DC FieldValueLanguage
dc.contributor.advisorLaimer, Johann-
dc.contributor.authorMaszl, Christian-
dc.date.accessioned2020-06-30T20:23:11Z-
dc.date.issued2008-
dc.date.submitted2008-01-
dc.identifier.urihttps://resolver.obvsg.at/urn:nbn:at:at-ubtuw:1-15282-
dc.identifier.urihttp://hdl.handle.net/20.500.12708/14033-
dc.description.abstractDirect current (DC) glow-discharges are well known today and in widespread use. However, there is less known about DC glow-discharges at high pressures. High pressure glow-discharges are interesting because expensive and maintenance-intensive vacuum equipment is not required. This fact allows minituarization of discharges for various applications. Main goal of this study was to investigate similarity ("scaling") laws for high pressure DC glow-discharges. Therefore, a high pressure chamber was constructed in order to observe glow discharges in a pressure range from 200 to 2000 hPa with inter-electrode gaps between 0.1 and 7 mm. Distances are adjusted with a micrometer-head. Both electrodes are water cooled to allow measurements at higher powers. The electrodes are replaceable to permit experiments with various electrode materials. Electrical characterisation of the discharge is accomplished by the determination of current-voltage (I-V) curves. Optical analyses are done with microscopes and spectrometers. Investigations on breakdown voltages were performed. It turned out that neither of the established formulas for the ignition potential is capable to fit the experimental data. The reduced normal current density for helium and copper was measured for the first time. Investigations on the pressure dependence of the positive column cross section and the temperature in the cathode fall region took place. I-V characterisation and measurements of the reduced field strength in the positive column of mathematically similar discharges were performed. The reduced thickness of a normal cathode sheath was measured for the first time for helium and tungsten. Finally, investigations on anode light spots and anode glows took place. Two different types of anode spots, ring-like structures and self-organised hexagonal structures were observed. Violations of the similarity laws are presented and the influence of gas heating on the discharge parameters in the high pressure case is demonstrated. Glow-discharges with operating voltages below the normal cathode fall voltage are presented. This work provides a broad overview of a variety of phenomena and a solid base for future research.de
dc.formatVIII, 200 S.-
dc.languageEnglish-
dc.language.isoen-
dc.subjectGleichstrom Glimmentladungde
dc.subjectÄhnlichkeitsgesetzede
dc.subjectPaschen-Kurvende
dc.subjectDurchmesser positive Säulede
dc.subjectreduzierte normale Stromdichtende
dc.subjectTemperatur Kathodenfallde
dc.subjectAnodenlichtpunktede
dc.subjectselbstorganisierte Strukturende
dc.subjectreduzierte Feldstärkende
dc.subjectHeliumde
dc.subjectdirect current glow-dischargeen
dc.subjectsimilarity lawsen
dc.subjectpaschen curvesen
dc.subjectpositive column cross sectionen
dc.subjectreduced normal current densityen
dc.subjecttemperature cathode fallen
dc.subjectanode light spotsen
dc.subjectself-organized structuresen
dc.subjectreduced field strengthen
dc.subjectheliumen
dc.titleInvestigations on high pressure direct current glow-dischargesen
dc.typeThesisen
dc.typeHochschulschriftde
tuw.publication.orgunitE134 - Institut für Allgemeine Physik-
dc.type.qualificationlevelDiploma-
dc.identifier.libraryidAC05036703-
dc.description.numberOfPages200-
dc.identifier.urnurn:nbn:at:at-ubtuw:1-15282-
dc.thesistypeDiplomarbeitde
dc.thesistypeDiploma Thesisen
item.fulltextwith Fulltext-
item.openairetypeThesis-
item.openairetypeHochschulschrift-
item.cerifentitytypePublications-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
Appears in Collections:Thesis

Files in this item:

Show simple item record

Page view(s)

13
checked on Feb 18, 2021

Download(s)

61
checked on Feb 18, 2021

Google ScholarTM

Check


Items in reposiTUm are protected by copyright, with all rights reserved, unless otherwise indicated.