arXiv subjects

E. V. Vikhrov

Publications and source records attributed to E. V. Vikhrov.

4 recordsLinked to original sources

arXiv2026

Simulation of ultracold plasma expansion in homogeneous magnetic field

We present molecular dynamics simulation results for an ultracold $^{40}$Ca plasma in a constant, homogeneous magnetic field. The magnetic field induces a significant spatial separation of charges. Furthermore, a significant fraction of the electrons escapes from the region bounded by the ions, in contrast to the case of plasma expansion into a vacuum. This leads to the formation of a quasineutral plasma core containing the remaining electrons and surrounded by an outer, thick ion shell, where the ion density drops sharply. Anisotropy in the ion kinetic energy is also observed, depending on the direction of ion motion relative to the magnetic field lines. The simulation results are in agreement with experimental data on ion dynamics.

physics.plasm-ph↗

arXiv2023

Electronic resonances in expanding non-neutral ultracold plasma

We present a calculation of the natural oscillation spectrum of inhomogeneous non-neutral ultracold plasma. The collective modes of these plasma oscillations are recorded in experiments as absorption resonances of radio-frequency electric field. It is shown that in the presence of friction of the electronic component, a discrete spectrum of plasma eigenoscillations is formed. Dependence of the frequency of these resonances on the charge imbalance and on the expansion time is obtained. Good agreement with the experiments of different authors is noted.

physics.plasm-ph↗

arXiv2022

Electric field in spatially inhomogeneous non-neutral plasma

We present a general expression for the probability distribution function of electric field in a plasma cloud formed by the impact of a laser pulse on a gas or a solid body. We also present the results of numerical calculation of this function for the case of non-interacting particles depending on the plasma cloud size. It takes into account the ionic microfield and the macrofield arising from the charge imbalance. As the charge imbalance increases, the effect of a sharp increase in the distribution function for large field values is observed. Good agreement between the calculation of the shift of the spectral line and the experiment is obtained. The results obtained are of crucial importance for diagnosing plasma in various applications.

physics.plasm-ph↗

arXiv2021

The ion wave formation during the ultracold plasma expansion

We present the results of direct simulation of the expansionof a two-component ultracold plasmafor various numbers of particles, densities, and electron temperatures. A description of the expansionprocess common to all plasma parameters is given. After the escape of fast electrons from the plasmacloud, the excess positive charge is localized at the outer boundary, in a narrow layer. This layerhas a characteristic front shape with a sharp drop in the charge concentration. The charged layerretains the remaining electrons during the entire expansion process. As the plasma expands, thespeed of movement of the charged layer becomes constant and significantly exceeds the sonic speedof ions. In addition, the dependence of the radial velocity of ions on the radius acquires a self-similarcharacter long before the final stage of expansion. On the basis of the calculation results, equationsand self-similar solutions are obtained. General dependences on plasma parameters are determined,which are compared with experimental data.

physics.plasm-ph↗