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Dissertations / Theses on the topic 'Langmuir probe'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

Johansson, Fredrik. "Rosetta Langmuir probe performance." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-213146.

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Several Langmuir probe voltage sweeps by a model of the ESA spacecraft Rosetta was simulated in a plasma with solar wind parameters using the ESA open source software SPIS 5. The simulations were carried out to in- vestigate the features of the spacecraft’s environment in the solar wind and the effect of photoemission from the spacecraft surface on the measurements made by the Langmuir probes on board Rosetta. We report a best fit to an existing probe sweep result in the solar wind near the Earth at 1 AU from 9 Nov 2009 for a 4 million particle simulation in SPIS of an 8 V positively charged s

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2

Joyce, AÌine Mary. "A versatile Langmuir probe system." Thesis, University of Ulster, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268571.

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3

Johansson, Fredrik. "Numerical simulation of Rosetta Langmuir Probe." Thesis, Uppsala universitet, Rymd- och plasmafysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-206890.

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By modelling and simulating the ESA spacecraft Rosetta in a plasma with solar wind parameters, and simultaneously simulating a particle detection experiment of Langmuir probe voltage sweep type using the ESA open source software SPIS Science, we investigate the features of Rosetta’s envi- ronment in the solar wind and the e↵ect of photoemission from the space- craft on the measurements made by the Langmuir Probe instrument on board Rosetta. For a 10 V positively charged spacecraft and Maxwellian distributed photoelectron emission with photoelectron temperature, Tf = 2 eV in a plasma of typical

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4

Barjatya, Aroh. "Langmuir Probe Measurements In The Ionosphere." DigitalCommons@USU, 2007. https://digitalcommons.usu.edu/etd/274.

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Electric probes have been the primary instruments for the in situ investigation of plasma parameters in the Earth’s ionosphere. This dissertation is a compendium of three papers, each dealing with a separate spacecraft that carried one or more instruments based on the electric probe technique. The ﬁrst paper presents data from the Sudden Atom Layer sounding rocket that carried an RF Impedance Probe, a DC ﬁxed-bias Langmuir Probe (DCP), and an Electric Field Probe. The combined dataset indicates a case of payload surface charging, the causes of which are investigated within the paper. A generic

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5

Sinclair, Brian Collins. "Langmuir probe diagnostics of the VASIMR engine /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Dec%5FSinclair.pdf.

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6

Mefo, Jane Ebelechukwu. "Langmuir probe characterisation of ion source plasmas." Thesis, University of Surrey, 2005. http://epubs.surrey.ac.uk/843557/.

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The precise conditions under which ions are generated in the ion source can have a major impact on how well the source performs, and how much of the extracted beam current can be transported. Because of the commercial focus on the repeatability and reliability of the overall ion implantation process, this vital aspect of the machine has received little scientific attention. hi order to address this issue, detailed studies of both the source and beam plasmas have been initiated. The research described in this thesis, was concerned with the former, and the characterisation of boron trifluoride (

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7

Sinclair, Brian C. "Langmuir probe diagnostics of the VASIMR engine." Thesis, Monterey, California. Naval Postgraduate School, 2005. http://hdl.handle.net/10945/1821.

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NASAâ s VAriable Specific Impulse Magnetoplasma Rocket Engine (VASIMR) will provide a highly efficient propulsion source that can dramatically reduce Martian transit times, provide for more abort contingencies, and protect astronauts from space radiation with its highly radiation-absorbent hydrogen fuel. The VASIMR is still in its developmental infancy and requires many years of research before its initial operational capability. Much is still unknown about the complex plasma interactions in the exhaust. A Langmuir probe was designed, constructed, and operated to determine current density rad

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8

Suresh, Padmashri. "Surface Morphology Implications on Langmuir Probe Measurements." DigitalCommons@USU, 2011. https://digitalcommons.usu.edu/etd/902.

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Langmuir probes are extensively employed to study the plasmas in space and laboratory environments. Successful measurements require a comprehensive modeling of both the plasma environment and the probe conditions in the form of current collection models. In this thesis, the surface morphology implications on the probe current collection are investigated. This problem is applied and solved in the context of a CubeSat regime. The first problem that is investigated is the consequence of surface structural variability on the current measurements. A new model for dealing with non-uniformity of the

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9

McFarland, G. M. "Langmuir probe studies in a GEC Reference Reactor." Thesis, Queen's University Belfast, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395373.

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10

Fanara, C. "A Langmuir multi-probe system for the characterization of atmospheric pressure arc plasmas." Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/96.

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The 'high-pressure' atmospheric (TIG) arc plasma is studied by means of a multi-Langmuir probe system. In order to determine the appropriate regime of operation, definitions of the plasma parameters for the description of the argon arc are considered and evaluations are presented. A description of the probe basic techniques is followed by an in-depth discussion of the different regimes of probe operation. The emphasis is put on atmospheric and flowing (arc) regimes. Probe sheath theories are compared and “Nonidealities” like cooling due to plasma-probe motion and probe emission mechanisms are

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11

Anderson, Colin Andrew. "Temporal Langmuir probe measurements in low frequency RF plasmas." Thesis, University of Ulster, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359715.

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12

Chiaretta, Marco. "Numerical modelling of Langmuir probe measurements for the Swarm spacecraft." Thesis, Uppsala universitet, Rymd- och plasmafysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-148633.

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This work studies the current collected by the spherical Langmuir probes to be mounted on the ESA Swarm satellites in order to quantify deviations from idealized cases caused by non-ideal probe geometry. The ﬁnite-element particle-in-cell code SPIS is used to model the current collection of a realistic probe, including the support structures, for two ionospheric plasma conditions with and without drift velocity. SPIS simulations are veriﬁed by comparing simulations of an ideal sphere at rest to previous numerical results by Laframboise parametrized to sufﬁcient accuracy. It is found that for p

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13

Singh, Shailendra Vikram. "Investigation of ICP RF discharges by means of a Langmuir probe." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=974828998.

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14

Hånberg, Christian. "Analytic modelling of Rosetta Langmuir probe measurements based on SPIS simulations." Thesis, Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-149816.

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The Rosetta spacecraft is on route to rendezvous with the comet 67P/ Churyomov-Gerasimenko. One of the instruments onboard is the Langmuir probe instrument (LAP) developed by the Swedish Institute of Space Physics. The LAP includes two spherical probes used to measure a number of properties of the surrounding plasma. One measured property is the plasma density for which the spacecraft potential is a good proxy. By the determining the potential between spacecraft and Langmuir probe, the spacecraft potential can be measured. But such measurements are sometimes disturbed by the potential from the

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15

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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16

Eckman, Robert Francis. "Langmuir Probe Measurements in the Plume of a Pulsed Plasma Thruster." Digital WPI, 1999. https://digitalcommons.wpi.edu/etd-theses/1051.

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"As new, smaller satellites are built, the need for improved on-board propulsion systems has grown. The pulsed plasma thruster has received attention due to its low power requirements, its simple propellant management, and the success of initial flight tests. Successful integration of PPTs on spacecraft requires the comprehensive evaluation of possible plume-spacecraft interactions. The PPT plume consists of neutrals and ions from the decomposition of the Teflon propellant, material from electrode erosion, as well as electromagnetic fields and optical emissions. To investigate the PPT plum

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17

Byrne, Lawrence Thomas. "Langmuir probe measurements in the plume of a pulsed plasma thruster." Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-1219102-173938.

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Thesis (M.S.)--Worcester Polytechnic Institute.<br>Keywords: PPT; pulsed plasma thruster; Langmuir probe; plasma diagnostics; electric propulsion; electron temperature; electron density. Includes bibliographical references (p. 97-102).

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18

Gramin, Ava. "Analysis of Calibration and Surface Contamination on the Rosetta Langmuir Probe Instrument." Thesis, Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-317492.

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19

Johlander, Andreas. "Photoemission on the Rosetta spacecraft." Thesis, Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-188153.

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Rosetta is a European spacecraft that will rendevouz with andfollow the comet 67P/Churyumov-Gerasimenko from 2014 to 2015. Among other instruments are two Langmuir probes that measure certain plasma parameters. This study aims to describe the photoemssionon Rosetta and in particular on the Langmuir probes. More than 7800 bias voltage sweeps were analyzed and parameters such as photosaturationcurrent, spacecraft potential, photoelectron temperature and offset current were calculated from these sweeps. It is found that the photoemission is stronger on Probe 1 than Probe 2. The photosaturation cu

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20

Shebanits, Oleg. "Pre-biotic molecules and dynamics in the ionosphere of Titan : a space weather station perspective." Licentiate thesis, Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-248118.

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Saturn’s largest moon Titan (2575 km radius) is the second largest in the Solar system. Titan is the only known moon with a fully developed nitrogen-rich atmosphere with ionosphere extending to ~2000 km altitude, hosting complex organic chemistry. One of the main scientific interests of Titan’s atmosphere and ionosphere is the striking similarity to current theories of those of Earth ~3.5 billion years ago. The Cassini spacecraft has been in orbit around Saturn since 2004 and carries a wide range of instruments for investigating Titan’s ionosphere, among them the Langmuir probe, a “space weath

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21

Sawyer, Samuel Thomas. "Experimental Studies of Spacecraft Plasma Interactions: Facility Characterization and Initial Measurements." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/33714.

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The objectives of this thesis are to characterize the plasma environment of a new vacuum chamber facility at Virginia Tech and to perform initial measurements of plasma flow field for studying spacecraft-plasma interactions using this facility. An argon plasma environment was created using a hot filament cathode plasma source. Flange plates attached to the sides of the vacuum chamber were modified in order to attach various feedthroughs both now and in the future such that a probe array DAQ system could be used to expedite measurement and analysis. A Langmuir probe array was used to measure

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22

Asselin, Daniel Joseph. "Characterization of the Near-Plume Region of a Low-Current Hollow Cathode." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-theses/438.

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Electric propulsion for spacecraft has become increasingly commonplace in recent decades as designers take advantage of the significant propellant savings it can provide over traditional chemical propulsion. As electric propulsion systems are designed for very low thrust, the operational time required over the course of an entire mission is often quite long. The two most common types of electric thrusters both use hollow cathodes as electron emitters in the process of ionizing the propellant gas. These cathodes are one of the main life-limiting components of both ion and Hall thrusters designe

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23

Holmberg, Madeleine. "Determination of Solar EUV Intensity and Ion Flux from Langmuir Probe Current Characteristics." Thesis, Uppsala University, Department of Physics and Astronomy, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-114460.

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<p>This report presents a model to determine the solar Extreme UltraViolet (EUV) intensity and the ion flux in the vicinity of Saturn, by using measurements from the Langmuir probe, a plasma investigation instrument, of the Cassini satellite. The model is based on in situ measurements and does therefore provide an improved estimation of the wanted parameters compared to previously used calculations based only on the EUV flux measured near Earth. The solar EUV and ion flux were determined by analysing and processing the current measurements from the Cassini Langmuir probe in several steps. Init

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24

Zwahlen, Jurg C. "Investigation of a Pulsed Plasma Thruster Plume Using a Quadruple Langmuir Probe Technique." Digital WPI, 2003. https://digitalcommons.wpi.edu/etd-theses/33.

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The rectangular pulsed plasma thruster (PPT) is an electromagnetic thruster that ablates Teflon propellant to produce thrust in a discharge that lasts 5-20 microseconds. In order to integrate PPTs onto spacecraft, it is necessary to investigate possible thruster plume-spacecraft interactions. The PPT plume consists of neutral and charged particles from the ablation of the Teflon fuel bar as well as electrode materials. In this thesis a novel application of quadruple Langmuir probes is implemented in the PPT plume to obtain electron temperature, electron density, and ion speed ratio measurement

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25

Zwahlen, Jurg C. "Investigation or a pulsed plasma thruster plume using a quadruple Langmuir probe technique." Link to electronic thesis, 2003. http://www.wpi.edu/Pubs/ETD/Available/etd-0108103-143841.

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26

Callaway, Martin James. "Thin films of flexible chain molecules." Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.307080.

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27

Shebanits, Oleg. "Determination of Ion Number Density from Langmuir Probe Measurements in the Ionosphere of Titan." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-132567.

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Saturn’s largest moon, Titan, presents a very interesting subject for study because of its atmosphere’s complex organic chemistry. Processes taking place there might shed some light on the origins of organic compounds on Earth in its early days. The international spacecraft Cassini-Huygens was launched to Saturn in 1997 for a detailed study of the gas giant and its moons, specifically Titan. The Swedish Institute of Space Physics in Uppsala has manufactured the Langmuir probe instrument for the Cassini spacecraft now orbiting Saturn, and is responsible for its operation and data analysis. This

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28

Wantock, Thomas. "Thrust balance performance characterisation and internal Langmuir probe plasma diagnostics for a Halo thruster." Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/845862/.

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Electric Propulsion (EP) systems can enable novel spacecraft missions requiring high total change in velocity, owing to their high specific impulse compared to chemical propulsion systems. Mature devices, such as Hall Effect Thrusters (HETs), have accumulated significant flight heritage. How- ever, established technologies do not satisfy the requirements of the rapidly growing small satellite sector, because of adverse scaling to low powers. The Halo thruster concept falls within the cat- egory of Cusped Field Thrusters (CFTs), aimed at addressing this issue. The concept concerns the use of ‘m

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29

Auman, Andrew Jay. "The Adaptability of Langmuir Probes to the Pico-Satellite Regime." DigitalCommons@USU, 2008. https://digitalcommons.usu.edu/etd/165.

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The purpose of this thesis is to investigate whether it is feasible to use Langmuir probes on pico-satellites flying in low Earth orbit over mid- to low-latitude geographic regions. Following chapters on the expected ionospheric conditions and an overview of Langmuir probe theory, a chapter addressing the difficulties involved with pico-satellite Langmuir probes is presented. Also, the necessary satellite-to-probe surface area requirements in order to achieve confidence in pico-satellite Langmuir probe data, for the orbital regions of interest to this thesis, are stated.

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30

Lyons, Laurence Anthony. "Construction and operation of a Mirror Langmuir Probe diagnostic for the Alcator C-Mod tokamak." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40321.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (p. 119-120).<br>Langmuir probe diagnostic systems presently employed on Alcator C-Mod and elsewhere generally suffer from a severe limitation: unless multiple electrode or high-frequency bias techniques are employed, these systems can not resolve the rapid changes in plasma electron temperature,

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31

Partridge, James Michael. "Development and Implementation of diagnostics for unsteady small-scale plasma plumes." Worcester, Mass. : Worcester Polytechnic Institute, 2009. http://www.wpi.edu/Pubs/ETD/Available/etd-011409-150444/.

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Dissertation (Ph.D.)--Worcester Polytechnic Institute.<br>Keywords: TLP; RPA; retarding potential analyzer; triple Langmuir Probe; plume; probe; diagnostic; thruster; Plasma. Includes bibliographical references (leaves 183-190).

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32

Zechar, Nathan E. "Experimental Investigation of a Parametric Excitation of Whistler Waves." Wright State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=wright1495802386539665.

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33

Usoltceva, Mariia. "Advancements in Langmuir probe diagnostic for measurements in RF sheath and in modelling of the ICRF slow wave." Electronic Thesis or Diss., Université de Lorraine, 2019. http://www.theses.fr/2019LORR0061.

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Injecter de la puissance au plasma avec les ondes au voisinage de la fréquence cyclotron ionique (ICRF) est une technique prometteuse pour chauffer les plasmas de tokamak aux températures de fusion requises. Pour le rendement élevé, l'antenne ICRF doit être placée à proximité du plasma, mais ils accroissent les interactions plasma-paroi néfastes. Les ions accélérés par le champ électrique dans la gaine radiofréquence (RF) se sont avérés être à l'origine de ces interactions. La conception de l'antenne ICRF pourrait être optimisée pour réduire les effets observés. Ces études peuvent être réalisé

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34

Kubic, Martin. "Étude expérimentale d'interactions entre antennes HF et plasma périphérique d'un Tokamak." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0220/document.

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Les antennes en opération dans la gamme de fréquence cyclotron ionique représentent un moyen utile pour chauffer du plasma dans les tokamaks et autres plasmas de fusion. Ces systèmes de chauffage sont amenés à jouer un rôle important dans le projet ITER. Conjointement avec le chauffage souhaité, les interactions parasites avec le bord du plasma et de la limite des matériaux apparaissent. Plusieurs de ces effets délétères sont causés par la formation de la radio-fréquence des gaines. L'objectif de cette thèse est d'étudier, principalement de façon expérimentale, les modifications du plasma de b

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35

Grenfell, Gustavo Guedes. "Estudo de efeitos da polarização eletrostática periférica no Tokamak TCABR." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-03062016-110840/.

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Efeitos da polarização eletrostática de eletrodos na periferia de tokamaks têm sido investigados em pequenos tokamaks e mesmo em alguns tokamaks de grande porte. Em geral as experiências são realizadas em condições em que bifurcação do campo elétrico radial é obtida, processo este identificado como modo H de polarização. No Tokamak TCABR, as experiências indicam que o confinamento aumenta para tensões aplicadas até +300 volts, atingindo um máximo de duas vezes o tempo de confinamento do modo L, mas sem bifurcação. Indícios de bifurcação foram notados com +400 V de polarização, mas a descarga

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36

Taillefer, Zachary R. "Characterization of the Near Plume Region of Hexaboride and Barium Oxide Hollow Cathodes operating on Xenon and Iodine." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-dissertations/44.

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The use of electric propulsion for spacecraft primary propulsion, attitude control and station-keeping is ever-increasing as the technology matures and is qualified for flight. In addition, alternative propellants are under investigation, which have the potential to offer systems-level benefits that can enable particular classes of missions. Condensable propellants, particularly iodine, have the potential to significantly reduce the propellant storage system volume and mass. Some of the most widely used electric thrusters are electrostatic thrusters, which require a

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37

Behlman, Nicholas James. "Electron Energy Distribution Measurements in the Plume Region of a Low Current Hollow Cathode." Digital WPI, 2010. https://digitalcommons.wpi.edu/etd-theses/72.

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A hollow cathode is an electron source used in a number of different electric thrusters for space propulsion. One important component of the device that helps initiate and sustain the discharge is called the keeper electrode. Cathode keeper erosion is one of the main limiting factors in the lifetime of electric thrusters. Sputtering due to high-energy ion bombardment is believed to be responsible for keeper erosion. Existing models of the cathode plume, including the OrCa2D code developed at Jet Propulsion Laboratory, do not predict these high-energy ions and experimental measurement of the el

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38

Zang, Linge. "Study on Edge Fluctuation of Supersonic Molecular-Beam Fueled Plasmas Using Langmuir probes and Fast Cameras in Heliotron J." Kyoto University, 2014. http://hdl.handle.net/2433/188823.

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39

Odelstad, Elias. "Rosetta spacecraft potential and activity evolution of comet 67P." Licentiate thesis, Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-294395.

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The plasma environment of an active comet provides a unique setting for plasma physics research. The complex interaction of newly created cometary ions with the flowing plasma of the solar wind gives rise to a plethora of plasma physics phenomena, that can be studied over a large range of activity levels as the distance to the sun, and hence the influx of solar energy, varies. In this thesis, we have used measurements of the spacecraft potential by the Rosetta Langmuir probe instrument (LAP) to study the evolution of activity of comet 67P/Churyumov-Gerasimenko as it approached the sun from 3.6

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40

Ronchi, Gilson 1985. "Estudos de descargas de plasma contínuas." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278560.

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Orientador: Munemasa Machida<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-19T18:26:47Z (GMT). No. of bitstreams: 1 Ronchi_Gilson_M.pdf: 6202845 bytes, checksum: e9580b7846e57a9eb526cdf45b808564 (MD5) Previous issue date: 2012<br>Resumo: O conhecimento das condições para ruptura de gases e a formação de plasma são questões importantes, não apenas de interesse fundamental, mas também para muitas aplicações, tais como em deposição de filmes finos de óxido ou polímeros, limpeza de superfície de materiais o

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Scharlemann, Carsten A. "Investigation of thrust mechanisms in a water fed pulsed plasma thruster." The Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1070354149.

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42

Welzel, Thomas. "Time-resolved characterisation of pulsed magnetron discharges for the deposition of thin films with plasma diagnostic methods." Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-81968.

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Research on the characterisation and understanding of pulsed magnetron discharges used for the deposition of thin, especially dielectric, films has been carried out between 2003 and 2008 at Chemnitz University of Technology. This thesis is a collection and summary of the original research during this period. In the main part of the thesis, work published in peer-reviewed scientific papers is summarised and yet unpublished results are given in more detail. Different aspects highlighted in the publications are described in a general context of the characterisation of the pulsed discharges for th

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Welzel, Thomas. "Time-resolved characterisation of pulsed magnetron discharges for the deposition of thin films with plasma diagnostic methods." Doctoral thesis, Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-201000922.

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Research on the characterisation and understanding of pulsed magnetron discharges used for the deposition of thin, especially dielectric, films has been carried out between 2003 and 2008 at Chemnitz University of Technology. This thesis is a collection and summary of the original research during this period. In the main part of the thesis, work published in peer-reviewed scientific papers is summarised and yet unpublished results are given in more detail. Different aspects highlighted in the publications are described in a general context of the characterisation of the pulsed discharges for th

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44

Colin, Clothilde. "Turbulent transport modeling in the edge plasma of tokamaks : verification, validation, simulation and synthetic diagnostics." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4350/document.

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La possibilité de produire de l'énergie en utilisant la fusion par confinement magnétique est un défi scientifique et technologique. La perspective d'ITER transmet des signaux forts afin d'intensifier les efforts de modélisation pour les plasmas de fusion. Le succès de la fusion est conditionnée par la qualité du confinement du plasma dans le cœur du réacteur et par le contrôle des flux de particules et de chaleur qui arrivent sur la paroi. Les deux phénomènes sont liés au transport turbulent. L'étude de ces phénomènes est d'autant plus compliquée que la géométrie magnétique est complexe. Cela

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Akbar, Demiral Salih. "The Non-uniform Argon Dc Glow Discharge System Parameters Measured With Fast Three Couples Of Double Probe." Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607109/index.pdf.

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The non-uniform dc glow discharge plasma system is studied by using isolated computer controlled three couples of double probe system (TCDP) in argon gas, simultaneously. TCDP system has been developed to use for magnetized, unmagnetized, and for low oscillating plasma systems by using low pass filter with optically isolated circuitry to minimize the measurement errors with higher resolution and accuracy. Difference in the shapes and diameters of the discharge tube from region to region leads to change in the positive column glow discharge properties. This is because the positive column inhomo

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Milligan, David J. "The baffle aperture region of an ion thruster." Thesis, University of Southampton, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342779.

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Bause, Marlon Luis. "Plasma density characteristics of magnetic holes near the Kronian magnetosphere boundary surfaces." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-414766.

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Localized structures of the magnetic field strength depression are often observed in the interplanetarymedium, and they are called ‘magnetic holes’ after the original work of Turner et al. 1977. A numberof observations of similar features have been reported, while the mechanisms of their origin have notfully understood yet. The scale size of their structures varies from several to a few thousand of the protongyro radii, and their characteristic orientations of the magnetic field also vary, and therefore differenttypes of the magnetic holes have been suggested. To date, the magnetic holes are c

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Dagtekin, Ebru. "Measurement Of Nonuniform Magnetized Argon Plasma Discharge Parameters." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607934/index.pdf.

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Effects of a magnetic field on the double-probe technique are studied experimentally by means of symmetric floating computer controlled fast double probes in low and intermediate pressure plasmas. In addition, the effects of the magnetic field on the electron temperature, electron density, and electric field have been investigated. As it is expected, when there is no magnetic field, properties of the discharge plasma are best described by Langmuir theory. Whereas, when there&rsquo<br>s a magnetic field of sufficient strength Schottky&rsquo<br>s theory of ambipolar diffusion applies.

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Alami, Jones. "Plasma Characterization & Thin Film Growth and Analysis in Highly Ionized Magnetron Sputtering." Doctoral thesis, Linköping : Dept. of Physics and Measurement Technology, Univ, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-4147.

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Ågren, Karin. "On the Formation and Structure of the Ionosphere of Titan." Doctoral thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-172148.

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We present results on the ionospheric structure around Titan observed during numerous deep (<1000 km) flybys by the Cassini spacecraft. Our results are based on measurements by the radio and plasma wave science instrument, in particular the Langmuir probe. In addition, data from the magnetometer and electron spectrometer have contributed. The ionosphere of Titan is created when the atmosphere of the moon becomes ionised. There are several mechanisms that contribute to this, the most important of which are considered to be photoionisation by EUV from the Sun with associated photoelectron ion

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