Effects of dust particles in plasma kinetics: Ion dynamics time scales

Angelis, U. de; Tolias, Panagiotis; Ratynskaia, S.

doi:10.1063/1.4728084

Cited by 5 publications

(1 citation statement)

References 28 publications

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“…In the presence of electron impact ionization, a heuristic Klimontovich equation has been derived for the plasma subsystem of a partially ionized plasma under some major simplifications. [49,68,69] The neutrals are assumed to constitute a thermodynamic reservoir, being described with a non-fluctuating distribution function that is a Maxwell-Boltzmann distribution of a prescribed temperature. The bound electrons are not considered at all.…”

Section: Ambient Plasma Idealizationsmentioning

confidence: 99%

On the Klimontovich description of complex (dusty) plasmas

Tolias

2023

Contrib. Plasma Phys

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The numerous idealizations that are involved in the exact microscopic statistical description of complex (dusty) plasmas are discussed in detail. The two prevailing approaches in the Klimontovich description of dusty plasmas are reviewed in a pedagogical manner. The continuous phase space approximation is introduced, within which the more rigorous treatment should collapse to the more heuristic treatment. The plasma Klimontovich equations are shown to be identical, but there are marked differences in the dust Klimontovich equations whose origin is analysed in depth.

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Section: Ambient Plasma Idealizationsmentioning

confidence: 99%

On the Klimontovich description of complex (dusty) plasmas

Tolias

2023

Contrib. Plasma Phys

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BABE – a brush cathode discharge for thermal fluctuation measurements

2014

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For experimental tests of fluctuation theory in ideal plasmas and plasmas seeded with dust, the ideal environment would be that of stable quiescent plasma. In most laboratory plasmas the homogeneous state of the positive column is often unstable, rare exceptions are the so-called brush cathode discharges, proposed in the 60s, where a specially manufactured cathode allows stable operation in the abnormal glow regime and the only fluctuations present are those due the thermal motion of the particles. Such a device, the BAri Brush Electrode (BABE), has recently been built in a novel configuration that combines the advantages of the inverse design with those of the reflex geometry. The region between the two anodes is essentially field-free and extremely stable in wide range of plasma densities and collisionalities. Unprecedented low fluctuation levels of δn/n 6 10 −5 in He and δn/n 6 5 × 10 −6 in Ar discharges have been achieved. Plasma kinetic theory as a basis of diagnostic methodsThermal fluctuations in plasmas are omnipresent and triggered by particle discreteness and the electromagnetic fields induced by it. Fluctuation theory describes fundamental plasma processes providing expressions for the evolution of the averaged and fluctuating distribution functions as well as the collision integral whose dependence on the dynamic permittivity manifests the collective nature of plasma interactions (Klimontovich 1967; Tsytovich 1995). The fluctuation framework also provides expressions for the spectral densities of fluctuating plasma quantities, e.g. electron and ion densities or electrostatic field, as function of the averaged distribution function (Sitenko 1967;Akhiezer et al. 1975). This particular outcome of fluctuation theory constitutes the basis of a number of independent diagnostics that can be implemented in diverse plasma environments.While fluctuation theory is rigorous for collisionless fully ionized plasmas, there exist regimes where approximate methods have to be invoked. Measurements of the thermal fluctuations in laboratory plasmas offer the possibility to explore such regimes in a flexible and controllable environment. In such an environment, one might be able to address, for instance, the effects of neutrals and electron impact ionization, or the effects of Coulomb collisions and suprathermal particle sub-populations on the spectra of the fluctuations. Moreover, the fluctuation theory for dusty plasmas has been recently developed (Tsytovich and de Angelis 1999) and is of considerable †

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Natural fluctuations in un-magnetized and magnetized plasmas

et al. 2015

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There are still open issues within the fluctuation theory of plasmas, in view of the difficulty of formulating adequate theoretical approaches and solving the related equations in particular regimes. A promising alternative approach is direct microphysical modeling based on first principles, as successfully applied to neutral rarefied fluids. Within this approach, the equations of motion of a large ensemble of charged particles are solved numerically while correlations are obtained from statistical analysis of the ensemble at different times. As a first step, in this work we validate the data analysis technique adopted in this numerical scheme for the case of an electron ensemble neglecting Coulomb interactions. The simulation results are compared with the analytical theory of 'natural' fluctuations for both unmagnetized and magnetized plasmas. For the latter, the derivations for arbitrary average distribution functions are presented.

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Effects of dust particles in plasma kinetics: Ion dynamics time scales

Cited by 5 publications

References 28 publications

On the Klimontovich description of complex (dusty) plasmas

On the Klimontovich description of complex (dusty) plasmas

BABE – a brush cathode discharge for thermal fluctuation measurements

Natural fluctuations in un-magnetized and magnetized plasmas

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