Дисертації з теми "Plasma distribution function"
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Harada, Yuki. "Interactions of Earth's Magnetotail Plasma with the Surface, Plasma, and Magnetic Anomalies of the Moon." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188495.
Повний текст джерелаMukhopadhyay, Amit Kumar. "Statistics for motion of microparticles in a plasma." Diss., University of Iowa, 2014. https://ir.uiowa.edu/etd/1369.
Повний текст джерелаBehlman, 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.
Повний текст джерелаMontello, Aaron David. "Studies of Nitrogen Vibrational Distribution Function and Rotational-Translational Temperature in Nonequilibrium Plasmas by Picosecond Coherent Anti-Stokes Raman Scattering Spectroscopy." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1345522814.
Повний текст джерелаLi, Chun. "Measurement and understanding the residual stress distribution as a function of depth in atmosphere plasma sprayed thermal barrier coatings." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/measurement-and-understanding-the-residual-stress-distribution-as-a-function-of-depth-in-atmosphere-plasma-sprayed-thermal-barrier-coatings(e4dd38cc-2800-4719-bfe5-cccd0d6ff8c8).html.
Повний текст джерелаLunt, Tilmann. "Experimental investigation of the plasma-wall transition." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2008. http://dx.doi.org/10.18452/15837.
Повний текст джерелаIn the present work the streaming behavior of a magnetized argon plasma impinging on a neutralizing surface was investigated. For that purpose the ion velocity distribution was measured non-invasively as a function of the distance to the surface by means of Laser Induced Fluorescence. The spatial resolution was typically dz=0.5 mm. Two situations are investigated, (a): when practically the whole plasma streams onto a large target (diameter 100 mm), and (b): when the size of the target (diameter 15 mm) is significantly smaller than the diameter of the plasma column. In both cases the streaming velocity u was at least as high as the ion acoustic sound speed, as already predicted by Bohm in 1949. Under fusion relevant conditions this is the first direct observation of the Bohm criterion. Approaching the target surface the Mach number M=u/c_s increases from values of around 0.5 to 1 on typical scales of lambda_a=30 mm and lambda_b=5 mm, respectively. In order to explain these very short scale lengths the measured data were compared with a collisional-diffusive model in the case of (a) and with Hutchinson''s model[] in the case of (b). A good agreement was achieved in (a) by assuming a very low neutral gas temperature of about 400 K. In (b) the model fits the data excellently when the transport coefficient is chosen as high as D=20 m²/s. Such a high transport cannot be caused solely by diffusion. Partly it is explained by finite gyro-radii effects, but presumably time dependent phenomena, like drift waves, play an important role. In addition the dependence on the angle between surface normal and B-field was investigated. The supersonic fluxes found in the immediate vicinity of the surface are described fairly well by the model developed by Chodura[]. By contrast the size of the region, where Mach numbers greater one appear is significantly smaller than predicted.
Vitelaru, Catalin. "Caractérisation du procédé plasma de pulvérisation cathodique magnétron à ionisation additionnelle pour la synthèse de couches minces." Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112077.
Повний текст джерелаThe higher requirements on the thin films quality have supported the development of new sputtering techniques. Thus, the conventional DC magnetron discharge, one of the most widely used source of atoms for thin film deposition, has been improved by the addition of an auxiliary radio frequency discharge - new technique called RF-IPVD (Radio Frequency -Ionized Physical Vapor Deposition). This technique highly increases the ionization degree compared to conventional magnetron discharge, which is necessary for a better control of the thin films properties. An alternative method to increase the ionization is based on the use of high power pulses on the cathode, HPPMS (High Power Pulsed Magnetron Sputtering), for short periods of time ranging from ųs to tens of ųs.The present study focuses on the sputtering phenomena and the transport of metal sputtered species in these three versions of the magnetron discharge, by means of laser spectroscopy using tunable laser diodes. The recent developments of these diodes have allowed to probe the fundamental levels of titanium and aluminum, and to characterize the spatial dependency of the density and temperature as well as the velocity distribution functions of these atoms. The effect of key discharge parameters, such as current intensity and gas pressure, is studied and described for the conventional magnetron discharge. The spatial and angular velocity distribution functions were measured in front of the magnetron target, in order to characterize the metal fluxes and their behavior in the discharge volume.The study on the metal atoms in the RF-IPVD process is focused on the effect of the additional discharge on the depopulation of the ground state level. Higher ionization efficiency is found at relatively high pressure and it increases with the injected RF power. It was also showed that the thermalized atoms are the ones involved in the ionization process, while the distribution of fast atoms is almost unaffected by the additional discharge.The diagnostics of the HPPMS discharge required the development of a novel experimental procedure, able to monitor the density and temperature of neutral species with a time resolution of ųs. This procedure was used to describe the spatiotemporal evolution of metal atoms (Ti and Al) and Ar metastable atoms. These studies provide an overview on the transport of sputtered atoms during the afterglow, and a description of the pulsed discharge operation, via the creation of metastable argon atoms
Ahmad, Ahmad. "Etude de la production d'ions négatifs sur des surfaces de carbone dans un plasma d'hydrogène sans Cs à basse pression." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4702/document.
Повний текст джерелаThis thesis deals with negative ions (INs) surface production for applications in controlled fusion. Negative ions (NIs) formed at the sample surface from positive ions bombardment in hydrogen plasma are collected and analyzed with energy mass spectrometer (MS). The NI energy distribution functions (NIDF) measured by the MS are different from those emitted from surface f(E, Θ) due to modifications trajectories and energies which result when NI cross plasma and MS. In order to determine the NIDF emitted by the surface f(E,Θ) using the NIDF measured by MS f''(E), we developed a model that calculates the ion trajectories between the surface and MS detector. Then from a test function f(E,Θ) it is possible to calculate f''(E) and compare it to the experimental one. The critical issue is this method is the choice of f(E, Θ). The approach used in this thesis is the neutral backscattered and sputtered distribution function calculated by SRIM software during a surface bombardment similar to the experimental conditions. The model resulting show a good agreement between experimental and calculated NIDF, and validate our calculations and the choice of SRIM.In order to compare production mechanisms and NIs yields, a comparative study on different carbons materials was performed. Measured NIDFs show the same shape at room temperature. This indicates that the mechanisms involved in the NI production and the contribution of these mechanisms in the NIDF are the same for all materials. The best NI yield at low temperature is observed on DLC surface. The highest NI yield for all temperatures is observed on Boron doped diamond (BDD) surface at 400°C
Roettgen, Andrew M. "Vibrational Energy Distribution, Electron Density and Electron Temperature Behavior in Nanosecond Pulse Discharge Plasmas by Raman and Thomson Scattering." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1428940661.
Повний текст джерелаBlessington, Jon C. "Measurements of metastable atom density using energies and densities of energetic "fast" electrons detected in the electron energy distribution function associated with the afterglow plasma produced by a radio frequency inductively coupled plasma helium discharge." Morgantown, W. Va. : [West Virginia University Libraries], 2007. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5214.
Повний текст джерелаTitle from document title page. Document formatted into pages; contains v, 36 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 21).
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.
Повний текст джерелаGuio, Patrick. "Etude de paramètres ionosphériques à l'aide des raies de plasma électroniques observées à Eiscat." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10253.
Повний текст джерелаSosov, Yuriy. "Legendre Polynomial Expansion of the Electron Boltzmann Equation Applied to the Discharge in Argon." University of Toledo / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1145290801.
Повний текст джерелаStenberg, Gabriella. "The importance of waves in space plasmas : Examples from the auroral region and the magnetopause." Doctoral thesis, Umeå University, Physics, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-538.
Повний текст джерелаThis thesis discusses the reasons for space exploration and space science. Space plasma physics is identified as an essential building block to understand the space environment and it is argued that observation and analysis of space plasma waves is an important approach.
Space plasma waves are the main actors in many important processes. So-called broadband waves are found responsible for much of the ion heating in the auroral region. We investigate the wave properties of broadband waves and show that they can be described as a mixture of electrostatic wave modes. In small regions void of cold electrons the broadband activity is found to be ion acoustic waves and these regions are also identified as acceleration regions. The identification of the wave modes includes reconstructions of the wave distribution function. The reconstruction technique allow us to determine the wave vector spectrum, which cannot be measured directly. The method is applied to other wave events and it is compared in some detail with a similar method.
Space plasma wave are also sensitive tools for investigations of both the fine-structure and the dynamics of space plasmas. Studies of whistler mode waves observed in the boundary layer on the magnetospheric side of the magnetopause reveal that the plasma is organized in tube-like structures moving with the plasma drift velocity. The perpendicular dimension of these tubes is of the order of the electron inertial length. We present evidence that each tube is linked to a reconnection site and argue that the high density of tube-like structures indicates patchy reconnection.
Gaimard, Patricia. "Fonctions de distribution de vitesses non-maxwelliennes dans le plasma ionosphérique et application à la mesure par diffusion incohérente." Phd thesis, Université Joseph Fourier (Grenoble), 1996. http://tel.archives-ouvertes.fr/tel-00724945.
Повний текст джерелаPerret, Cécile. "Caractérisation de la population électronique dans un plasma de source d'ions à résonance cyclotronique électronique." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10123.
Повний текст джерелаAllanson, Oliver Douglas. "Theory of one-dimensional Vlasov-Maxwell equilibria : with applications to collisionless current sheets and flux tubes." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/11916.
Повний текст джерелаChergui, Mohammed. "Étude numérique de l'absorption et de l'émission d'ondes à la fréquence cyclotron électronique par un plasma de tokamak soutenu par radio-fréquence." Nancy 1, 1988. http://www.theses.fr/1988NAN10259.
Повний текст джерелаLewis, Daniel J. "Measuring ion velocity distribution functions in a compact, expanding helicon plasma." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5811.
Повний текст джерелаTitle from document title page. Document formatted into pages; contains viii, 45 p. : ill. Includes abstract. Includes bibliographical references (p. 43-45).
Tjulin, Anders. "Waves in space plasmas : Lower hybrid cavities and simple-pole distribution functions." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3527.
Повний текст джерелаYousfi, Mohammed. "Contribution a l'etude de la theorie cinetique des electrons dans un gaz faiblement ionise." Toulouse 3, 1986. http://www.theses.fr/1986TOU30229.
Повний текст джерелаAlimi, Jean-Michel. "Contributions : instabilite gravitationnelle dans un univers en expansion et formation des grandes structures, effets ponderomoteurs dans les plasmas magnetises." Paris 6, 1987. http://www.theses.fr/1987PA066234.
Повний текст джерелаWatrous, Mitchell James. "Finite temperature densities via the Green's-function method with application to electron screening in plasmas /." Thesis, Connect to this title online; UW restricted, 1997. http://hdl.handle.net/1773/9705.
Повний текст джерелаStverak, Stepan. "Study of the non-thermal character of electron distribution functions in the solar wind." Paris 6, 2009. http://www.theses.fr/2009PA066691.
Повний текст джерелаFawaz, Farah. "Simulation multidimensionnelle d'un jet de plasma froid d'hélium pour des applications biomédicales." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30204.
Повний текст джерелаThe cold plasma jets can be generated in helium-air mixtures by circulating helium in a tube that opens to the ambient air and by feeding pulsed high voltage on annular electrodes glued around the tube. Experimental studies have shown that these plasma jets are in fact composed of a succession of ionization waves guided by the helium channel. These ionization waves generate charged or unloaded active species that can be applied to animal or plant cells or serve to activate a liquid medium. The applications are multiple and concern, for example, scarring, cancer treatment, decontamination, cellular activation or help with germination and plant growth. The aim of this thesis is to build, using the COMSOL commercial software, a 2D model of the gas mixture flow coupled to ionization wave dynamics to better understand the formation of the discharge and the physicochemical characteristics of the jet that flows from it. The simulation of these devices is however very complex because of (i) the dependence of the chemical kinetics and the transport phenomena of the charged species as a function of the composition of the helium-air mixture, (ii) the mutual influence of the flow on the discharges and discharges on the flow and (iii) the dynamics of the ionization waves which requires steps of evolution time of the order of the picosecond and a spatial mesh of a few micrometres. On the basis of a 0D model of chemical kinetics in helium-air mixtures including more than 1000 reactions and a little less than 100 species, a chemical analysis and reduction work was done to extract an optimum game representative of the chemical kinetics. This model takes into account both the initial concentration variations of the species in the mixtures and the modifications of the energy distribution functions of the electrons. In a second step, a 2D model was developed to simulate the formation and propagation of ionization waves in helium-air jets using COMSOL. The ionization waves being very dynamic and lasting only a few hundred nanoseconds, we considered that the flow remained static on this time scale. The evolution of the charged species is followed using the fluid model order 1 and the necessary basic data are calculated as a function of the reduced electric field E/N and the helium-air concentration by solving the Boltzmann equation. The simulations followed the formation and the propagation of a discharge in plasma jet devices consisting of a dielectric tube and two annular electrodes. The results clearly show the formation of an initial ionization wave concentrated around the axis of the tube, which then splits to form an annular discharge that propagates along the dielectric tube to its exit. A parametric study was carried out on the wave propagation at the outlet of the tube as a function of the flow velocity of the gas in the tube
Zhu, Jianhui. "W boson measurement in the muonic decay channel at forward rapidity with ALICE." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2017. http://www.theses.fr/2017IMTA0014/document.
Повний текст джерелаThe high collision energies available at the LHC allow for an abundant production of hard probes, such as quarkonia, high-pT jets and vector bosons (W, Z), which are produced in initial hard parton scattering processes. The latter decay before the formation of the Quark-Gluon Plasma (QGP), which is a deconfined phase of QCD matter produced in high-energy heavy-ion collisions. Their leptonic decay products do not interact strongly with the QGP. Thus electroweak bosons introduce a way for benchmarking in-medium modifications to coloured probes. The production of W-boson in pp collisions at √s=8 TeV and p-Pb collisions at √sNN=5.02 TeV are measured via the muonic decay channel at the LHC with the ALICE detector. In pp collisions the rapidity covered by the measurement is -4cms<-2.5. In p-Pb collisions, on the other hand, the different energies of the proton and lead ion give rise to a rapidity shift. By exchanging the direction of the beams, it is possible to cover the rapidity ranges -4.46cms<-2.96 and 2.03cms<3.53. The production cross section and charge asymmetry of muons from W-boson decays with pμT>10 GeV/c are determined. The results are compared to theoretical calculations both with and without including the nPDFs. The W-boson production is also studied as a function of the collision centrality: the cross section of muons from W-boson decays is found to scale with the average number of binary nucleon-nucleon collisions with uncertainties
Denk, Severin Sebastian [Verfasser], Ulrich [Akademischer Betreuer] Stroth, Ulrich [Gutachter] Stroth, and Allen C. [Gutachter] Caldwell. "Study of non-thermal electron energy distribution functions by modeling of electron cyclotron emission from the fusion plasmas of the ASDEX Upgrade tokamak / Severin Sebastian Denk ; Gutachter: Ulrich Stroth, Allen C. Caldwell ; Betreuer: Ulrich Stroth." München : Universitätsbibliothek der TU München, 2019. http://d-nb.info/1181326419/34.
Повний текст джерелаChatwiti, Abdelhafid. "Etude de l'evolution temporelle des electrons dans un gaz faiblement ionise." Toulouse 3, 1988. http://www.theses.fr/1988TOU30023.
Повний текст джерелаGALIZIA, PIETRO. "Production and morphological and microstructural characterization of bulk composites or thick films for the study of multiphysics interactions." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2674672.
Повний текст джерелаSaxena, Varun. "Study of time evaluation of plasma distribution function in paul traps." Thesis, 2018. http://localhost:8080/xmlui/handle/12345678/7599.
Повний текст джерелаWen-HaoChen and 陳文晧. "Measurement of Electron Distribution Function in Space Plasma Operation Chamber." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/04544251403441517815.
Повний текст джерела國立成功大學
太空與電漿科學研究所
102
Langmuir probe is a commonly used instrument for measuring the electron density and temperature in the ionosphere. The measurement of electron distribution function (EDF) is also an important application of the Langmuir probe measurement. The typical EDF dynamic range of the Langmuir probe measurement is about 2~3 orders of magnitude, which is too small to measure EDF in wide energy range due to the small signal-to-noise (S/N) ratio. In addition, the Langmuir probe measurement on small satellites suffers the effect of finite satellite/probe surface area ratio, which causes inaccurate measurement results. Hence, the goal of this thesis is to develop a new system to measure EDF with large dynamic range and large S/N ratio, and the new device can theoretically avoid the effects of finite satellite/probe surface area ratio on the EDF measurement on small satellites. We will describe the Langmuir probe system design and electronic circuits, the development of a new device for measuring EDF using the channel electron multiplier, and experimental results obtained in Space Plasma Operation Chamber of the Plasma and Space Science Center at National Cheng Kung University. We also investigate the effect of finite satellite/probe surface area ratio on the Langmuir probe measurement, which needs to be considered when the Langmuir probe is deployed onboard small satellites.
Dodt, Dirk Hilar [Verfasser]. "Determination of the electron energy distribution function of a low temperature plasma from optical emission spectroscopy / vorgelegt von Dirk Hilar Dodt." 2009. http://d-nb.info/995870381/34.
Повний текст джерела