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The finite probe size effect in fluctuation measurements; application to dusty plasmas
KTH, School of Electrical Engineering (EES), Space and Plasma Physics. Istituto Nazionale di Fisica Nucleare (INFN), Italy.ORCID iD: 0000-0001-9632-8104
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0002-6712-3625
2016 (English)In: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 82, no 2, 615820201Article in journal (Refereed) PublishedText
Abstract [en]

The effect of the finite probe size in plasma fluctuation measurements is revisited for dusty plasmas, where it has been argued that dust leads to a significant low-frequency enhancement in the spectral densities of ion density fluctuations, which can constitute the physical basis of a dust diagnostic technique. Theoretical predictions for the spectral modifications are presented and the dust acoustic mode contribution is analysed. The finite probe size effect is treated within the volume average approach, which introduces geometry dependent form factors that are calculated for spherical and cylindrical probes. The volume average approach is compared with the typically employed cutoff wavenumber approximation for various dust and plasma parameters. The contribution of temperature fluctuations to the spectral density of current fluctuations is also evaluated.

Place, publisher, year, edition, pages
Cambridge University Press, 2016. Vol. 82, no 2, 615820201
Keyword [en]
Dust, Plasma theory, Probes, Semiconductor plasmas, Spectral density, Current fluctuations, Diagnostic techniques, Dust acoustic modes, Dusty plasmas, Plasma fluctuations, Plasma parameter, Spectral modifications, Temperature fluctuation
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-187178DOI: 10.1017/S0022377816000271ISI: 000376015000011ScopusID: 2-s2.0-84963657374OAI: oai:DiVA.org:kth-187178DiVA: diva2:929334
Funder
Swedish Research Council
Note

QC 20160518

Available from: 2016-05-18 Created: 2016-05-18 Last updated: 2016-06-10Bibliographically approved

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Tolias, PanagiotisRatynskaia, Svetlana
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