40 citations · 152 across the 22 of their papers we have counts for
22 papers
Structure of self-generated magnetic fields in laser-solid interaction from proton tomography
Jesse Griff-McMahon, Christopher A. Walsh, Vicente Valenzuela-Villaseca +9
Strong magnetic fields are naturally self-generated in high-power, laser-solid interactions through the Biermann-battery mechanism. This work experimentally characterizes the 3D lo…
Particle collisionality in scaled kinetic plasma simulations
S. R. Totorica, K. V. Lezhnin, W. Fox
Kinetic plasma processes, such as magnetic reconnection, collisionless shocks, and turbulence, are fundamental to the dynamics of astrophysical and laboratory plasmas. Simulating t…
Expansion-Driven Self-Magnetization of High-Energy-Density Plasmas
K. V. Lezhnin, S. R. Totorica, J. Griff-McMahon +4
Understanding plasma self-magnetization is one of the fundamental challenges in both laboratory and astrophysical plasmas. Self-magnetization can modify the plasma transport proper…
Particle-in-cell simulations of expanding high energy density plasmas with laser ray tracing
K. V. Lezhnin, S. R. Totorica, A. S. Hyder +5
The design and analysis of high energy density (HED) laser experiments typically rely on radiation hydrodynamics simulations. However, some laser-plasma interaction regimes are not…
X-ray imaging and electron temperature evolution in laser-driven magnetic reconnection experiments at the National Ignition Facility
V. Valenzuela-Villaseca, J. M. Molina, D. B. Schaeffer +13
We present results from X-ray imaging of high-aspect-ratio magnetic reconnection experiments driven at the National Ignition Facility. Two parallel, self-magnetized, elongated lase…
On parallel laser beam merger in plasmas
K. V. Lezhnin, Kenan Qu, N. J. Fisch +1
Self-focusing instability is a well-known phenomenon of nonlinear optics, which is of great importance in the field of laser-plasma interactions. Self-focusing instability leads to…
Focusability in the multi-pump Raman amplification of short laser pulses
K. V. Lezhnin, K. Qu, N. J. Fisch
Spatially combining multiple strong laser beams is a promising concept for achieving ultrahigh laser intensities. Proof-of-principle experiments have been conducted at the National…
Laser ion acceleration from tailored solid targets with micron-scale channels
K. V. Lezhnin, S. V. Bulanov
Laser ion acceleration is a promising concept for generation of fast ions using a compact laser-solid interaction setup. In this study, we theoretically investigate the feasibility…
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…
Suppression of power losses during laser pulse propagation in underdense plasma slab
K. V. Lezhnin, K. Qu, N. J. Fisch
For current state-of-the-art terawatt lasers, the primary laser scattering mechanisms in plasma include Forward Raman Scattering (FRS), excitation of plasma waves, and the self-mod…
Fast magnetic reconnection in highly-extended current sheets at the National Ignition Facility
W. Fox, D. B. Schaeffer, M. J. Rosenberg +12
Fast magnetic reconnection was observed between magnetized laser-produced plasmas at the National Ignition Facility. Two highly-elongated plasma plumes were produced by tiling two…
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…
Evolution of supermassive black hole binaries and tidal disruption rates in nonspherical galactic nuclei
Kirill Lezhnin, Eugene Vasiliev
Binary supermassive black holes (SMBH) are expected to form naturally during galaxy mergers. After the dynamical friction phase, when the two SMBHs become gravitationally bound to…
High power gamma flare generation in multi-petawatt laser interaction with tailored targets
K. V. Lezhnin, P. Sasorov, G. Korn +1
Using quantum electrodynamics particle-in-cell simulations, we optimize the gamma flare (-flare) generation scheme from interaction of high power petawatt-class laser pulse with…
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.…
On annihilation of the relativistic electron vortex pair in collisionless plasmas
K. V. Lezhnin, F. F. Kamenets, T. Zh. Esirkepov +1
In contrast to hydrodynamic vortices, vortices in plasma contain an electric current circulating around the center of the vortex, which generates a magnetic field localized inside.…
Tidal disruption rates in non-spherical galactic nuclei formed by galaxy mergers
Kirill Lezhnin, Eugene Vasiliev
We explore the rates of tidal disruption events (TDEs) of stars by supermassive black holes (SBHs) in galactic nuclei formed in mergers followed by a formation and coalescence of a…
Explosion of relativistic electron vortices in laser plasmas
K. V. Lezhnin, F. F. Kamenets, T. Zh. Esirkepov +4
The interaction of high intensity laser radiation with underdense plasma may lead to the formation of electron vortices. Though being quasistationary on an electron timescales, the…
Laser Ion Acceleration from Mass-Limited Targets with Preplasma
K. V. Lezhnin, F. F. Kamenets, T. Zh. Esirkepov +4
The interaction of high intensity laser radiation with mass-limited target exhibits significant enhancement of the ion acceleration when the target is surrounded by an underdense p…
Suppression of stellar tidal disruption rates by anisotropic initial conditions
Kirill Lezhnin, Eugene Vasiliev
We compute the rates of capture of stars by supermassive black holes, using time-dependent Fokker--Planck equation with initial conditions that have a deficit of stars on low-angul…
Effect of Electromagnetic Pulse Transverse Inhomogeneity on the Ion Acceleration by Radiation Pressure
K. V. Lezhnin, F. F. Kamenets, V. S. Beskin +3
In the ion acceleration by radiation pressure a transverse inhomogeneity of the electromagnetic pulse results in the displacement of the irradiated target in the off-axis direction…
On the spherically-symmetric turbulent accretion
V. S. Beskin, K. V. Lezhnin
We analize the quasi-spherical accretion in the presence of axisymmetric vortex turbulence. It is shown that in this case the turbulence changes mainly the effective gravity potent…