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arXiv 2302.11029physics.plasm-ph
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电磁波的有质动力反冲

Ponderomotive Recoil for Electromagnetic Waves

I. E. Ochs, N. J. Fisch

摘要:

当波在等离子体中的共振粒子上衰减或放大时,非共振粒子会受到反冲力,从而保持粒子和电磁场之间的总动量。理解这种力很重要,因为它可以完全否定仅基于共振粒子预测的电流驱动和旋转驱动机制。在此,将现有的这种反冲力的静电理论扩展到电磁波。虽然结果与历史上激光-等离子体相互作用的流体理论非常相似,但它现在包含了共振和非共振粒子,从而使动量守恒得到自洽的证明。此外,结果被证明是普遍有效的动力学等离子体,这是通过单粒子热等离子体模拟验证。新形式的力提供了物理洞察的性质广义闵可夫斯基(等离子体)动量的几何光学,这是对应的动量获得的领域和非共振粒子的波是自洽斜坡从消失的振幅。

英文摘要:

When waves damp or amplify on resonant particles in a plasma, the nonresonant particles experience a recoil force that conserves the total momentum between the particles and electromagnetic fields. This force is important to understand, as it can completely negate current drive and rotation drive mechanisms that are predicted on the basis of only the resonant particles. Here, the existing electrostatic theory of this recoil force is extended to electromagnetic waves. While the result bears close similarity to historical fluid theories of laser-plasma interactions, it now incorporates both resonant and nonresonant particles, allowing momentum conservation to be self-consistently proven. Furthermore, the result is shown to be generally valid for kinetic plasmas, which is verified through single-particle hot-plasma simulations. The new form of the force provides physical insight into the nature of the generalized Minkowski (plasmon) momentum of geometrical optics, which is shown to correspond to the momentum gained by the field and nonresonant particles as the wave is self-consistently ramped up from vanishing amplitude.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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