55 citations · 373 across the 22 of their papers we have counts for
22 papers
Observation of axisymmetric standard magnetorotational instability in the laboratory
Yin Wang, Erik P. Gilson, Fatima Ebrahimi +2
We report the first direct evidence for the axisymmetric standard magnetorotational instability (SMRI) from a combined experimental and numerical study of a magnetized liquid-metal…
A non-local magneto-curvature instability in a differentially rotating disk
Fatima Ebrahimi, Matthew Pharr
A global mode is shown to be unstable to non-axisymmetric perturbations in a differentially rotating Keplerian disk containing either vertical or azimuthal magnetic fields. In an u…
Plasmoids formation during simulations of coaxial helicity injection in the National Spherical Torus Experiment
F. Ebrahimi, R. Raman
Formation of an elongated Sweet-Parker current sheet and a transition to plasmoid instability has for the first time been predicted by simulations in a large-scale toroidal fusion…
Plasmoid-mediated reconnection during nonlinear peeling-ballooning edge-localized modes
Fatima Ebrahimi
Plasmoid-mediated reconnection is investigated for nonlinear Peeling-Ballooning Edge-Localized Modes (P-B ELMs). The formation of current sheets and the transition to 3-D current s…
Onset of Plasmoid Reconnection during Magnetorotational Instability
Jarrett Rosenberg, Fatima Ebrahimi
The evolution of current sheets in accretion flows undergoing magnetorotational instability (MRI) is examined through two and three dimensional numerical modelling of the resistive…
Importance of theory, computation and predictive modeling in the US magnetic fusion energy strategic plan
Fatima Ebrahimi, Gary Staebler, Paul Bonoli +5
Based on the community input at the National Academy of Sciences (NAS) Madison and Austin workshops in July and December 2017, respectively, this whitepaper was prepared and submit…
Turbulence and order in magnetized flowing plasmas
Fatima Ebrahimi, Eric Blackman, Wendell Horton
This whitepaper was submitted to the 2019-2020 APS-DPP-CPP (American Physical Society Division of Plasma Physics Community Planning Process) on plasma discovery science. It highlig…
An Alfvenic reconnecting plasmoid thruster
Fatima Ebrahimi
A new concept for generation of thrust for space propulsion is introduced. Energetic thrust is generated in the form of plasmoids (confined plasma in closed magnetic loops) when ma…
Major Scientific Challenges and Opportunities in Understanding Magnetic Reconnection and Related Explosive Phenomena in Solar and Heliospheric Plasmas
H. Ji, J. Karpen, A. Alt +105
Magnetic reconnection underlies many explosive phenomena in the heliosphere and in laboratory plasmas. The new research capabilities in theory/simulations, observations, and labora…
Major Scientific Challenges and Opportunities in Understanding Magnetic Reconnection and Related Explosive Phenomena throughout the Universe
H. Ji, A. Alt, S. Antiochos +97
This white paper summarizes major scientific challenges and opportunities in understanding magnetic reconnection and related explosive phenomena as a fundamental plasma process.
Stepped pressure equilibrium with relaxed flow and applications in reversed-field pinch plasmas
Z. S. Qu, R. L. Dewar, F. Ebrahimi +3
The Multi-region Relaxed MHD (MRxMHD) has been successful in the construction of equilibria in three-dimensional (3D) configurations. In MRxMHD, the plasma is sliced into sub-volum…
Minimalist large scale dynamo from shear-driven inhomogeneity
F. Ebrahimi, E. G. Blackman
We show that non-axisymmetric, non-helical perturbations in an unstratified shear flow produce a shear-plane averaged electromotive force (EMF) proportional to a spatially dependen…
Nonlinear reconnecting edge localized modes in tokamaks
F. Ebrahimi
Nonlinear edge localized modes in a tokamak are examined using global three-dimensional resistive magnetohydrodynamics simulations. Coherent current-carrying filament (ribbon-like)…
Numerical simulations of the Princeton magneto-rotational instability experiment with conducting axial boundaries
Xing Wei, Hantao Ji, Jeremy Goodman +4
We investigate numerically the Princeton magneto-rotational instability (MRI) experiment and the effect of conducting axial boundaries or endcaps. MRI is identified and found to re…
Dynamo-driven plasmoid formation from a current-sheet instability
F. Ebrahimi
Axisymmetric current-carrying plasmoids are formed in the presence of nonaxisymmetric fluctuations during nonlinear three-dimensional resistive MHD simulations in a global toroidal…
Evolution of the magnetorotational instability on initially tangled magnetic fields
Pallavi Bhat, Fatima Ebrahimi, Eric G. Blackman +1
The initial magnetic field of previous magnetorotational instability (MRI) simulations has always included a significant system-scale component, even if stochastic. However, it is…
Large scale dynamo action precedes turbulence in shearing box simulations of the magnetorotational instability
Pallavi Bhat, Fatima Ebrahimi, Eric G. Blackman
We study the dynamo generation (exponential growth) of large scale (planar averaged) fields in unstratified shearing box simulations of the magnetorotational instability (MRI). In…
Radially Dependent Large Scale Dynamos in Global Cylindrical Shear Flows and the Local Cartesian Limit
F. Ebrahimi, E. G. Blackman
For cylindrical differentially rotating plasmas, we study large-scale magnetic field generation from finite amplitude non-axisymmetric perturbations by comparing numerical simulati…
Helicity-Flux-Driven Alpha Effect in Laboratory and Astrophysical Plasmas
F. Ebrahimi, A. Bhattacharjee
The constraint imposed by magnetic helicity conservation on the alpha effect is considered for both magnetically and flow dominated self-organizing plasmas. Direct numerical simula…
Momentum transport from current-driven reconnection in astrophysical disks
F. Ebrahimi, S. C. Prager
Current-driven reconnection is investigated as a possible mechanism for angular momentum transport in astrophysical disks. A theoretical and computational study of angular momentum…
Minimum energy states of the plasma pinch in standard and Hall magnetohydrodynamics
I. V. Khalzov, F. Ebrahimi, D. D. Schnack +1
Axisymmetric relaxed states of a cylindrical plasma column are found analytically in both standard and Hall magnetohydrodynamics (MHD) by complete minimization of energy with const…
Saturation of Magnetorotational Instability through Magnetic Field Generation
F. Ebrahimi, S. C. Prager, D. D. Schnack
The saturation mechanism of Magneto-Rotational Instability (MRI) is examined through analytical quasilinear theory and through nonlinear computation of a single mode in a rotating…