Collective effects in a dusty plasma with a magnetic field irradiated by hard radiation

Abstract

The transfer coefficients of a rarefied low-temperature plasma (hereinafter referred to as LTP) with a condensed dispersed phase (hereinafter referred to as CDF) were calculated for characteristic temperatures T = 50 – 100 K in weak external magnetic fields (B = 10–6 – 1 Gauss). These effects of irradiation of LTP CDF plasma with X-ray and γ-ray fluxes, highenergy charged particles (electrons, positrons, protons and α-particles) are shown. For systems of positively charged monodisperse nanoparticles, new frequencies of collective MHD oscillations are determined. Significant physical differences between such interacting systems and their influence on the redistribution between the kinetic energy of particle flows and (also the energy of incident quanta of hard radiation) to magnetic and vice versa are shown. In this regard, the degree of dissipative scattering of energy entering the system is relevant for the interpretation of experimental spectroscopic data on scattering. The effects of such scattering are considered on specific examples. By its nature, the first type of scattering of the energy entering the physical systems under consideration consists in local energy losses due to pair interactions with atoms, molecules, and CDF of the medium. The second type of interactions considered is the scattering of charged particle flows and turbulent (like cyclonic vortices) LTP structures with CDF located in an external magnetic field. Comparison of these two mechanisms of dissipative losses shows their comparability.For the physical systems considered above, the transfer coefficients we are received. The relaxation times–τand gyrofrequencies– ω for a two-component electron gas during its interaction with CDF and ions of atoms and molecules in an external magnetic field are shown.For this multicomponent plasma, based on the Braginsky criteria (ωτ≫1, or ωτ≪1), for applying the previously obtained relations for the transfer coefficients between various plasma components are shown. It was found that the thermal, low-energy electronic component of the LTP is responsible for the recombination of atomic ions and the discharge of CDFs. The high-energy electrons Auger component leads to large temperature gradients and, as a consequence, significant heat fluxes. In turn, it has been shown that large temperature gradients cause significant currents of the charged component of NTP (electrons, atomic and molecular ions, CDF). It is shown that, in turn, the plasma generates local magnetic fields. The magnetic Reynolds number ea ≫ 1who was calculated in this work are shown that the plasma becomes turbulent. The main conclusion of the work is the proof that a charged monodisperse ultra-low density CDF in the field of hard radiation and an external magnetic field is almost always turbulent.