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Dissertations / Theses on the topic 'Gas discharge physics'

Author: Grafiati

Published: 4 June 2021

Last updated: 4 February 2022

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1

Ingram, S. G. "Investigations of low pressure RF discharges in argon." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.480534.

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2

Goruppa, Alexander. "Modifications of radiofrequency capacitive discharge for deposition of carbon coatings." Thesis, Open University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251396.

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3

Vigstrand, Oscar. "Development of an absorption model for gas discharge lamp simulation." Thesis, Malmö universitet, Malmö högskola, Institutionen för materialvetenskap och tillämpad matematik (MTM), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-42518.

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Ultraviolet (UV) light has been used for disinfection purposes for over 100 years. Irradiation by UV light is a method to disinfect surfaces in order to prevent microbiological growth. At Tetra Pak this is of great importance as they are manufacturer of filling machines. Those filling machines must ensure a certain level of sterility on all packages produced. The irradiation process can be simulated using Geant4 which is a software package that tracks particles through matter. The simulation model used today does not consider the absorption of photons inside of medium-pressure UV lamps. By und

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4

Barrios, Andrés J. "Yield of metastable atoms from a rare gas discharge in a longitudinal magnetic field." FIU Digital Commons, 1993. http://digitalcommons.fiu.edu/etd/1415.

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Atomic beam experiments are limited by intensity. Intensity limitations are specially critical in the measurements of metastable atoms, since their relative population is several order of magnitude smaller than the beam population. This thesis provides a method for increasing the intensity of metastable argon and neon beams effusing from a hot cathode, glow discharge by use of a longitudinal magnetic field. The argon and neon metastable atom intensities have been measured for a range of discharge pressure, voltage, and current for a magnetic field strengths from 0 to 31 mT. For both argon and

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5

Kemaneci, Efe H. "Numerical Investigation Of A Dc Glow Discharge In An Argon Gas: Two-component Plasma Model." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610917/index.pdf.

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This thesis deals with a one and two dimensional numerical modeling of a low-pressure DC glow discharge in argon gas. We develop two-component fluid model which uses the diffusion-drift theory for the gas discharge plasma and consists of continuity equations for electrons and ions, as well as Poisson equation for electric field. Numerical method is based on the control volume technique. Calculations are carried out in MATLAB environment. Computed results are compared with the classic theory of glow discharges and available experimental data.

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6

Eylenceoglu, Ender. "Numerical Investigation Of Self-organization And Stable Burning Conditions Of Moderate Pressure Glow Discharges In Argon Gas." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613634/index.pdf.

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In this study numerical modelling of a moderate pressure DC glow discharge plasma is car- ried out in 1D and 2D geometry. The governing equations include continuity equations for the plasma species (electrons, positive ions and metastable atoms), the electron energy equation (EEE), Poisson equation for the electric

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7

Sanabria, Edgar Rodolfo Rondán. ""Teoria e modelamento computacional de aquecimento de plasma por ondas de alfvén no tokamak TCABR"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-20102006-111511/.

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Neste trabalho apresentamos o estudo da possivilidade de melhores regimes para o uso dos experimentos de aquecimento e geracao de corrente e fluxo de plasma no tokamak TCABR. Apresentamos um estudo dos efeitos de rotacao de plasma em baixa frequencia (low-frequency (LF)), penetração de campo eletromagnético, absorção e forças ponderomotoras no Tokamak Chauffage Alfvén Brésilien (TCABR) com ênfase na faixa de frequências de 0, 510, 0kHz. Os campos de LF são dirigidos pelo limitador magnético ergódico (ergodic magnetic limiter (EML)) no TCABR. Foi feito um estudo analítico das ondas de Alfvén

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8

Malik, N. K. "Studies in vacuum discharges." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370286.

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9

Chen, Bing-Hung. "Inductively coupled radio-frequency discharges." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244566.

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10

Woodcock, Benjamin Kane. "Spectroscopic studies of RF glow discharges." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318464.

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11

Maciel, H. S. "Double layers in mercury arc discharges." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355761.

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12

Moss, Graham James. "A time-dependent collisional-radiative model of low pressure gas discharges." Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269399.

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13

Al-Jibouri, Abdul-Rahman Mohammed Abdul-Muhsen. "Photodetachment studies of negative hydrogen ion in discharges." Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264011.

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14

Ford, Michael John. "Fundamental studies of mixed gas plasmas in ICP-MS." Thesis, University of Plymouth, 1993. http://hdl.handle.net/10026.1/1941.

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Inductively coupled plasma - mass spectrometry is widely accepted as the leading technique for trace element analysis. It suffers however, from a range of interferences both spectral and non - spectral which limit the range of analytes and substrates which may be successfully analyzed. This study has investigated the use of mixed gas plasmas as a means of reducing or removing these interference effects. In addition the use of mixed gas plasmas for sensitivity enhancement has been assessed using both wet and dry sample introduction systems. Simplex optimization procedures have been used through

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15

Yuan, Qiulin. "Studies of electric discharges and their interactions with gases." Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/22086.

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Measurements of the effect of increasing the discharge column voltage gradient were investigated using argon based mixtures with nitrogen, oxygen and sulphur hexafluoride in a plasma torch. The theoretical calculation of the voltage gradient and the electron number density was based on the Saha equation which was modified for application to the gas mixtures. The investigations showed that a mixture of Ar and SF6 was most effective and increased the voltage gradient to 0.5 V/mm from 0.3 V/mm. The best mixture was 89% Ar, 10% N2 , 1% SF6 based on the highest increase of the voltage gradient and

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16

Coumar, Sandra. "Etude des mécanismes physiques induits pas un actionneur plasma appliqué au contrôle d’écoulements raréfiés super/hypersoniques dans le cadre de rentrées atmosphériques." Thesis, Orléans, 2017. http://www.theses.fr/2017ORLE2025/document.

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Ces dernières années, les missions spatiales bénéficient d'un regain d'intérêt. Cependant, lorsqu’arrive laphase d’entrée dans l’atmosphère, nous faisons encore face à d’importantes difficultés. Afin de répondre àce problème, une nouvelle technique est proposée : le contrôle par plasma pour augmenter la force detraînée sur le véhicule et ainsi, décroître sa vitesse. Dans cette thèse, un actionneur plasma est testé danstrois écoulements supersoniques (N1(M2-8Pa), N2(M4-8Pa) and N3(M4-71Pa)) et un hypersonique (M20-0.062Pa), ces écoulements étant simulés par la soufflerie MARHy.L’actionneur plas

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17

Preston, Stephen Gareth. "Investigations of short-pulse ultraviolet laser interactions with gas targets." Thesis, University of Oxford, 1995. https://ora.ox.ac.uk/objects/uuid:10c12437-3d88-4166-aa34-540b938f61bd.

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This thesis presents investigations of interactions of a 380 fs, 248.6 nm KrF laser beam focused to intensities up to 10<sup>18</sup> W/cm<sup>2</sup> with gas targets of Helium and Neon. At these intensities, the targets are rapidly ionised by the process of optical field ionisation. The purpose of these investigations is two-fold. Firstly, we determine the relative importance of plasma heating mechanisms and investigate the scaling of electron temperature with density to ascertain whether an optically-ionised XUV recombination laser, utilising the 3s-2p transition in a Lithium-like ion, is v

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18

Richardson, I. M. "Properties of the constricted gas tungsten (plasma) welding arc at elevated pressures." Thesis, Cranfield University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280909.

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19

Stenton, J. A. C. "A study for a high power millimetric-wave gyrotron." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355863.

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20

Najmundin, Zulfikar. "Parametric instabilities in the interaction of high intensity short pulse lasers with underdense plasmas." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339173.

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21

Dunne, Anthony Michael. "Measurements of thermal and radiation energy transport in laser and soft X-ray heated targets." Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336433.

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22

Sharma, Atul Stefan. "Tokamak modelling & control." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.270120.

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23

Tabasso, Alberto. "Spatially resolved measurement of photon fluxes from the JET divertor on the visible range." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286688.

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24

Zradokovic, David. "Theoretical studies of the effect of radial dynamics on Z pinch stability." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251578.

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25

Kingham, Robert Joseph. "High intensity short-pulse laser-plasma interactions." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267882.

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26

Tatarakis, Michael. "Optical probing of dense z-pinch and laser produced plasmas." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267298.

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27

Botha, Gert Johannes Jacobus. "A two-dimensional simulation of electrostatic drift wave turbulance in plasmas." Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265065.

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28

Counsell, G. F. "Ionisation mechanisms in an optically pumped mercury vapour plasma." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253318.

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29

Howling, A. A. "Fluctuations in the edge plasma of the TOSCA tokamak." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370261.

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30

Bennett, Guy Richard. "Inertially-confined laser-produced partially-degenerate strongly-coupled plasmas." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282411.

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31

Sucksmith, John Peter. "Studies of plasmas used for semiconductor etching." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335818.

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32

Vayakis, George. "Anomalous transport in the tokamak edge." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.291539.

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33

Mynors, Diane Julie. "Modelling of volume ion sources." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333192.

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34

Rossi, Adriana M. T. "Plasma particle balance and analysis of the gas released from the JET tokamak vessel." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284465.

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35

Graneau, P. Neal. "Ion dynamics of diffuse vacuum arcs." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306534.

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36

Darke, Susan A. "A study of solid sample introduction methods for inductively coupled plasma spectrometry." Thesis, Loughborough University, 1989. https://dspace.lboro.ac.uk/2134/10367.

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The development of sample introduction techniques for solid materials is a desirable goal in analytical atomic spectrometry. Traditional techniques have involved the introduction of samples as liquids by processes such as nebulisation. However some solid materials are not readily amenable to dissolution procedures and for the determination of elements at the ultra-trace level the reagents used for dissolution may produce undesired contamination. An additional problem for such determinations is that the dissolution process- may dilute the sample below the level which can be measured by the sele

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37

Davies, Peter George. "Charge exchange in ion-atom collisions relevant to fusion plasma diagnostics." Thesis, Durham University, 1998. http://etheses.dur.ac.uk/4740/.

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Total charge exchange and excitation cross-sections are presented for collisions between He(^2+) ions and helium atoms, the laboratory frame collision energy being in the range 16-800keV. Cross-sections from the helium ground state and the He(ls2s(^1)S) and He(ls2s(^3)S) metastable states are calculated. The calculations were performed using the semiclassical impact parameter model where wave-functions are expressed as an expansion of two-electron atomic basis states. Transfer channels included plane-wave translation factors. The transition He(^+)(n = 4) → He(^+)(n = 3) results in the emission

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38

Monk, Raymond David. "Langmuir probe measurements in the divertor plasma of the JET tokamak." Thesis, Royal Holloway, University of London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336515.

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This thesis describes the design and application of a new array of Langmuir probes to measure the plasma parameters in the divertor region of the Joint European Torus (JET) tokamak. A novel probe tip design was developed to withstand the high heat fluxes in the divertor region following thermal analysis and beam tests to identify the most suitable material. The probes operate in the "very strong magnetic field" regime with a large projected area (4mm2) and incidence angle to the magnetic field (> 10°) to avoid the sheath expansion effects associated with flush mounted divertor probes. The prob

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39

O'Connor, Gavin Thomas. "Development of a low pressure-inductively coupled plasma-ion source for mass spectrometry." Thesis, University of Plymouth, 1998. http://hdl.handle.net/10026.1/1764.

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A low pressure-inductively coupled plasma (LP-ICP) ion source has been investigated for the production of atomic and molecular ions for mass spectrometry (MS). A dedicated LPICP- MS was constructed, by modifying a Hewlett Packard mass selective detector, to detect ions from the LP-ICP. The ion sampling interface and ion optics were designed using established theory and the use of a computer simulation program. Perfluorotributylamine was continuously introduced into the LP-ICP, via a molecular leak, and the ion sampling interface, plasma forward power, and plasma gas flow rates, were optimised.

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40

Qayyum, Asif. "Preparation and characterisation of plasma CVD a-Si:C:H alloys for solar cells." Thesis, Heriot-Watt University, 1989. http://hdl.handle.net/10399/951.

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41

Burke, P. E. "A study of microwave induced plasmas." Thesis, London Metropolitan University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376442.

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42

Hocking, Matthew James. "An advanced wide bandwidth ultrasound absorption and velocity spectrometer for industrial applications." Thesis, Keele University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319023.

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43

Shard, Alexander Gordon. "Plasma assisted thin film formation." Thesis, Durham University, 1992. http://etheses.dur.ac.uk/5736/.

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Thin films of fluorocarbon-based polymers can be deposited by plasma assisted polymerisation of various perfluorocarbons. The chemical natures of plasma polymers of hexafluoropropene and perfluorohexane were examined as a function of power, flow rate and position in reactor. Polymerised hexafluoropropene displayed increased fluorine contents at high powers; this is at odds with perfluorohexane which demonstrated lower fluorine contents. Differing reaction mechanisms between saturated and unsaturated perfluorocarbons were proposed to explain this. Both perfluorocarbons were found to give increa

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44

Till, Clare. "An investigation of plasma polymerization and copolymerization using fluoroaromatic compounds." Thesis, Durham University, 1986. http://etheses.dur.ac.uk/6834/.

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The work detailed in this thesis concerns polymers synthesised by R.F. inductively coupled plasmas excited in fluorine containing monomer vapours. The structure and bonding in a series of polymers prepared from per-fluoroaromatic monomers by plasma polymerization was investigated by ESCA. The composition and structural features of these films were compared and contrasted with each other and with plasma polymers derived from the same parent compounds with lower degrees of fluorination. Critical emission spectra, ~260-600nm, from these plasmas were recorded and a correlation made between certain

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45

Mollart, T. P. "Electron emission processes in cold cathode thermal arcs." Thesis, Durham University, 1993. http://etheses.dur.ac.uk/5546/.

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In this Thesis the processes of electron emission from cathode electrodes are studied theoretically, and the applicability of these mechanisms to the non refractory cathodes that can be used to sustain thermal arcs was examined. Apparatus that was used to generate and manipulate thermal arcs along rail electrodes is described in this thesis. Techniques for driving arcs over polished sample electrodes with magnetic or aerodynamic forces are outlined. Scanning electron microscopy was used to study emission site formation on highly polished electrodes with a natural 2.5 nm oxide layer. Theoretica

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46

Phillips, M. E. "Studies of high temperature laboratory and astrophysical plasmas." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252580.

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47

Hughes, Ian G. "Electron ion and ion-ion collisions." Thesis, Queen's University Belfast, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335410.

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48

Cheshire, Roisin Christine. "Atomic hydrogen density measurements in diamond film producing plasmas." Thesis, Queen's University Belfast, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282126.

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49

McCann, S. M. "Spectroscopic diagnostics for high temperature astrophysical and laboratory plasmas." Thesis, Queen's University Belfast, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335434.

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50

Coffey, Ivor H. "Studies of K and L shell spectra of impurity ions in tokamak plasmas." Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333781.

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