Measurement and parameterization of sub-1 eV ion temperatures in a helium plasma confined by a magnetic mirror

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dc.contributor.authorKnott, Sean
dc.contributor.authorRuth, Albert A.
dc.contributor.authorMcCarthy, Patrick J.
dc.contributor.funderHorizon 2020en
dc.date.accessioned2021-11-15T11:49:05Z
dc.date.available2021-11-15T11:49:05Z
dc.date.issued2020-06-17
dc.date.updated2021-11-15T11:41:01Z
dc.description.abstractUsing a magnetic mirror plasma device, helium ion temperatures were investigated using high resolution Doppler spectroscopy of the He II line at 468.6 nm. The objective was to improve the quality of fits to Langmuir probe data. Measured temperatures, which represent an average value over a line of sight, ranged from 0.07 eV to 0.32 eV with higher values reached in stronger magnetic fields. An analytic expression for the line of sight integral of a variable width Gaussian signal is presented, and it is demonstrated that the integrated signal can, in practice, be accurately fitted by a single Gaussian line shape. A large number of spectra was acquired using a randomized experimental design with four independently controllable engineering variables and three discrete magnetic fields. Separate parameterizations of the results for each magnetic field in terms of the engineering variables showed that the data could already be well fitted using only the plasma current as a predictor. The fit to the ion temperature data was significantly improved when both the plasma current and filament bias voltage were used as predictors. The helium gas fill pressure had negligible predictive value for the ion temperature.en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.articleid025013en
dc.identifier.citationKnott, S., Ruth, A. A . and McCarthy, P. J. (2020) 'Measurement and parameterization of sub-1 eV ion temperatures in a helium plasma confined by a magnetic mirror', Plasma Research Express, 2(2), 025013 (11pp). doi: 10.1088/2516-1067/ab97f4en
dc.identifier.doi10.1088/2516-1067/ab97f4en
dc.identifier.endpage11en
dc.identifier.issn2516-1067
dc.identifier.issued2en
dc.identifier.journaltitlePlasma Research Expressen
dc.identifier.startpage1en
dc.identifier.urihttps://hdl.handle.net/10468/12214
dc.identifier.volume2en
dc.language.isoenen
dc.publisherIOP Publishingen
dc.relation.projectinfo:eu-repo/grantAgreement/EC/H2020::COFUND-EJP/633053/EU/Implementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium/EUROfusionen
dc.rights© 2020, IOP Publishing Ltd. This is an author-created, un-copyedited version of an article accepted for publication in Plasma Research Express. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at: https://iopscience.iop.org/article/10.1088/2516-1067/ab97f4en
dc.subjectIon temperatureen
dc.subjectSub-1eVen
dc.subjectMagnetic mirror plasmaen
dc.subjectDoppler spectroscopyen
dc.titleMeasurement and parameterization of sub-1 eV ion temperatures in a helium plasma confined by a magnetic mirroren
dc.typeArticle (peer-reviewed)en
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