Counter Collision of High-Energy Plasma Flows in a Longitudinal Magnetic Field

Plasma Physics Reports - In the paper, experimental results concerning the dynamics of the counter interaction of high-energy plasma flows in a magnetic field with an induction of up to 2 T are...     

Dynamics of Pulsed X-Ray Radiation of a Plasma Micropinch Discharge

Plasma Physics Reports - A complex of diagnostic equipment has been created and a measurement procedure has been developed for a multi-channel scintillation X-ray spectrometer with nanosecond time...     

Parametric Interaction of High-Power Laser Radiation with Plasma in a Strong Magnetic Field

Plasma Physics Reports - The article deals with interaction of an extraordinary laser wave of high amplitude with inhomogeneous plasma in a strong magnetic field in the vicinity of twice the...     

Charge Fluctuations on a Dielectric Surface Exposed to Plasma Flows or UV Radiation

It is shown that fluctuating charge spots and local electric fields of up to 10⁶ V/m and higher can form on a dielectric surface exposed to charged particle flows. A stochastic differential equation describing the dynamics of these fluctuations is derived.     

Collision of Ion-Acoustic Solitary Waves in Plasma

The process of collision of ion-acoustic solitary waves in a collisionless plasma with cold ions and Boltzmann electrons is studied using numerical simulations. It is shown that solitary waves with sufficiently large amplitudes do not preserve their identity after the collision. Their amplitudes decrease, and the shapes change. It is found that the collision is accompanied by the generation of fast ions with velocities exceeding threefold the ion sound speed.     

Impact of a High-Power Pulsed Plasma Flow with a Surface of High-Temperature Materials

Plasma Physics Reports - The objective of this work is to study the behavior of surface layers of high-temperature metals in their interaction with a powerful pulsed plasma flow produced by a...     

Use of Plasma Flows to Clean the Near-Earth Space

Plasma Physics Reports - A system for cleaning near-Earth space from space debris in the upper layers of the atmosphere is proposed, which is based on a plasma accelerator that uses the medium of...     

Generation and Diagnostics of Pulse Plasma Flows

Plasma Physics Reports - Pulsed plasma accelerators are widely used for the production of high-temperature pulsed plasma flows for fundamental and practical applications. The basic parameters of...     

Measurements of the X-Ray Line Spectrum of a Micropinch Source by a High-Sensitive Track Detector

Plasma Physics Reports - The efficiency of the diffusion chamber as a tool for diagnostics of pulsed high-temperature plasma in a single discharge is demonstrated. Creation of a diffusion chamber...     

Radiation Pattern and Radiation Spectrum of the Plasma Asymmetrical Dipole Antenna

Plasma Physics Reports - Results of comparative experimental studies of the radiation patterns and radiation spectra of the plasma asymmetrical dipole antenna and metal asymmetrical dipole antenna...     

Energy of Plasma Flows Accelerated in a Current Sheet as a Function of the Current Flowing through the Sheet

The energy of directed plasma flows accelerated in a current sheet is studied experimentally as a function of the current flowing through the sheet. It is found that the plasma flow energy rapidly increases with increasing current amplitude, nearly according to a power law with an exponent of 1.8–1.9. Using relations for the neutral current sheet and the concept of plasma acceleration under action of the Ampère forces, the energy of directed plasma flows is estimated as a function of the total current flowing through the sheet. It is shown that, as the current rises, the ion energy grows due to an increase in both the Ampère forces and the width of the current sheet within which plasma is accelerated.     

Data Acquisition System for Obtaining Optical and X-Ray Spectra and Images of Radiation Generated in Optical Breakdown Plasma Channels in Bessel Beams

Plasma Physics Reports - A four-channel scheme of an experiment aimed at obtaining optical and X-ray spectra and images of radiation generated in optical breakdown plasma channels in Bessel beams...     

Study of Plasma Flows Generated in Plasma Focus Discharge in Different Regimes of Working Gas Filling

Results are presented from experimental studies of the plasma flows generated in the KPF-4 Phoenix Mather-type plasma focus device (Sukhum Physical Technical Institute). In order to study how the formation and dynamics of the plasma flow depend on the initial distribution of the working gas, a system of pulsed gas puffing into the discharge volume was developed. The system allows one to create profiled gas distributions, including those with a reduced gas density in the region of plasma flow propagation. Results of measurements of the magnetic field, flow profile, and flow deceleration dynamics at different initial distributions of the gas pressure are presented.     

Experimental Studies of High-Energy Quasi-Steady Plasma Streams Generated by a Magnetoplasma Analogue of the Laval Nozzle in the Compression and Acceleration Regimes

Plasma Physics Reports - Results of many-year-long studies of high-power quasi-stationary acceleration and compression systems whose channel is a magnetoplasma analogue of the Laval nozzle are...     

Radiation Spectra of the Plasma Relativistic Microwave Oscillator

Plasma Physics Reports - The spectral composition of high-power microwave radiation of the plasma relativistic oscillator in the range of 1−4 GHz was studied experimentally as a function of...     

A Plasma Focus Device with a 2-MA Discharge Current as a Hard X-Ray Source

A device based on a pulsed current generator with capacitive energy storage loaded on a plasma focus (PF) chamber is described. The device provides a discharge current amplitude of up to 2 MA in the PF chamber at a stored energy in the capacitor bank of up to 150 kJ. The PF chamber is designed to study hard X-ray (HXR) emission. It has windows for output of HXR emission in the cathode direction, as well as a special insert for output of HXR emission into the anode cavity. A study of operation of the chamber as a part of the setup with the use of various X-ray targets on the anode has been carried out. At a discharge current of 1.5MA, an HXR pulse with an average duration of 16 ns and energy spectrum from 10 to 200 keV, which provides an absorbed dose in the irradiated samples on the order of 1 Sv, is generated in the PF chamber.     

Isolation,X-Ray Structure and Biological Activity of Deacetyl-dihydrobotrydial Produced by Botrytis squamosa

Mitogenic substances on human peripheral blood mononuclear leukocytes were screened from culture filtrates of microorganisms newly isolated from soil and sea water by measuring [³H]- thymidine incorporation into the cells. Strong mitogenic activity was found in marine bacteria, particularly in marine vibrios. These mitogen samples exhibited neither hemagglutinating activity nor leukoagglutinating activity. They could scarcely stimulate murine lymphocytes.

Cell-cell interaction among leukocyte subsets in response to a bacterial mitogen was investigated using the most powerfully mitogenic sample (culture filtrate of strain H 52–2). A slight decrease in the mitogen response was observed on depletion of plastic surface adherent cells. Separation of T and non-T cells from each other by erythrocyte-rosette sedimentation resulted in a markedly diminished mitogen response. Considerable restoration of the mitogen response was obtained when T cells were mixed with mitomycin C-treated adherent cells or mitomycin C-treated non-T lymphocytes, or when non-T lymphocytes were mixed with mitomycin C-treated T cells.