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dc.contributor.advisorGentle, Kenneth W.en
dc.contributor.committeeMemberBengtson, Rogeren
dc.creatorSchmitt, Simon Christianen
dc.date.accessioned2012-11-08T19:01:28Zen
dc.date.accessioned2017-05-11T22:29:30Z
dc.date.available2012-11-08T19:01:28Zen
dc.date.available2017-05-11T22:29:30Z
dc.date.issued2012-08en
dc.date.submittedAugust 2012en
dc.identifier.urihttp://hdl.handle.net/2152/ETD-UT-2012-08-6204en
dc.descriptiontexten
dc.description.abstractThe focus of this work is the experimental investigation of electron velocity distribution functions in the plasma of the Texas Helimak experiment. Texas Helimak has a cylindrical geometry and relatively moderate plasma parameter, which allow the use of a retarding field analyzer that is located approximately in the middle of the vacuum vessel. Electron velocity distribution functions were measured for a variety of different operating conditions and for two gas species, namely argon and helium. Parameter scans, whereby all parameter except the scan parameter were kept constant, were done in order to investigate the influence of the scan parameter on the velocity distribution. It was found, that most electron velocity distribution functions are not alone Maxwellian. One of the reasons therefore is electron cyclotron resonance heating, which was used for ionizing and heating the plasma and what produces a suprathermal tail. It is possible, however, to obtain effective electron temperatures. These effective electron temperatures range from about 10 eV , what is similar to the electron bulk temperature, to more than 150 eV.en
dc.format.mimetypeapplication/pdfen
dc.language.isoengen
dc.subjectElectron velocity distributionen
dc.subjectHelimaken
dc.subjectRetarding field analyzeren
dc.titleExperimental investigation of electron velocity distribution functions in the UT Helimaken
dc.description.departmentPhysicsen
dc.type.genrethesisen
dc.date.updated2012-11-08T19:03:43Zen
dc.identifier.slug2152/ETD-UT-2012-08-6204en


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