Observation of the Effects of Dust Particles on Plasma Fluctuation Spectra

Ratynskaia, S.; Angeli, M. De; Angelis, U. de; Marmolino, C.; Capobianco, Giovanni; Lontano, M.; Lazzaro, E.; Morfill, G. E.; Gervasini, Guillermo

doi:10.1103/physrevlett.99.075002

Cited by 22 publications

(22 citation statements)

References 15 publications

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“…10,23 It is worth commenting on the difference between the present results and those previously published in Ref. 20. The qualitative picture of the phenomenon is preserved; the presence of dust does enhance the fluctuation power in the low-frequency range.…”

Section: Spectral Measurementscontrasting

confidence: 53%

“…A wider frequency range of fluctuations previously observed is due to the different background plasma ͑"reference" spectra measured in dust free plasmas here and in Ref. 20 are not the same͒.…”

Section: Spectral Measurementsmentioning

confidence: 56%

“…The peaks on the spectra reported in Ref. 20 have been found to be connected with the mechanism of plasma production and microwaves coupling. A wider frequency range of fluctuations previously observed is due to the different background plasma ͑"reference" spectra measured in dust free plasmas here and in Ref.…”

Section: Spectral Measurementsmentioning

confidence: 90%

“…20 The density profiles are flat within 10% variation in the region of few centimeters from the center hence excluding any significant role of gradient driven instabilities.…”

Section: Methodsmentioning

confidence: 98%

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Plasma fluctuation spectra as a diagnostic tool for submicron dust

et al. 2010

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It is shown that the measurements of density fluctuation spectra in dusty plasmas can constitute a basis for in situ diagnostic of invisible submicron dust. The self-consistent kinetic theory that includes the charging processes and the natural density fluctuations of the dust particles predicts modifications of the spectra due to the presence of dust. A laboratory experiment was carried out where submicron dust was produced in a gas phase and diagnosed by surface analysis of samples and by measurements of its influence on the plasma density fluctuation spectra. Quantitative comparison of the latter with the theory yields information on dust density, size, and distribution in agreement with the results of the surface analysis. The method can be applied to various plasma environments in laboratory and space.

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Section: Spectral Measurementscontrasting

confidence: 53%

Section: Spectral Measurementsmentioning

confidence: 56%

Section: Spectral Measurementsmentioning

confidence: 90%

“…20 The density profiles are flat within 10% variation in the region of few centimeters from the center hence excluding any significant role of gradient driven instabilities.…”

Section: Methodsmentioning

confidence: 98%

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Plasma fluctuation spectra as a diagnostic tool for submicron dust

et al. 2010

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“…In addition, it was shown that the modification of the plasma fluctuation spectra due to the presence of dust, as predicted by the model, can be used as a diagnostic for sub-micron dust. 9,10 Typical laboratory complex plasmas are weakly ionized and collisions with neutrals are important for dust dynamics. An approach for the description of such a system has been proposed in Ref.…”

Section: Introductionmentioning

confidence: 99%

Kinetic models of partially ionized complex plasmas in the low frequency regime

2011

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The results from three kinetic models of complex plasmas taking into account collisions with neutrals are compared in the low-frequency regime: The "full" model which considers the absorption of plasma fluxes on dust particles and dust charge fluctuations, the "multi-component" model where both these effects are neglected, and the "standard" model which takes into account the dust charge perturbations but not the absorption of fluxes. We derive and numerically evaluate expressions of the low frequency responses of these models, also taking into account the modification of the capture cross-sections due to the effect of neutrals. The role of plasma sources and collisions with neutrals is assessed by computing the plasma permittivities and static permittivities for all the three models.

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Novel Diagnostics for Dust in Space, Laboratory and Fusion Plasmas

Castaldo

2011

Contrib. Plasma Phys.

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In situ diagnostics for mobile dust, based on dust impact ionization phenomena, as well as silica aerogel dust collectors are discussed for applications to space and fusion plasmas. The feasibility of an electro-optical probe to detect hypervelocity (> 1 km/s) dust particles in tokamaks is evaluated. For quiescent plasmas, a diagnostic of submicron dust based on measurements of plasma fluctuation spectra can be used.

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Observation of the Effects of Dust Particles on Plasma Fluctuation Spectra

Cited by 22 publications

References 15 publications

Plasma fluctuation spectra as a diagnostic tool for submicron dust

Plasma fluctuation spectra as a diagnostic tool for submicron dust

Kinetic models of partially ionized complex plasmas in the low frequency regime

Novel Diagnostics for Dust in Space, Laboratory and Fusion Plasmas

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