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arXiv physics/0410125physics.plasm-ph
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实验室偶极磁场等离子体中的电子朗道阻尼

Electron Landau damping in a laboratory dipole magnetic field plasma

Nikolay I. Grishanov, Abimael F. D. Loula, Carlos A. De Azevedo, Joaquim Pereira Neto

摘要:

本文导出了考虑环形电流半径有限的实验室偶极磁场等离子体(LDMFP)中射频波的横向和纵向介电常数元。LDMFP的主要特征是,与行星磁层等离子体相反,未被捕获的(循环)粒子可以沿着平衡磁场线存在/循环(与被捕获的粒子一起)。为了估计在LDMFP中吸收的波功率,将扰动电场和电流密度分量在极向角上分解成傅立叶级数。波吸收由扰动电场的所有谐波以及对角和非对角介电常数元素的贡献之和表示。在本文中,我们分析了数值的单独贡献的捕获和未捕获的电子的纵向介电常数元素的虚部LDMFP与平衡(麦克斯韦)分布函数的等离子体粒子在速度空间。这些信息是必要的估计碰撞波耗散的电子朗道阻尼。计算是在很宽的波频范围内进行的。

英文摘要:

Transverse and longitudinal dielectric permittivity elements are derived for radio frequency waves in a laboratory dipole magnetic field plasma (LDMFP) accounting for the finite ring current radius. The main feature of LDMFP is the fact that, in contrast to planetary magnetospheric plasmas, the untrapped (circulating) particles can exist/circulate (together with the trapped particles) along the equilibrium magnetic field lines. To estimate the wave power absorbed in LDMFP the perturbed electric field and current density components are decomposed in a Fourier series over the poloidal angle. The wave absorption is expressed by the summation of contributions of all harmonics of the perturbed electric field and both the diagonal and non-diagonal dielectric permittivity elements. In this paper, we analyze numerically the separate contributions of the trapped and untrapped electrons to the imaginary part of the longitudinal permittivity elements in LDMFP with an equilibrium (Maxwellian) distribution functions of plasma particles in velocity space. This information is necessary to estimate the collisionless wave dissipation by electron Landau damping. The computations are carried out in a wide range of the wave frequencies.

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