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arXiv 1104.0878physics.plasm-ph
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磁化等离子体中电场涨落引起的离子能量损失

Energy loss of ions by electric-field fluctuations in a magnetized plasma

Hrachya B. Nersisyan, Claude Deutsch

摘要:

本文报道了磁化经典等离子体中带电粒子由于电场涨落而引起的能量损失的理论研究结果。通过线性响应理论计算测试粒子的能量损失。在磁场消失时,电场波动导致带电粒子在所有速度下的能量增益。已经表明,在强磁场的存在下,这种效应仅在低速下发生。在相反的高速情况下,测试粒子由于与随机电场的相互作用而系统地损失其能量。波动的净效应是在磁场消失时总能量损失(即极化和随机能量损失之和)的系统性减少,以及在强磁场下的减少或增强,这取决于粒子的速度。结果表明,慢重离子的能量损失中含有一个反常项,该反常项与射弹质量成几何关系。这个反常项的物理来源是等离子体电子的回旋运动与抛射离子产生的长波长低频涨落之间的耦合。这种效应可以强烈地增强粒子的随机能量增益。

英文摘要:

The results of a theoretical investigation of the energy loss of charged particles in a magnetized classical plasma due to the electric field fluctuations are reported. The energy loss for a test particle is calculated through the linear-response theory. At vanishing magnetic field the electric field fluctuations lead to an energy gain of the charged particle for all velocities. It has been shown that in the presence of strong magnetic field this effect occurs only at low-velocities. In the opposite case of high-velocities the test particle systematically loses its energy due to the interaction with a stochastic electric field. The net effect of the fluctuations is the systematic reduction of the total energy loss (i.e. the sum of the polarization and stochastic energy losses) at vanishing magnetic field and reduction or enhancement at strong field depending on the velocity of the particle. It is found that the energy loss of the slow heavy ion contains an anomalous term which depends logarithmically on the projectile mass. The physical origin of this anomalous term is the coupling between the cyclotron motion of the plasma electrons and the long-wavelength, low-frequency fluctuations produced by the projectile ion. This effect may strongly enhance the stochastic energy gain of the particle.

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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