A5010829956- Dust and Plasma Wave Phenomena
- Ionosphere and magnetosphere dynamics
- Earthquake Detection and Analysis
- Lightning and Electromagnetic Phenomena
- Laser-induced spectroscopy and plasma
- Plasma Diagnostics and Applications
- Precipitation Measurement and Analysis
- High-pressure geophysics and materials
- Atmospheric aerosols and clouds
- Plasma Applications and Diagnostics
- Astro and Planetary Science
Baylor University
2020-2024
HUN-REN Wigner Research Centre for Physics
2022
Institute for Solid State Physics and Optics
2022
Auburn University
2022
Gagarin Research and Test Cosmonaut Training Center
2022
Joint Institute for High Temperatures
2022
Moscow Institute of Physics and Technology
2022
University of California, San Diego
2022
Dust grains have been used as minimally invasive probes to determine plasma parameters including the density, temperature, and electric field in a discharge. However, dust generate local potential disturbances due collection of charge subsequent electrostatic interactions between charged particles. close proximity one another exhibit interesting non-reciprocal self-organize into structures such one-dimensional filamentary chains, two-dimensional “zigzags,” three-dimensional helices, among...
Self-organization of dust grains into stable filamentary structures (or “chains”) largely depends on dynamic interactions between individual charged and complex electric potential arising from the distribution charges within a local plasma environment. Recent studies have shown that positive column gas discharge in Plasmakristall-4 (PK-4) experiment at International Space Station supports presence fast-moving ionization waves, which lead to variations parameters by up an order magnitude...
Abstract The PK-4 system is a micro-gravity dusty plasma experiment currently in operation on-board the International Space Station. utilizes long DC discharge neon or argon gases. We apply our 2D particle-in-cell with Monte Carlo collisions simulation to compute local parameters that serve as input data for future dust dynamics models. includes electrons, Ne + ions, and m metastable atoms gas their at solid surfaces including secondary electron emission glass wall charging. On time scale of...
An interesting aspect of complex plasma is its ability to self-organize into a variety structural configurations and undergo transitions between these states. A striking phenomenon the isotropic-to-string transition observed in electrorheological under influence symmetric ion wake field. Such have been investigated using Plasma Kristall-4 (PK-4) microgravity laboratory on International Space Station. Recent experiments numerical simulations shown that, PK-4-relevant discharge conditions,...
Two-dimensional microparticle crystals can be formed in the sheath of a gas discharge plasma. Ions from bulk plasma are accelerated electric field, flowing past grains to create positive ion wake downstream grains. Interaction between and neighboring creates additional coupling oscillation modes trigger mode-coupling instability (MCI). Recent experiments have shown that at fixed power there threshold pressures above below which monolayer always crystallizes or melts, respectively. The...
The microgravity environment of the Plasmakristall-4 experiment on International Space Station provides a laboratory for exploring plasma-mediated interactions among charged dust grains in fully three-dimensional space. Away from strong influence Earth's gravity, can levitate bulk plasma, where they have been observed to form extended filamentary structures aligned with discharge tube axis. These be used as macroscopic analogue other self-organizing systems, including electrorheological...
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The dynamics of charged dust grains in complex plasmas provide unique insight into the self-assembly structures. Experiments have shown that for a given microparticle monolayer at fixed discharge power there exist two threshold pressures: above p crys , crystallizes; below MCI crystalline undergoes mode-coupling instability and two-dimensional crystal melts. Between these pressures can be either fluid or phase. In gas discharges containing micrograins, ions from bulk plasma accelerate sheath...
Charged dust grains in a complex plasma can form interesting structures, including single chains, zigzags, and twisted helices. The minimum energy of these configurations has previously been numerically investigated by varying the number confined particles or prolateness confinement potential, but ion wake gravitational potential contributions were not considered. Experimental work parallel plate rf discharge supported predicted structural transitions, with additional symmetries power...
Two-dimensional microparticle crystals can be formed in the sheath of a gas discharge plasma. Ions from bulk plasma are accelerated electric field, flowing past grains to create positive ion wake downstream grains. Interaction between and neighboring creates additional coupling oscillation modes trigger mode-coupling instability (MCI). Recent experiments have shown that at fixed power there threshold pressures above below which monolayer always crystallizes or melts, respectively. The...
The PlasmaKristall-4 (PK-4) experiment on the International Space Station (ISS) has been widely used to study collective behavior and self-organization of dust grains immersed in a plasma environment under microgravity conditions. Recently it shown that PK-4 BU, ground-based replica PK-4, supports presence inhomogeneous features related ionization waves moving through positive column microsecond timescale 1 . Plasma conditions within waves, such as density electric fields, have vary by up an...