On the theory of Langmuir waves in a quantum plasma

Nonlinear quantum-mechanical equations are derived for Langmuir waves in an isotropic electron collisionless plasma. A general analysis of dispersion relations is carried out for complex spectra of Langmuir waves and van Kampen waves in a quantum plasma with an arbitrary electron momentum distribution. Quantum nonlinear collisionless Landau damping in Maxwellian and degenerate plasmas is studied. It is shown that collisionless damping of Langmuir waves (including zero sound) occurs in collisionless plasmas due to quantum correction in the Cherenkov absorption condition, which is a purely quantum effect. Solutions to the quantum dispersion equation are obtained for a degenerate plasma.     

Current generation in interaction between Langmuir solitons and a streaming plasma

A new mechanism for dc current and toroidal magnetic field generation is presented. This mechanism bases on the non-linear linear interaction between a high-frequency plasma soliton and a streaming plasma.     

Method of averaging in the kinetic theory of a plasma

A generalization of the well known Bogolyubov-Zubarev method is used to obtain an averaged kinetic equation for a rarefied plasma located in a strong magnetic field and an hf field of quasimonochromatic wave packets. It is shown that the characteristics of the averaged kinetic equation coincide with the averaged equations of motions of a single particle in the corresponding approximation.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 29–32, December, 1979.     

A kinetic theory of a relativistic plasma. II

A covariant formulation of the relativistic statistical mechanics of charged particles is developed on the basis of the tetradic method, which corresponds to the super-many-time formalism of Tomonaga known in quantum theory.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 29–31, May, 1981.     

Faraday-rotation method for magnetic-field diagnostics in a laser plasma

The possibility of using the Faraday effect for the diagnostics of magnetic fields in a dense plasma is theoretically demonstrated. A procedure for measuring the plane of polariztion of the probing radiation is examined in detail, with account taken of the wave polarization and of the presence of plasma self-luminosity. A procedure for determining the spatial distribution of the magnetic field is described. A new three-channel polarointerferometer scheme is proposed. The idea behind the method is illustrated with reconstruction of the magnetic fields in a laser plasma as an example.Laser-Plasma Laboratory, Lebdev Physics Institute. Translated from Preprint No. 135 of the Lebedev Institute of Physics, Academy of Sciences of the USSR, Moscow, 1989.     

Nonlinear Langmuir waves in a relativisitc plasma

Langmuir waves in a relativistic plasma are considered using kinetic equations without consideration of captured particles. The frequency shift found for such waves contains contributions from four-wave interaction, and a contribution produced by the relativistic dependence of electron momentum on velocity.     

Diagnostics of Langmuir oscillations in a superdense plasma

The level and the angular distribution of Langmuir oscillations in a dense plasma produced on the Phoenix plasma radiation source (PRS) were measured. Line profiles of several lines in the Lyman series of Al XIII were measured using crystal spectrometers. A spectral line shape model was used, which attempted to take into account all significant broadening mechanisms. The parameters of the plasma and the Langmuir oscillations were found by generating profiles using the model and comparing these profiles to the experimental spectra. The strength of the Langmuir oscillations was found to be E₀≈1-9 GV/cm, indicative of a strong Langmuir turbulence. The polarization analysis of the profiles of the Al XIII Lyman γ line has shown that the Langmuir oscillations develop anisotropically, primarily in the direction of the plasma current     

Collapse dynamics of a self-magnetized Langmuir plasma

We show that the set of generalized Zakharov equations which take into account the self-magnetic field reduce under certain circumstances to a generalized non-linear Schrödinger equation. We also that in the same approximation the self-magnetic field helps rather than hinders the Langmuir collapse.     

Spin damping correction to electrostatic modes in kinetic plasma theory

The effect of spin of particles is studied using a semi-classical kinetic theory for a magnetized plasma. No other quantum effects are included. We focus in the simple damping effects for the electrostatic wave modes. Besides Landau damping, we show that spin produces two new different effects of damping or instability which are proportional to ?. These corrections depend on the electromagnetic part of the wave that is coupled with the spin vector.     

Parametric excitation of Langmuir oscillations in a relativistic electron plasma

A systematic discussion is carried out of the parametric action of an external high-frequency field on a high-temperature plasma. The conditions for the onset of parametric resonance and the corresponding increments, as well as the frequency shift of the Langmuir oscillations under the action of a high-frequency field, are found.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 58–61, May, 1982.     

A kinetic analysis of Langmuir model for adsorption within the framework of Jovanovic theory; a generalization of the Jovanovic isotherm

This paper presents a comparative kinetic analysis of the Langmuir and Jovanovic models for adsorption of gases on solid surfaces. Taking into account of the settling times distribution of the adsorbed molecules on the surface, the authors suggest a generalization of the Jovanovic isotherm.     

碰撞等离子体中电中性条件对单探针测量的约束

在碰撞等离子体中使用单探针测量系统测得的伏安特性曲线会发生畸变. 实验中分别测量了非碰撞条件下(20 Pa)和碰撞条件下(400 Pa)氩气(Ar)电感耦合等离子体的单探针伏安特性曲线, 并进一步通过在400 Pa下测量不同位置处的单探针伏安特性曲线和引入干扰电极调节整体电中性约束的程度的方法来分析研究曲线的畸变现象. 结果表明碰撞等离子体中整体电中性约束条件会对非碰撞探针测量系统进行约束, 并通过理论分析和实验证明:在单探针测量过程中, 以真空室壁为电位参考点, 等离子体将通过改变自身等离子体电位来满足整体电中性的要求, 此时, 单探针测得的伏安特性曲线就不是理论上的单探针的鞘层伏安特性.     

Ion sound wave excitation in a plasma under a Langmuir turbulence regime

Ion sound wave excitation in a warm non-relativistic (W_b ≤ 400 eV) electron beam unmagnetized plasma system is studied experimentally. The spectrum of these waves shows two peaks at frequencies of 70 and 230 kHz respectively. The origin of these waves is connected with modulational instability and cavity collapse. We show that the energy of bulk accelerated electrons can explain the measured value of kr_De for high-frequency sound waves. The energy of ion sound waves is not high enough to have an influence on the Langmuir turbulence dynamics.     

PSII系统中微波ECR等离子体的朗缪尔探针诊断

用朗缪尔探针对一个新颖的双谐振腔多功能PSII系统的微波ECR等离子体进行了诊断,得出了会切场中工作气体压强和微波功率对等离子体密度和电子温度的影响,及真空室内等离子体的分布。     

基于动理论模型的一维等离子体电磁波传输特性分析

本文采用了动理论模型对电磁波在等离子体中的传播特性进行了研究.建立了与该模型相关的麦克斯韦-玻尔兹曼(MB)方程组,并采用FDTD方法加以求解,得到了等离子体区域内的粒子分布函数及空间中的电场分布.此外,本文还计算了电磁波入射到等离子体平板上的反射及透射系数,并将数值计算结果与解析解结果进行了比较,验证了该方法的正确性.     

LocalH-theorem for a kinetic variational theory

A localH-theorem is derived for a recently proposed extension of Enskog kinetic theory to a dense model fluid composed of particles with interactions extending beyond a hard core.On leave from: Katedra Fizyki, Uniwersytetu Szczecinskiego, 70-451 Szczecin, Poland.