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首页> 外文期刊>Plasma physics and controlled fusion >Simulation study of the filamentation of counter-streaming beams of the electrons and positrons in plasmas
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Simulation study of the filamentation of counter-streaming beams of the electrons and positrons in plasmas

机译：等离子体中电子和正电子逆流束细丝化的模拟研究

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摘要

The filamentation instability (FI) driven by two spatially uniform and counter-streaming beams of charged particles in plasmas is modelled by a particle-in-cell simulation. Each beam consists of electrons and positrons. The four species are equally dense and have the same temperature. The one-dimensional simulation direction is orthogonal to the beam velocity vector. The magnetic field grows spontaneously and rearranges the particles in space, such that the distributions of the electrons of one beam and the positrons of the second beam match. The simulation demonstrates that as a result no electrostatic field is generated by the magnetic field through its magnetic pressure gradient prior to its saturation. This electrostatic field would be repulsive at the centres of the filaments and limit the maximum charge and current density. The filaments of electrons and positrons in this simulation reach higher charge and current densities than in one with no positrons. The oscillations of the magnetic field strength induced by the magnetically trapped particles result in an oscillatory magnetic pressure gradient force. The latter interplays with the statistical fluctuations in the particle density and it probably enforces a charge separation, by which electrostatic waves grow after the FI has saturated.
机译：等离子体中的两个空间均匀且反向流动的带电粒子束驱动的长丝不稳定性（FI）通过粒子中模拟进行建模。每个束由电子和正电子组成。这四个物种密度相同，温度相同。一维模拟方向与光束速度矢量正交。磁场会自发增长，并重新排列空间中的粒子，以使一个电子束的电子分布与第二个电子束的正电子匹配。仿真表明，结果是在磁场饱和之前，磁场不会通过其磁压梯度产生静电场。该静电场将在灯丝的中心排斥，并限制最大电荷和电流密度。与没有正电子的电子和正电子的丝相比，该电子和正电子的电子丝具有更高的电荷和电流密度。由被磁捕获的颗粒引起的磁场强度的振荡导致振荡的磁压力梯度力。后者与粒子密度的统计波动相互作用，并且可能会强制执行电荷分离，在FI饱和后，静电波将通过电荷分离产生。

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