Electrostatic fluctuations in collisional plasmas

Abstract

We present a theory of electrostatic fluctuations in two-component plasmas where electrons and ions are described by Maxwellian distribution functions at unequal temperatures. Based on the exact solution of the Landau kinetic equation, that includes electron-electron, electron-ion, and ion-ion collision integrals, the dynamic form factor, S(k[over ⃗],ω), is derived for weakly coupled plasmas. The collective plasma responses at ion-acoustic, Langmuir, and entropy mode resonances are described for arbitrary wave numbers and frequencies in the entire range of plasma collisionality. The collisionless limit of S(k[over ⃗],ω) and the strong-collision result based on the fluctuation-dissipation theorem and classical transport at T_{e}=T_{i} are recovered and discussed. Results of several Thomson scattering experiments in the broad range of plasma parameters are described and discussed by means of our theory for S(k[over ⃗],ω).

A drift of Langmuir waves in a magnetized inhomogeneous plasma

“…(2012), Plunk (2013), Wang (2013), Hau-Riege & Weisheit (2017), Rozmus et al. (2017), Shi, Qin & Fisch (2017), Belyi (2018) and Schoeffler, Loureiro & Silva (2018). Ensemble plasma averaging is also implied by any hydrodynamic modelling of plasma phenomena, and recent examples of such modelling were reported by Araki (2015), Bhattacharjee et al.…”

Picosecond Thermodynamics in Underdense Plasmas Measured with Thomson Scattering

“…was presented to account for collisions in calculations of the Thomson-scattering spectrum. 32 In this article, we report the first observation of the effects of collisions on electron plasma waves in an ideal plasma. The measurements were obtained by an ultrafast high-throughput spectrometer that provided unprecedented temporal resolution of the EPW Thomson-scattering spectra.…”

“…The Thomson-scattering spectrum calculated with the BGK model32,35 used Eq. (1), where , electron-ion collision frequency is given by o ei = ,…”

Investigation of picosecond thermodynamics in a laser-produced plasma using Thomson scattering

“…To determine the plasma conditions, the measured spectra were fit by calculating the Thomson-scattering spectra, which were in excellent agreement (see figures 2 and 3). The Thomson-scattering spectra were calculated with the structure factor [34,35]…”