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arXiv 1505.07482physics.plasm-ph
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两个横向电磁波在碰撞等离子体中产生的纵向和横向电流

Longitudinal and transversal current in collisional plasma, generated by two transversal electromagnetic waves

A. V. Latyshev, A. A. Yushkanov

摘要:

从碰撞等离子体动力学Vlasov方程出发,得到了在平方律近似下的电场强度分布函数。考虑了弛豫型碰撞积分,即所谓的BGK(Bhatnagar,Gross,Krook)碰撞积分。导出了任意温度(电子气体任意简并程度)下的电流计算公式。这个公式包含一个一维求积。结果表明,非线性因素导致沿波矢方向的纵向电流的出现。该纵向电流正交于在线性分析处接收的已知横向经典电流。当碰撞频率趋于零时,碰撞等离子体的所有结果都符合无碰撞等离子体的相应公式。波数的小值的情况下被认为是。结果表明,在碰撞频率趋近于零时,纵向电流的接收量也符合无碰撞等离子体电流的相应表达式。对无量纲电流量随波数、电磁场振荡频率和电子与等离子体粒子碰撞频率的变化进行了图解比较。

英文摘要:

From kinetic Vlasov equation for collisional plasmas distribution function in square-law approximation on sizes of intensivities of electric fields is received. The known integral of collisions of relaxation type, so-called BGK (Bhatnagar, Gross, Krook) integral of collisions is considered. The formula for calculation electric current at any temperature (any degree of degeneration of electronic gas) is deduced. This formula contains an one-dimensional quadrature. It is shown, that the nonlinearity account leads to occurrence the longitudinal electric current directed along a wave vector. This longitudinal current is orthogonal to a known transversal classical current, received at the linear analysis. When frequency of collisions tends to the zero, all received results for collisional plasmas pass in corresponding formulas for collisionless plasmas. The case of small values of wave number is considered. It is shown, that the received quantity of longitudinal current at aspiration of frequency of collisions to zero also passes in corresponding expression of current for collisionless plasmas. Graphic comparison of dimensionless quantity of current depending on wave number, frequency of oscillations of electromagnetic field and frequencies of electron collisions with plasma particles is carry out.

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