Dressed test particles，oscillation centers and pseudo orbits
Dressed test particles, oscillation centres and pseudo-orbits
摘要：
提出了一种精确有效地数值计算非相对论性试验粒子在各向同性、无碰撞、非磁化等离子体中运动时的介电屏蔽势的一般半解析方法。该方法不需要近似，并说明使用计算结果的两种情况下采取的硕士论文的第一作者：测试粒子的速度以上和以下的离子声速在等离子体麦克斯韦离子和暖电子。等离子体的涨落谱可以描述为\emph{non-interacting}修饰的测试粒子周围的场的叠加，这是准粒子概念的一种表达，它也在振荡中心和伪轨道形式主义的发展中得到了表达。
英文摘要：
A general semi-analytical method for accurate and efficient numerical calculation of the dielectrically screened ("dressed") potential around a non-relativistic test particle moving in an isotropic, collisionless, unmagnetised plasma is presented. The method requires no approximations and is illustrated using results calculated for two cases taken from the MSc thesis of the first author: test particles with velocities above and below the ion sound speed in plasmas with Maxwellian ions and warm electrons. The idea that the fluctuation spectrum of a plasma can be described as a superposition of the fields around \emph{non-interacting} dressed test particles is an expression of the quasiparticle concept, which has also been expressed in the development of the oscillation-centre and pseudo-orbit formalisms.
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