| 1. |
- Castaldo, C., et al.
(author)
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Diagnostics of fast dust particles in tokamak edge plasmas
- 2007
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In: Nuclear Fusion. - : IOP Publishing. - 0029-5515 .- 1741-4326. ; 47:7, s. L5-L9
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Journal article (peer-reviewed)abstract
- The use of electrostatic probes as a diagnostic tool of the dust particles in the tokamak edge plasmas is investigated. Probe measurements of electrostatic fluctuations in the scrape-off layer of the Frascati Tokamak Upgrade revealed that some features of the signals can be explained only by a local non-propagating phenomenon. These signal features are shown to be both in qualitative and quantitative agreement with ionization, and consequent extra charge collected by the probes, due to the impact of micrometre-sized dust at a velocity of the order of 10 km s(- 1). Electron microscope analysis of the probe surface yielded direct support for such an interpretation.
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| 2. |
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| 3. |
- Ratynskaiy, Svetlana, et al.
(author)
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Plasma fluctuation spectra as a diagnostic tool for submicron dust
- 2010
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In: Physics of Plasmas. - : AIP Publishing. - 1070-664X .- 1089-7674. ; 17:4, s. 043703-
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Journal article (peer-reviewed)abstract
- 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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| 4. |
- Ratynskaia, Svetlana V., et al.
(author)
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Observation of the effects of dust particles on plasma fluctuation spectra
- 2007
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In: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 99:7
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Journal article (peer-reviewed)abstract
- Charged dust particles are theoretically expected to modify the amplitude and spectrum of plasma fluctuations, and this can eventually provide novel diagnostic tools. Direct experimental evidence of the effects of dust particles on the fluctuations of a low collisionality plasma is reported, in agreement with the expectations of kinetic theory.
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