Abstract A method is proposed for producing microwave generation in a relativistic magnetically insulated vircator in the under-limit mode of an electron beam. The method is implemented if the repeated or multiple passage of the electron beam of the drift tube is organized. In this case, a virtual cathode is formed in the vircator and the powerful microwave generation occurs. Using the particle-in-cell

Abstract— Factors affecting the calculation of the electrical conductivity of hot dense nonideal plasma systems are revisited and scrutinized. Essential features relevant to truncation of the internal partition function, Coulomb strong coupling, electronic excited states, in addition to high ionization boundary and Coulomb logarithm, are thoroughly investigated and assessed. Particular interest has

Abstract The structure of high-frequency oscillations in the plasma of a Hall thruster (HT) is studied experimentally in two different stable discharge modes: the “jet” mode and the “bell” mode. The discharge modes under study differ in the geometrical shape of the plasma plume and in the main integral characteristics of the thruster, such as the anode efficiency, driving force, and the specific momentum

Abstract— The generation of accelerated electron beams in a high-current Z-pinch formed by the implosion of wire cylindrical tungsten arrays on an Angara-5-1 facility is studied. The most intense characteristic and bremsstrahlung X-ray radiation of fast electrons is recorded from the central region of the pinch at the pin-ching stage. The transverse size of the radiation source in the characteristic

Abstract We have investigated the propagation characteristics of Ion-Acoustic Solitary Waves (IASWs) in a magnetized, cometary plasma consisting of hydrogen ions, positively and negatively charged oxygen ions, kappa described hot solar electrons, and slightly colder cometary electrons. The effects of q-nonextensive distributions, on both lighter and heavier ions have been studied by deriving the Zakharov–Kuznetsov

Abstract— It is recognized that the filaments have a significant effect on the anomalous energy and particle transport in the tokamak periphery. They are actively investigated using various diagnostics in this regard. Recently studies of filaments using the Doppler backscattering method have been performed in the Globus-M and the ASDEX-Upgrade tokamaks. Backscattering from filaments manifests itself

Abstract A brief review is given of the dusty plasma near the surface of the Moon. Electrostatic processes represent an important factor of formation of such plasma. Problems related to theoretical and numerical modeling of the plasma–dust system near the Moon, its experimental investigation, and interpretation of data on near-lunar dusty plasma are formulated.

Abstract— In the region of the surface of the probe introduced into the plasma, there are emission flows that introduce changes in the determination of its parameters. Despite the significant development of the theory of probes, when calculating plasma parameters for experimentally obtained current–voltage characteristics, electron emission is not taken into account, largely due to the serious complication

Abstract In the T-10 tokamak, the results of plasma heating at the first and second electron cyclotron (EC) harmonics differ substantially. However, the problem is multi-parametric, so it is impossible to estimate the heating quality by sight. In this work, the analysis of heating at both harmonics is provided with two transport models, which were constructed separately for simulation in each mode

Abstract The transverse electron current due to the crossed electric and magnetic fields results in the robust instability driven by the electron \({\mathbf{E}} \times {\mathbf{B}}\) drift. In the regime of interest for electric propulsion applications, this instability leads to the excitation of quasicoherent nonlinear wave resulting in the anomalous electron transport. We investigate the nonlinear

Abstract The results of studying the propagation of plasma flows in the surrounding medium performed on the PF-3 plasma focus facility in the laboratory simulation of astrophysical jets from young stellar objects are presented. The modes with the plasma formations which retain their compactness when propagated over significant distances are obtained. The decrement of the flow’s deceleration as a result

Abstract— The kinetics of hydroxyl radical formation in water under the action of a pulsed discharge in vapor-gas bubbles formed near the surface of a graphite electrode immersed into water is studied. The reaction of potassium hexacyanoferrate(II) oxidation is used to determine the concentration and formation rate of OH radicals in the liquid phase. The power dissipated in the discharge is estimated

Abstract The modifications, which arise from ultra-relativistic and degenerate effects of electrons and positrons as well as the chemical potentials in the basic features of three-dimensional isothermal ion acoustic shock waves (IIASWs) propagating in magnetized electron–positron–ion (e–p–i) plasmas are studied. The cold ions are considered to be magnetized and inertial, while the small particles (i

Abstract The present research article presents the investigation of diffraction phenomenon of EM-plane wave by a non-symmetric plate of finite length under the influence of cold plasma. The Wiener–Hopf equation is formulated by boundary value problem related to this model and Fourier transform. The standard way of Wiener–Hopf procedure is used to tackle the resulting equation. Asymptotic expansion

Abstract Pulsed plasma accelerators are widely used for the production of high-temperature pulsed plasma flows for fundamental and practical applications. The basic parameters of pulsed plasma accelerators are the characteristics of the external electric and magnetic circuits, as well as the structural and energy properties of the plasma flow. This work aims to characterize an IPU-30 pulsed plasma

Abstract We suggest a solution of the problem of the description of magnetic and electric fields occurring during large-scale nonradiative processes in the collisionless space plasma. The key idea is that the quasi-neutrality condition and the field-aligned force equilibrium of electrons should be taken into account. Equations describing the plasma are divided into two parts, namely, a system of transport

Abstract— The phenomenon of improved energy confinement during radiative cooling at the plasma edge was studied experimentally in the T-10 tokamak. It was shown that the effect is independent on the kind of radiating gas. No substantial differences were observed using Ne, which radiates at two-thirds of the plasma radius, or He, which radiates at the very edge. This phenomenon is explained in frames

Abstract The stability of a planar plasma crystal in an external confining force field is investigated. Particles are assumed to be located in the plasma with Maxwellian electrons and with a directed flow of cold ions. It is shown that, together with the coupled wave instability, four more types of aperiodic instabilities arise, which lead to the formation of different structures. A region of the crystal

Abstract The process of switching a short vacuum gap using an auxiliary discharge over the surface of a dielectric is studied by the high-speed recording of images of the plasma in the optical spectral range. Based on the analysis of the obtained experimental data, it is suggested that the cathode spot and cathode flame in the ultraviolet spectral range play a significant in the formation of current

Abstract The conditions leading to the development of fast-scale ( f ~ 0.2–1.5 MHz) electromagnetic oscillations in the periphery regions of plasma at an early stage of disruption in the T-10 tokamak are analyzed. Spatial and temporal characteristics of fast-scale oscillations are investigated by moving magnetic and electric probes mounted inside the tokamak vacuum chamber. Analysis reveals that initiation

Abstract The model of the global electric circuit of the Earth (GECE) is considered, which is inseparably linked with the processes in space plasma. The Earth is surrounded by cosmic plasma consisting of electrons, ions, and negatively charged dust particles. Dust particles easily penetrate through the magnetic field and the atmosphere and charge the surface of the Earth negatively. The stationary

Abstract— In this paper, we obtain an expression for the high-frequency quadratic susceptibility of strongly inhomogeneous magnetoactive plasma, which describes the nonlinear coupling of an ordinary wave with longitudinal oscillations.

Abstract The paper devoted to the research of the microdischarge dynamics in the dielectric barrier discharge. The discharge between rail electrodes in airflow along the electrodes at atmospheric pressure was studied. The aim of this work is to clarify the role of volume plasma and surface charges in the memory effect of microdischarges. Based on the analysis of microdischarge images obtained using

Abstract Resistive oscillations of axial plasma with ionization effects are analyzed in configuration similar to the Hall effect thrusters. From analysis of stationary equations we have identified different types of the steady-state plasma flow profiles and use these solutions as initial conditions in time-dependent initial value simulations. We have identified unstable regimes with intrinsic oscillations

Abstract A model describing the initial phase of the heating of a flare in the solar corona is proposed. The energy equation for a flare plasma in a magnetic tube is reduced to the two-dimensional equation of thermal conductivity with a nonlinear volume source that ensures the heating of the plasma in the blowup mode and nonlinear anisotropic thermal conductivity. Explosive plasma heating is shown

Abstract The results of studying the spectral characteristics of the stochastic motion of charged particles of small chain structures interacting with an arbitrary reciprocal potential in an anisotropic electric field of the trap are presented. The characteristic frequencies of the particles and the method of their analytical calculation are considered. Relations for the spectral density of displacements

Abstract Non-uniformities in the plasma parameters in a magnetized inductively coupled plasma (M-ICP) etcher were investigated. Further in text of this article the silicon dioxide and the photoresist are called as abbreviations the oxide and the PR accordingly. The etch results of an oxide and PR were correlated with the non-uniformity characteristics of the plasma parameters. The plasma density non-uniformities

Abstract A spark discharge is modelled in a long air gap of atmospheric pressure at a positive voltage with a long front duration, excluding the quasi-continuous development of the leader. It is shown that, with a front steepness of less than 30 kV/μs, an ionization wave moves in the gap, whose speed is 2 orders of magnitude slower than the speed of streamers in the streamer zone of the leader. The

Abstract The possibility of the formation of microspherules in plasma-dust processes initiated by meteoroids impacting the lunar surface is discussed. It is demonstrated that spherules are formed from the material of the melt zone created by a high-speed meteoroid impacting the lunar surface. Initially, they rise above the surface of the Moon and then fall back. It is these spherules that were found

Abstract— The stability of a linear chain of dust particles in an external confining force field is studied. It is assumed that the particles are located in a plasma with Maxwellian electrons with a directed flow of cold ions. It is shown that the aperiodic instability of doubling the chain period can develop in a subsonic flow together with the instability of coupled waves. The region of the crystal

Abstract A method for calculating fluctuations in the nonequilibrium plasma-containing random inhomogeneities is developed. Using this method, the fluctuation spectrum in the region of the plasma line is calculated for the case of large-scale inhomogeneities with their characteristic dimensions exceeding the length of plasma waves. The results obtained are valid for both strong and weak inhomogeneities