arXiv subjects

Anton Kananovich

Publications and source records attributed to Anton Kananovich.

6 recordsLinked to original sources

arXiv2026

Investigation of Shock Wave Dynamics in Complex Plasma via Computational Modelling

Piston-driven shock waves in dusty plasma monolayers have been observed experimentally and studied using molecular dynamics (MD) simulations. However, previous MD simulations were restricted to strictly two-dimensional geometries with periodic or reflecting boundaries and therefore could not capture the out-of-plane buckling of microparticles observed experimentally under shock compression. We present three-dimensional MD simulations of a piston-driven shock in a two-dimensional dusty plasma. The model incorporates finite-harmonic vertical confinement, fixed boundaries, Epstein drag and a microparticle size distribution matched to previous experiments. The simulations recover the experimentally observed linear scaling between the shock and piston Mach numbers and, to the best of our knowledge, reproduce, for the first time in MD, shock-induced buckling of the monolayer. These results bridge a long-standing gap between laboratory observations and simulations of two-dimensional dusty plasma shocks, and provide a validated framework for investigating out-of-plane and wake-mediated shock physics in strongly coupled systems.

physics.plasm-ph↗

arXiv2025

Large Errors in Kinetic Temperature Measurements Using Particle Tracking Velocimetry

We report on random errors in kinetic temperature measurements due to finite spatial resolution in particle tracking velocimetry. Using simulated data, we isolate the error caused by finite spatial resolution from other sources of uncertainty, such as particle acceleration and particle mismatch. A sample of particle velocities is generated from a Maxwellian distribution at a prescribed kinetic temperature. Particle positions are assigned randomly and discretized to match a prescribed spatial resolution. Velocities are reconstructed using the two-frame tracking method, and the resulting kinetic temperature is calculated and compared to the true kinetic temperature. Results show that under typical experimental conditions, the uncertainty in particle positions propagates into large errors in the velocity distribution and the measured kinetic temperature. We find that this might introduce errors ranging from tens of percent at high kinetic temperatures ($\sim 10$~eV) to thousands of percent at low temperatures ($\sim 0.1$~eV).

physics.plasm-ph↗

arXiv2024

Quadrilateral Particle Arrangement within Shocks in a Two-Dimensional Dusty Plasma

The microscopic structure within a two-dimensional shock was studied using data from a dusty plasma experiment. A single layer of charged microparticles, levitated in a glow-discharge plasma, was perturbed by an electrically floating wire that was moved at a steady supersonic speed to excite a compressional shock. A rearrangement of particles was observed, from a hexagonal lattice in the preshock into a quadrilateral microstructure within the shock. This quadrilateral structure would not be stable in a monolayer of identical repulsive particles, under equilibrium conditions. Glaser-Clark polygon analysis of the microstructure helped in identifying quadrilaterals. Voronoi analysis was used to characterize the defect fraction behind the shock, as an indication of shock-induced melting.

physics.plasm-ph↗

arXiv2023

Structural transformation of dusty plasma crystal in DC discharge plasma by changing confinement ring bias

We report the experimental study of the structural transition of a stable complex plasma crystal to a solid-liquid phase coexistence by the controlled adjustment of the confinement potential, while keeping all other parameters constant. The experiments are carried out in a tabletop Linear Dusty Plasma Experimental (LDPEx) device which consists of a circular powered electrode and an extended grounded cathode plate. A stationary crystal of melamine formaldehyde particles is formed in a background of Argon plasma inside a confining ring that is isolated to the cathode by a ceramic cover. The stable crystal structure breaks in the core region and transitions to a coexistent state by carefully changing the confining potential, thereby modifying the sheath structure. The transition is confirmed by evaluating the variation in different characteristic parameters such as the pair correlation function, local bond order parameter, and dust kinetic temperature as a function of confining bias potential. It is found that melting in the core is due to the onset of dust fluctuations in the layers beneath the topmost layer, which grow in amplitude as the confining bias potential is reduced below a threshold value. The present technique of changing confinement provides a unique feature to study structural transitions of plasma crystals without affecting the overall plasma parameters.

physics.plasm-ph↗

arXiv2020

Shock width measured under liquid and solid conditions in a 2D dusty plasma

Widths of shocks are compared, under liquid and solid conditions, for a two-dimensional layer of charged microspheres levitated in a plasma. In this strongly coupled dusty plasma, a shock was launched as a blast wave by moving an exciter wire at a supersonic speed and then bringing it to a halt. Runs were repeated with the layer of microspheres prepared two ways: a crystalline-like solid, and a liquid. The liquid was sustained using laser heating, with conditions that were otherwise the same as in the solid. The shock width was found to be less in a liquid than in a solid, where it was 4 to 6 lattice constants. These measurements were based on the high-gradient region of density profiles. The profiles were obtained from particle coordinates, measured by high-speed video imaging. The spatial resolution was improved by combining particle coordinates, in the shock's frame of reference, from a sequence of images.

physics.plasm-ph↗

arXiv2020

Shocks propagate in a 2D dusty plasma with less attenuation than that due to gas friction alone

In a dusty plasma, an impulsively generated shock, i.e., blast wave, was observed to decay less than would be expected due to gas friction alone. In the experiment, a single layer of microparticles was levitated in a radio-frequency glow-discharge plasma. In this layer, the microparticles were self-organized as a 2D solid-like strongly coupled plasma, which was perturbed by the piston-like mechanical movement of a wire. To excite a blast wave, the wire's motion was abruptly stopped, so that the input of mechanical energy ceased at a known time. It was seen that, as it propagated across the layer, the blast wave's amplitude persisted with little decay. This result extends similar findings, in previous experiments with 3D microparticle clouds, to the case of 2D clouds. In our cloud, out-of-plane displacements were observed, lending support to the possibility that an instability, driven by wakes in the ion flow, provides energy that sustains the blast wave's amplitude, despite the presence of gas damping.

physics.plasm-ph↗