulence are two phenomena that can produce…
High-Resolution Particle-In-Cell Simulations of Two-Dimensional Bernstein-Greene-Kruskal Modes
J. McClung, M. T. Franciscovich, K. Germaschewski +1
We present two dimensional (2D) particle-in-cell (PIC) simulations of 2D Bernstein-Greene-Kruskal (BGK) modes, which are exact nonlinear steady-state solutions of the Vlasov-Poisso…
Relating the Phases of Magnetic Reconnection Growth to the Temporal Evolution of X-line Structures in a Collisionless Plasma
D. S. Payne, R. B. Torbert, K. Germaschewski +2
The efficiency of energy conversion during magnetic reconnection is related to the reconnection rate. While the stable reconnection rate has been studied extensively, its growth be…
Energy transport during 3D small-scale reconnection driven by anisotropic plasma turbulence
Jeffersson A. Agudelo Rueda, Daniel Verscharen, Robert T. Wicks +6
Energy dissipation in collisionless plasmas is a longstanding fundamental physics problem. Although it is well known that magnetic reconnection and turbulence are coupled and trans…
In Search of a Data Driven Symbolic Multi-Fluid 10-Moment Model Closure
John Donaghy, Kai Germaschewski
The inclusion of kinetic effects into fluid models has been a long standing problem in magnetic reconnection and plasma physics. Generally the pressure tensor is reduced to a scala…
Global gyrokinetic simulations of ASDEX Upgrade up to the transport time-scale with GENE-Tango
A. Di Siena, A. Banon Navarro, T. Luda +12
An accurate description of turbulence up to the transport time scale is essential for predicting core plasma profiles and enabling reliable calculations for designing advanced scen…
A novel kinetic mechanism for the onset of fast magnetic reconnection and plasmoid instabilities in collisionless plasmas
W. Fox, G. Fiksel, D. B. Schaeffer +9
Magnetic reconnection can explosively release magnetic energy when opposing magnetic fields merge and annihilate through a current sheet, driving plasma jets and accelerating non-t…
Inference and De-Noising of Non-Gaussian Particle Distribution Functions: A Generative Modeling Approach
John Donaghy, Kai Germaschewski
The particle-in-cell numerical method of plasma physics balances a trade-off between computational cost and intrinsic noise. Inference on data produced by these simulations general…
Kinetic simulations of electron pre-energization by magnetized collisionless shocks in expanding laboratory plasmas
K. V. Lezhnin, W. Fox, D. B. Schaeffer +4
Collisionless shocks are common features in space and astrophysical systems where supersonic plasma flows interact, such as in the solar wind, the heliopause, and supernova remnant…
Weibel instability drives large magnetic field generation in laser-driven single plume ablation
Jackson Matteucci, Will Fox, Amitava Bhattacharjee +6
First-principles kinetic simulations are used to investigate magnetic field generation processes in expanding ablated plasmas relevant to laser-driven foils and hohlraums. In addit…
Particle Velocity Distributions in Developing Magnetized Collisionless Shocks in Laser-Produced Plasmas
D. B. Schaeffer, W. Fox, R. K. Follett +5
We present the first laboratory observations of time-resolved electron and ion velocity distributions in forming, magnetized collisionless shocks. Thomson scattering of a probe las…
Regimes of magnetic reconnection in colliding laser-produced magnetized plasma bubbles
K. V. Lezhnin, W. Fox, J. Matteucci +4
We conduct a multiparametric study of driven magnetic reconnection relevant to recent experiments on colliding magnetized laser produced plasmas using particle-in-cell simulations.…
Biermann battery-mediated magnetic reconnection in 3-D colliding plasmas
Jackson Matteucci, Will Fox, Amitava Bhattacharjee +5
Recent experiments have demonstrated magnetic reconnection between colliding plasma plumes, where the reconnecting magnetic fields were self-generated in the plasma by the Biermann…
Generation and Evolution of High-Mach Number, Laser-Driven Magnetized Collisionless Shocks in the Laboratory
Derek Schaeffer, Will Fox, Dan Haberberger +5
Shocks act to convert incoming supersonic flows to heat, and in collisionless plasmas the shock layer forms on kinetic plasma scales through collective electromagnetic effects. The…
Effects of electron temperature anisotropy on proton mirror instability evolution
Narges Ahmadi, Kai Germaschewski, Joachim Raeder
Proton mirror modes are large amplitude nonpropagating structures frequently observed in the magnetosheath. It has been suggested that electron temperature anisotropy can enhance t…
The island coalescence problem: scaling of reconnection in extended fluid models including higher-order moments
Jonathan Ng, Yi-Min Huang, Ammar Hakim +5
As modeling of collisionless magnetic reconnection in most space plasmas with realistic parameters is beyond the capability of today's simulations, due to the separation between gl…
Effect of electron diamagnetic drifts on cylindrical double-tearing modes
Stephen Abbott, Kai Germaschewski
Double-tearing modes (DTMs) have been proposed as a driver of `off-axis sawtooth' crashes in reverse magnetic shear tokamak configurations. Recently differential rotation provided…
Instability-Enhanced Friction in the Presheath of Two-Ion-Species Plasmas
Scott D. Baalrud, Trevor Lafleur, William Fox +1
The speed at which ions enter a sheath is a fundamental property of a plasma that also provides a useful boundary condition in modeling. A recent theory proposed that this can be s…
Comparison of multi-fluid moment models with Particle-in-Cell simulations of collisionless magnetic reconnection
Liang Wang, Ammar H. Hakim, A. Bhattacharjee +1
We introduce an extensible multi-fluid moment model in the context of collisionless magnetic reconnection. This model evolves full Maxwell equations, and simultaneously moments of…
Filamentation instability of counter-streaming laser-driven plasmas
W. Fox, G. Fiksel, A. Bhattacharjee +4
Filamentation due to the growth of a Weibel-type instability was observed in the interaction of a pair of counter-streaming, ablatively-driven plasma flows, in a supersonic, collis…
The Plasma Simulation Code: A modern particle-in-cell code with load-balancing and GPU support
Kai Germaschewski, William Fox, Stephen Abbott +5
Recent increases in supercomputing power, driven by the multi-core revolution and accelerators such as the IBM Cell processor, graphics processing units (GPUs) and Intel's Many Int…
Hall magnetohydrodynamic reconnection in the plasmoid unstable regime
S. D. Baalrud, A. Bhattacharjee, Y. -M. Huang +1
A set of reduced Hall magnetohydrodynamic (MHD) equations are used to evaluate the stability of large aspect ratio current sheets to the formation of plasmoids (secondary islands).…
Fast magnetic reconnection in laser-produced plasma bubbles
W. Fox, A. Bhattacharjee, K. Germaschewski
Recent experiments have observed magnetic reconnection in high-energy-density, laser-produced plasma bubbles, with reconnection rates observed to be much higher than can be explain…