64 papers
This paper presents a generalized theory of zonal flow growth in toroidal geometry, demonstrating that radial magnetic drifts drive a new propagating branch called the toroidal secondary mode and validating this framework against gyrokinetic simulations.
This paper demonstrates that strongly driven ion-scale turbulence in tokamak plasmas is regulated by a newly identified propagating zonal flow mode called the toroidal secondary mode, which nonlinearly shears turbulent eddies above a specific threshold to establish scaling laws for heat flux and fluctuation spectra that align with both simulations and experimental observations.
This paper demonstrates the application of the Sparse Identification of Nonlinear Dynamics (SINDy) method with a weak formulation to accurately identify effective microparticle interaction potentials from noisy simulation data, offering a promising approach for analyzing experimental dusty plasma systems like the PK-4 experiment.
This paper systematically investigates the propagation and collisional absorption of normally incident laser light in strongly magnetized inhomogeneous plasma, revealing that while left-hand circularly polarized waves reflect at cutoff with enhanced absorption at higher magnetic fields, right-hand polarized waves can transition into whistler modes above a critical frequency to penetrate and deposit energy deep within overdense plasma.
Using gyrokinetic simulations with the ORB5 code, this study demonstrates that global zonal structures in the geodesic acoustic mode frequency range are non-linearly generated by the high-n component of turbulence in TCV and ASDEX Upgrade magnetic configurations, a mechanism confirmed by isolating the effect via antenna-driven turbulence modes.
This paper presents an analytic model demonstrating that ablation-driven field compression in magnetized inertial confinement fusion creates a radially bent field at the hotspot edge that negates thermal insulation benefits, while showing that an initially applied mirror field configuration yields superior performance compared to standard axial fields.
This paper introduces Decoder-DeepONet (DDON), a novel interpretable operator-learning model that significantly outperforms previous neural network and classical methods in reconstructing electric field profiles from EFISH signals by offering superior accuracy, generalizability, and robustness to incomplete data while identifying optimal sampling windows.
This paper experimentally demonstrates that high-power laser pulses propagating through air undergo periodic collapse arrest events driven by rotational nonlinearity, generating topologically constrained spatiotemporal optical vortices that organize into charge-separated arrays and create a temporal intensity comb for controlled long-range filamentation.
This paper presents a weakly nonlinear, multi-mode theory for Rayleigh-Taylor instability on a time-varying spherical interface, revealing that Bell-Plesset effects dramatically amplify growth and drive a powerful nonlinear selection rule that preferentially channels energy into axisymmetric modes.
This study utilizes validated particle-tracking simulations to demonstrate that optimizing electrospray thruster placement and utilizing deployable solar arrays can significantly mitigate plume impingement contamination on CubeSat solar arrays while maintaining high thrust efficiency across various spacecraft configurations.
This paper presents a method using Dirac's theory of constraints to systematically enforce quasineutrality and charge density conservation in electrostatic plasma models (Vlasov-Poisson and Vlasov-Ampère) by constructing generalized Dirac brackets that eliminate the electric field and introduce specific advection terms, thereby enabling a rigorous assessment of the quasineutral approximation's validity across kinetic scales.
This study presents the first fully kinetic simulations demonstrating that self-excited wave-wave and wave-particle interactions in a warm plasma can rapidly diffuse runaway electrons backward, reducing their current by nearly half on timescales far shorter than experimental shot durations.
This paper presents detailed 3D velocity measurements of a premagnetized argon gas-puff Z-pinch implosion, revealing that the spontaneous rotation is driven by the Lorentz force and that even a small axial magnetic field can suppress the zippering effect to improve stagnation homogeneity.
Experiments at the Scarlet Facility using a $10^{21}^2$ laser on thick tantalum targets revealed that while bare targets produced the highest MeV electron and X-ray yields, thicker front-surface coatings like foam and nanowires enhanced heavy ion acceleration, highlighting the critical role of coating density and thickness in optimizing particle generation and suggesting post-damage crater analysis as a viable method for benchmarking laser absorption.
This paper proposes a self-consistent model explaining anomalously large nickel isotope enrichment in ultrafast laser ablation plasmas through a magnetic centrifuge mechanism driven by rapid ion cyclotron rotation and Ion Bernstein Waves, rather than hydrodynamic plasma rotation.
This paper utilizes 2D3V PIC simulations to demonstrate that in freely decaying sub-ion turbulence, intermittent regions with non-zero drive helicity reduction, motivating a new history-dependent helicity density that reveals time-invariant intermediate-scale plateaus consistent with kinetic decay constraints.
Using multi-spacecraft observations from Earth's magnetosheath, this study provides the first quantitative evidence that compressible MHD turbulence exhibits a weak-to-strong transition specifically in slow modes, while fast modes remain weakly turbulent, thereby offering a comprehensive characterization of spatiotemporal properties across different turbulence regimes.
Using high-resolution MMS data from the outer Plasma Sheet Boundary Layer, this study characterizes Kinetic Alfvén Wave turbulence through a steep kinetic-range spectral slope and impulsive parallel electric fields, providing observational evidence for collisionless energy dissipation via direct wave-particle interactions in the magnetotail.
This study employs 2D particle-in-cell simulations to demonstrate that continuous compression in magnetically arrested disk plasmas drives pressure anisotropy and triggers kinetic instabilities like the ion cyclotron and mirror modes, which regulate anisotropies and generate nonthermal energy spectra in ways that depend critically on plasma beta, temperature, and compression rates, thereby providing essential constraints for global fluid models of black hole accretion.
This paper demonstrates that chiral dynamos, proposed as a mechanism for generating magnetic fields in protoneutron stars and the early universe, are significantly inefficient and often suppressed because realistic timescales for chirality imbalance creation and chiral flipping rates drastically limit the instability growth rate.