Relations between light emission and electron density and temperature fluctuations in a helium plasma

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dc.contributor.authorMa, Shuiliang
dc.contributor.authorHoward, John
dc.contributor.authorThapar, Nandika
dc.date.accessioned2015-12-08T01:33:30Z
dc.date.available2015-12-08T01:33:30Z
dc.date.issued2011-08-11
dc.date.updated2016-02-24T11:18:37Z
dc.description.abstractThe relations between three atomic lines, He I 667.8 nm (3¹ D → 2¹ P), 706.5 nm (3³ S → 2³ P), and 728.1 nm (3¹ S → 2¹ P), and the underlying fluctuations in a helium plasma are investigated for the quantitative interpretation of optical observations in plasma fluctuationmeasurements. Frequency dependent fluctuation amplitude ratios and phase delays between the line emission fluctuation and the electron density and temperaturefluctuations are calculated based on a quasi-static collisional-radiative model and a linear approximation technique. For frequencies up to the upper limit of practical interest (<1 MHz), the fluctuation amplitude ratios and phase delays are similar to those directly evaluated by the quasi-static model. It is found that the difference between the results from the linear approximation technique and from the quasi-static model is due to the absence of metastable fluctuations. Contributions of the 2¹ S and 2³ S metastable fluctuations to the three helium line emission fluctuations are analyzed. The linearity between fluctuations in the line emission and in the electron density and temperature is valid for fluctuation levels higher than 10%.
dc.identifier.issn1070-664Xen_AU
dc.identifier.urihttp://hdl.handle.net/1885/28552
dc.publisherAmerican Institute of Physics (AIP)
dc.rightshttp://www.sherpa.ac.uk/romeo/issn/1070-664X..."Publishers version/PDF may be used on author's personal website, institutional website or institutional repository" from SHERPA/RoMEO site (as at 8/12/15). Copyright 2011 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Physics of Plasmas and may be found at https://doi.org/10.1063/1.3620403
dc.sourcePhysics of Plasmas
dc.subjectKeywords: Amplitude ratios; Atomic lines; Collisional radiative model; Frequency dependent; Helium lines; Helium plasmas; Line emissions; Linear approximations; Optical observations; Phase delay; Plasma fluctuations; Quantitative interpretation; Quasi-static; Quasi
dc.titleRelations between light emission and electron density and temperature fluctuations in a helium plasma
dc.typeJournal article
local.bibliographicCitation.issue8en_AU
local.bibliographicCitation.lastpage14
local.bibliographicCitation.startpage083301en_AU
local.contributor.affiliationMa, Shuiliang (Sean), College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Plasma Research Laboratory, The Australian National Universityen_AU
local.contributor.affiliationHoward, John, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Plasma Research Laboratory, The Australian National Universityen_AU
local.contributor.affiliationThapar, Nandika, College of Physical and Mathematical Sciences, CPMS Research School of Physics and Engineering, Plasma Research Laboratory, The Australian National Universityen_AU
local.contributor.authoremailshuiliang.ma@anu.edu.auen_AU
local.contributor.authoruidU4830903en_AU
local.description.notesImported from ARIESen_AU
local.identifier.absfor020204en_AU
local.identifier.absseo970102en_AU
local.identifier.ariespublicationu4695161xPUB28en_AU
local.identifier.citationvolume18en_AU
local.identifier.doi10.1063/1.3620403en_AU
local.identifier.scopusID2-s2.0-80052423885
local.identifier.thomsonID000294486400063
local.identifier.uidSubmittedByu3488905en_AU
local.publisher.urlhttps://www.aip.org/en_AU
local.type.statusPublished Versionen_AU

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