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Grain charging in an intermediately collisional plasma
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0001-9632-8104
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0002-6712-3625
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2012 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 97, no 3, 35001- p.Article in journal (Refereed) Published
Abstract [en]

The charges of mu m-size particles in the quasineutral bulk plasma of a dc discharge are determined experimentally in a pressure range between 100 and 500 Pa, spanning the transition between the weakly collisional and highly collisional (hydrodynamic) regimes, where the ion mean free path drops below the plasma screening length. The charge is determined using the force balance condition from the measured particle drift velocities in stable particle flows. A simple interpolation formula for the ion flux to the grain in the transitional regime is shown to fit quite well the experimental results.

Place, publisher, year, edition, pages
2012. Vol. 97, no 3, 35001- p.
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-91254DOI: 10.1209/0295-5075/97/35001ISI: 000300400000022ScopusID: 2-s2.0-84857094703OAI: diva2:509207
QC 20120312Available from: 2012-03-12 Created: 2012-03-12 Last updated: 2012-03-16Bibliographically approved
In thesis
1. The Klimontovich description of complex plasma systems: Low frequency electrostatic modes, spectral densities of fluctuations and collision integrals
Open this publication in new window or tab >>The Klimontovich description of complex plasma systems: Low frequency electrostatic modes, spectral densities of fluctuations and collision integrals
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Plasmas seeded with solid particulates of nanometer to micron sizes (complex plasma systems) are a ubiquitous feature of intergalactic, interstellar and planetary environments but also of plasma processing applications or even fusion devices.

Their novel aspects compared with ideal multi-component plasmas stem from (i) the large number of elementary charges residing on the grain surface, (ii) the variability of the charge over mass ratio of the dust component, (iii) the inherent openness and dissipative nature of such systems.


Their statistical description presents a major challenge; On one hand by treating dust grains as point particles new phase space variables must be introduced augmenting the classical Hamiltonian phase space, while the microphysics of interaction between the plasma and the grains will introduce additional coupling between the kinetic equations of each species, apart from the usual fine-grained electromagnetic field coupling. On the other hand complex plasma systems do not always exist in a gaseous state but can also condensate, i.e. form liquid, solid or crystalline states.


In this thesis we study gaseous partially ionized complex plasma systems from the perspective of the Klimontovich technique of second quantization in phase space. Initially, in regimes typical of dust dynamics. Starting from the Klimontovich equations for the exact phase space densities, theory deliverables such as the permittivity, the spectral densities of fluctuations and the collision integrals are implemented either for concrete predictions related to low frequency electrostatic waves or for diagnostic purposes related to the enhancement of the ion density and electrostatic potential fluctuation spectra due to the presence of dust grains. Particular emphasis is put to the comparison of the self-consistent kinetic model with multi-component kinetic models (treating dust as an additional massive charged species) as well as to the importance of the nature of the plasma particle source. Finally, a new kinetic model of complex plasmas (for both constant and fluctuating sources) is formulated. It is valid in regimes typical of ion dynamics, where plasma discreteness can no longer be neglected, and, in contrast to earlier models, does not require relatively large dust densities to be valid.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. xii, 164 p.
Trita-EE, ISSN 1653-5146 ; 2012:008
complex plasmas, dusty plasmas, Klimontovich equations, kinetic theory, dust acoustic waves, collision integrals
National Category
Fusion, Plasma and Space Physics
urn:nbn:se:kth:diva-91506 (URN)978-91-7501-284-1 (ISBN)
Public defence
2012-03-23, F3, Lindstedsvägen 26, KTH, Stockholm, 13:15 (English)
QC 20120316Available from: 2012-03-16 Created: 2012-03-16 Last updated: 2012-03-16Bibliographically approved

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Tolias, PanagiotisRatynskaia, Svetlana
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