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Dissertations / Theses on the topic 'Electron beam plasma'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Löfgren, Torbjörn. "Numerical modeling of electron beam-plasma interactions." Doctoral thesis, KTH, Alfvén Laboratory, 1999. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-2878.

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2

Knetsch, Alexander [Verfasser], and Bernhard [Akademischer Betreuer] Hidding. "Acceleration of laser-injected electron beams inan electron-beam driven plasma wakefieldaccelerator / Alexander Knetsch ; Betreuer: Bernhard Hidding." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2018. http://d-nb.info/115388433X/34.

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3

Oleksiienko, G. A. "Influence of helical electron beams on dynamics of waves in plasma-beam SFEL of dopplertron type." Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/40619.

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To investigate the device which is capable of generate and amplify a coherent electromagnetic radiation in the millimeter and submillimeter wavelength ranges is extremely important today. In the research under discussion the model of a plasma-beam superheterodyne free electron laser (SFEL) is the following. Plasma is located in the longitudinal focusing magnetic field with strength H0. Relativistic electron beam is injected into this plasma environment at an angle α with respect to the magnetic field strength vector. We chose a circularly polarized intense low-frequency electromagnetic

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4

Yamazaki, Atsushi. "Quasi-monoenergetic electron beam generation by intense short pulse laser plasma interaction." 京都大学 (Kyoto University), 2006. http://hdl.handle.net/2433/136710.

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5

Ikram, M. "Radio-frequency generation of an electron plasma in a Malmberg-Penning trap and its interaction with a stationary or pulsed electron beam." Doctoral thesis, Università degli Studi di Milano, 2014. http://hdl.handle.net/2434/233616.

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Experiments and numerical investigations on trapped electron plasmas and traveling electron bunches are discussed. A Thomson backscattering diagnostics set up was installed in the ELTRAP (Electron TRAP) device, a Penning-Malmberg trap operating at the Department of Physics of the University of Milano since 2001. Here, an infrared (IR) laser pulse collides with nanosecond electron bunches with an energy of 1-20 keV traveling through a longitudinal magnetic field in a dynamical regime where space-charge effects play a significant role. The backscattered radiation is optically filtered and detec

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6

Bobadilla, Alfredo D., Leonidas E. Ocola, Anirudha V. Sumant, Michael Kaminski, and Jorge M. Seminario. "PMMA-Assisted Plasma Patterning of Graphene." Hindawi Limited, 2018. http://hdl.handle.net/10757/624681.

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Microelectronic fabrication of Si typically involves high-temperature or high-energy processes. For instance, wafer fabrication, transistor fabrication, and silicidation are all above 500°C. Contrary to that tradition, we believe low-energy processes constitute a better alternative to enable the industrial application of single-molecule devices based on 2D materials. The present work addresses the postsynthesis processing of graphene at unconventional low temperature, low energy, and low pressure in the poly methyl-methacrylate- (PMMA-) assisted transfer of graphene to oxide wafer, in the elec

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7

Del, Pozo Rodriguez Sofia. "Investigation and optimisation of a plasma cathode electron beam gun for material processing applications." Thesis, Brunel University, 2016. http://bura.brunel.ac.uk/handle/2438/13565.

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This thesis describes design, development and testing work on a plasma cathode electron beam gun as well as plasma diagnosis experiments and Electron Beam (EB) current measurements carried out with the aim of maximising the power of the EB extracted and optimising the electron beam gun system for material processing applications. The elements which influence EB gun design are described and put into practice in a thermionic EB gun case study. The relevant principles of plasma EB gun systems, such low-temperature, low-pressure, RF excitation, are described along with the test rigs developed to i

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8

YADAV, MONIKA. "SOME ASPECTS OF LASER-PLASMA INTERACTION FOR ELECTRON ACCELERATION." Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18736.

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This thesis focuses on investigation of laser-plasma interaction relevant to electron acceleration to high energies. This work explores various ideas for producing an energetic and good quality electron beam from laser wakefield acceleration (LWFA) in plasmas. In LWFA, a high-intensity laser pulse excites a plasma wave, which propagates behind the laser pulse with the equal speed of the laser group velocity. For efficient accelerations, electrons should be injected into the wakefield. Thus, the wakefield evolution and electron injection both are quite important aspects in LWFA. In order

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9

Ali, Safdar. "Electron - Ion Recombination Data for Plasma Applications : Results from Electron Beam Ion Trap and Ion Storage Ring." Doctoral thesis, Stockholms universitet, Fysikum, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-75311.

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This thesis contains results of electron-ion recombination processes in atomic ions relevant for plasma applications. The measurements were performed at the Stockholm Refrigerated Electron Beam Ion Trap (R-EBIT) and at the CRYRING heavy-ion storage ring. Dielectronic recombination (DR) cross sections, resonant strengths, rate coefficients and energy peak positions in H-like and He-like S are obtained for the first time from the EBIT measurements. Furthermore, the experimentally obtained DR resonant strengths are used to check the behaviour of a scaling formula for low Z, H-and He-like iso-elec

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10

Vitale, Steven A. (Steven Arthur). "Decomposition of chlorinated ethylenes and ethanes in an electron beam generated plasma reactor." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10815.

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11

Murphy, Suzanne Marie. "Electron beam-plasma interactions with the Versatile Toroidal Facility (VTF) for ionospheric simulation." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/41345.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.<br>Includes bibliographical references (leaves 50-51).<br>by Suzanne Marie Murphy.<br>M.Eng.

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12

Debayle, Arnaud. "Theoretical study of Ultra High Intensity laser-produced high-current relativistic electron beam transport through solid targets." Thesis, Bordeaux 1, 2008. http://www.theses.fr/2008BOR13708/document.

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Cette thèse porte sur l’étude théorique du transport d’un faisceau intense d’électrons relativistes dans une cible solide. Dans la première partie nous présentons les interprétations théoriques d’une partie des résultats d’une campagne d’expérience portant sur la production et le transport d’électrons relativistes dans une cible d’aluminium. Nous y démontrons la prédominance des e?ets collectifs sur les e?ets collisionels dans la première dizaine de microns de propagation grâce à des modèles de transports déjà existant au début de cette thèse. Ces modèles deviennent insu?sants dans le cas du t

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13

Brieda, Lubos. "Development of the DRACO ES-PIC code and Fully-Kinetic Simulation of Ion Beam Neutralization." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/33755.

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This thesis describes development of the DRACO plasma simulation code. DRACO is an electro-static (ES) code which uses the particle-in-cell (PIC) formulation to track plasma particles through a computational domain, and operates within the Air Force COLISEUM framework. The particles are tracked on a non-standard mesh, which combines the benefits of a Cartesian mesh with the surface-resolving power of an unstructured mesh. DRACO contains its own mesher, called VOLCAR, which is also described in this work. DRACO was applied to a fully kinetic simulation of an ion-beam neutralization. The t

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14

Nariyuki, Y., and T. Umeda. "On the nonlinearity of the Langmuir turbulence excited by a weak electron beam-plasma interaction." American Institute of Physics, 2010. http://hdl.handle.net/2237/14152.

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15

Lishilin, Osip [Verfasser], and Florian [Akademischer Betreuer] Grüner. "Study of self-modulation of an electron beam in plasma / Osip Lishilin ; Betreuer: Florian Grüner." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2019. http://d-nb.info/1186891203/34.

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16

Chen, Xiaoming. "Laser-cluster interaction and its applications in semiconductor processing /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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17

Alontseva, D. L., A. L. Krasavin, T. A. Kolesnikova, et al. "Computer Simulation of Temperature Profiles for E-beam Modification of Ni- Based Plasma Detonation Coatings." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35414.

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The paper presents the calculation of the distribution of the temperature profile in two-layer metallic materials under direct current low-energy electron beam irradiation and proposes explicit parameters of the electron beam for modification of thick (150-300 microns) plasma detonation Ni-based coatings by irradiation. Ni-based coatings deposited onto steel substrates were interpreted as a Ni-Fe two-layer sample irradiated on the coating side. The numerical simulation methods were used for solving the heat equation. The model takes into account the electron beam travelling, dependence of

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18

Perng, John Kangchun. "High Aspect-Ratio Nanoscale Etching in Silicon using Electron Beam Lithography and Deep Reactive Ion Etching (DRIE) Technique." Thesis, Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11543.

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This thesis reports the characterization and development of nanolithography using Electron Beam Lithography system and nanoscale plasma etching. The standard Bosch process and a modified three-pulse Bosch process were developed in STS ICP and Plasma ICP system separately. The limit of the Bosch process at the nanoscale regime was investigated and documented. Furthermore, the effect of different control parameters on the process were studied and summarized in this report. 28nm-wide trench with aspect-ratio of 25 (smallest trench), and 50nm-wide trench with aspect ratio of 37 (highest aspect-rat

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19

Imadera, Kenji. "Kinetic Analysis based on Lie Perturbation Theory for Relativistic Electron Beam and Global Turbulent Plasma Transport." Kyoto University, 2010. http://hdl.handle.net/2433/123350.

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20

Ceccolini, Elisa <1983&gt. "Development and performance assessment of a Plasma Focus electron beam generator for Intra-Operative Radiation Therapy." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4736/1/Ceccolini_Elisa_tesi.pdf.

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The Plasma Focus is a device designed to generate a plasma sheet between two coaxial electrodes by means of a high voltage difference. The plasma is then driven to collapse into a “pinch”, where thermonuclear conditions prevail. During the “pinch phase” charged particles are emitted, with two main components: an ion beam peaked forward and an electron beam directed backward. The electron beam emitted backward by Plasma Focus devices is being investigated as a radiation source for medical applications, using it to produce x-rays by interaction with appropriate targets (through bremsstrahlung an

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21

Ceccolini, Elisa <1983&gt. "Development and performance assessment of a Plasma Focus electron beam generator for Intra-Operative Radiation Therapy." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amsdottorato.unibo.it/4736/.

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The Plasma Focus is a device designed to generate a plasma sheet between two coaxial electrodes by means of a high voltage difference. The plasma is then driven to collapse into a “pinch”, where thermonuclear conditions prevail. During the “pinch phase” charged particles are emitted, with two main components: an ion beam peaked forward and an electron beam directed backward. The electron beam emitted backward by Plasma Focus devices is being investigated as a radiation source for medical applications, using it to produce x-rays by interaction with appropriate targets (through bremsstrahlung an

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22

Sampath, Archana [Verfasser], and Christoph H. [Akademischer Betreuer] Keitel. "Strong-field QED and collisional effects in electron beam-plasma interaction / Archana Sampath ; Betreuer: Christoph H. Keitel." Heidelberg : Universitätsbibliothek Heidelberg, 2020. http://d-nb.info/122376737X/34.

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23

Bazaleev, M. I., S. E. Donets, V. V. Lytvynenko, et al. "Optimization of Technology for Production of Bimetallic Compounds by High-current Relativistic Electron Beam Hardfacing of Nanostructured Coatings." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35128.

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The mechanism of remote application of nanostructured coatings on metallic substrates is considered in the article. Spectroscopic studies of gas-plasma torch produced when the number of materials used in coatings is irradiated by the high-current relativistic electron beam have been carried out. The differences in the spectra for solid and tubular beams are determined. Measurements of the brightness temperature of gas plasma torch and the position of its maximum are obtained. Prospects of using high-current relativistic electron beams sources with pulse duration ~ (1 ... 2)10 – 6 s for t

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24

Hemberg, Oscar. "Compact Liquid-Jet X-Ray Sources." Doctoral thesis, KTH, Physics, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3716.

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<p>This thesis describes the development, characterization andoptimization of compact, high-brightness, liquid-jet-targetx-ray sources. Two different source types have been developedfor different wavelength regions and applications.</p><p>A laser-plasma source for generating soft x-ray andextreme-ultraviolet radiation has been further developed forsoft x-ray microscopy and extreme-ultraviolet lithography. Thiswork focused on improved target stability, increased conversionefficiency and decreased debris production. For x-raymicroscopy applications using carbon-containingliquid-jetdroplet target

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25

Gavrilov, N. V., and A. I. Menshakov. "Effect of ion flux parameters on the rate of austenitic stainless steel nitriding in electron beam generated plasma." Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20843.

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Nitriding of metals in electron beam generated plasma provides change of ion current density j and ion energy E over a wide range, the constant temperature of a sample being sustained by change of electron beam parameters. Broad (100 cm2) electron beam (5-20 A, 60-500 eV) was generated by electron source with a plasma cathode. 12X18 10 stainless steel was nitrided at 500 during 1 h. Dependences of nitriding layer thickness on j (1,6-6,2 m/cm2), E (100-300 eV), pressure of Ar-N2 gas mixture (1-10 Pa) were obtained. Nitrided layer thickness was measured in cross-sections with the use of micro

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26

Touati, Michaël. "Fast Electron Transport Study for Inertial Confinement Fusion." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0076/document.

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Un nouveau mod`ele r´eduit pour le transport de faisceaux d’´electrons relativistes dans des solide ou des plasma denses est propos´e. Il est bas´e sur la r´esolution des deux premiers moments angulaires de l’´equation cin´etique relativiste, compl´et´es par une relation de fermeture d´eduite du principe de maximisation de l’entropie angulaire de Minerbo. Le mod`ele prend en compte aussi bien les effets collectifs du transport avec les champs ´electromagn´etiques auto g´en´er´es que les effets collisionnels li´es au ralentissement des ´electrons par collision sur les plasmons, les ´electrons l

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27

Schlise, Charles A. "Explosive emission cathodes for high power microwave devices /." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FSchlise.pdf.

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28

Zhang, Bochun. "Failure Mechanism Analysis and Life Prediction Based on Atmospheric Plasma-Sprayed and Electron Beam-Physical Vapor Deposition Thermal Barrier Coatings." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/35709.

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Using experimentally measured temperature-process-dependent model parameters, the failure analysis and life prediction were conducted for Atmospheric Plasma Sprayed Thermal Barrier Coatings (APS-TBCs) and electron beam physical vapor deposition thermal barrier coatings (EB-PVD TBCs) with Pt-modified -NiAl bond coats deposited on Ni-base single crystal superalloys. For APS-TBC system, a residual stress model for the top coat of APS-TBC was proposed and then applied to life prediction. The capability of the life model was demonstrated using temperature-dependent model parameters. Using existing

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29

Schuetze, Matthew P. (Matthew Paul). "Controlling a field test electron beam-generated plasma system for the decomposition of chlorinated volatile organic compounds in air streams." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/28109.

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30

Wang, Ke. "Design study of a Laser Plasma Wakefield Accelerator with an externally injected 10-MeV electron beam coming from a photoinjector." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS179/document.

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Nous étudions l’accélération d’un faisceau d’électrons provenant d’un photoinjecteur RF lorsque celui-ci est injecté dans le champ électrique à très fort gradient crée par un laser de forte puissance dans un plasma. Dans cette thèse la configuration d’une telle expérience est étudiée et des simulations du début à la fin sont présentées. Étant donné qu’un faisceau ultra-court d’électrons (quelques femto secondes) est nécessaire pour atteindre une faible dispersion en énergie dans le plasma, le faisceau d’électrons de 10 MeV provenant du photoinjecteur est comprimé en deux étapes. Le premier éta

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31

Kulish, Viktor Vasylovych, Виктор Васильевич Кулиш, Віктор Васильович Куліш та ін. "Механизмы насыщения супергетеродинных плазма-пучковых лазеров на свободных электронах с допплертронной накачкой". Thesis, Изд-во СумДУ, 2009. http://essuir.sumdu.edu.ua/handle/123456789/4121.

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32

Burnham, Shawn David. "Improved understanding and control of Mg-doped GaN by plasma assisted molecular beam epitaxy." Diss., Available online, Georgia Institute of Technology, 2007, 2007. http://etd.gatech.edu/theses/available/etd-06122007-133821/.

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Thesis (Ph. D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008.<br>Doolittle, W. Alan, Committee Chair ; Ferguson, Ian T., Committee Member ; Cressler, John D., Committee Member ; Dorsey, John F., Committee Member ; Carter, W. Brent, Committee Member.

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33

Guyot, Coline. "Optimisation of electron beam performance for high peak current laser-plasma and multi-pass energy recovery accelerators with 6D tracking start-to-end simulations." Electronic Thesis or Diss., université Paris-Saclay, 2025. http://www.theses.fr/2025UPASP007.

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Dans la quête d'accélérateurs d'électrons plus compacts et moins consommateurs d'énergie, le courant crête tend à être augmenté pour différentes raisons. Dans le contexte de la thèse deux approches alternatives aux accélérateurs plus conventionnels sont explorées: laser-plasma et linacs à récupération d'énergie (ERL). Pour les accélérateurs à laser-plasma, le courant crête est dû à la durée extrêmement courte des paquets, tandis que pour le cas de l'ERL, le courant de crête est dû à la charge par paquet.Les faisceaux laser-plasma sont des faisceaux d'électrons atypiques en raison de leurs gran

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34

Kulish, Viktor Vasylovych, Виктор Васильевич Кулиш, Віктор Васильович Куліш та ін. "Квадратично-нелинейная теория параметрического резонанса пучковых волн в двухскоростном электронном пучке". Thesis, Изд-во СумДУ, 2009. http://essuir.sumdu.edu.ua/handle/123456789/4123.

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35

Wittig, Georg [Verfasser], and Brian [Akademischer Betreuer] Foster. "Start-to-end simulations of hybrid laser-and beam-driven plasma wakefield acceleration and free electron lasers / Georg Wittig ; Betreuer: Brian Foster." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2017. http://d-nb.info/1150183586/34.

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36

Hartl, Hugo M. "Modification of small-molecule organic thin films using energetic beams and plasma." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/129526/9/Hugo%20Hartl%20Thesis.pdf.

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This project investigated directed energy techniques for modifying organic films. These techniques show great promise for creating materials with unique, tailored properties. In this work, ion and electron beams were used to fabricate spatially-defined polymer features in nanometre-scale film of small molecules. An alternative pathway to the direct on-surface fabrication of polymer surface coatings was also investigated and showed that a room temperature, atmospheric pressure plasma can facilitate coupling of small molecules at a catalytic surface. In all cases, it was possible to control the

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37

Wendt, Martin. "Experimental Investigations of Wave Motion and Electric Resistance in Collisionfree Plasmas." Doctoral thesis, Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3199.

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38

Bouchet, Alexandre. "Expérimentation numérique de la pénétration d'un faisceau intense d'électrons relativistes dans un gaz dense neutre." Grenoble 1, 1988. http://www.theses.fr/1988GRE10156.

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Dans le nez du faisceau, les effets thermiques sont domines parles effets electromagnetiques. Il est donc legitime d'utiliser, en premiere approximation du moins, une approximation froide. On a developpe un code hydrodynamique a faisceau laminaire ou froid; le plasma secondaire est decrit de facon detaillee. On a mis en evidence, outre les proprietes du plasma secondaire et de la carte des champs, la neutralisation progressive en charge du faisceau avec ejection des electrons secondaires, les courants de retour ou d'accompagnement, le point de pincement, et sa vitesse de recession

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Poczklán, Ladislav. "Modifikace kvazikrystalických kompaktů SPS pomocí technologie elektronového paprsku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-377885.

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The quasicrystals are characterized by unusual rotational symmetries that are not observed in the crystalline materials, which is the cause of their interesting material properties. Because of that a particular attention was paid to quasicrystalline structures in the literature research. The research also contains a description of electron beam technology, spark plasma sintering method and introduction to the problematics of wear. As the default materials for the experimental part were selected Titanium Grade 2 powder and Cristome A5 powder which was partially composed of quasicrystalline phas

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Kim, Danny. "Dry passivation studies of GaAs(110) surfaces by Gallium Oxide thin films deposited by electron cyclotron resonance plasma reactive molecular beam epitaxy for optoelectronic device applications." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ63140.pdf.

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Тихонова, А. С. "Двухпотоковая неустойчивость". Thesis, Сумский государственный университет, 2015. http://essuir.sumdu.edu.ua/handle/123456789/43439.

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При исследовании состояния плазмы, в котором она не является полностью термодинамически-равновесной, свободная энергия, имеющаяся в системе, может привести к самовозбуждению волн, при этом в плазме наблюдается неустойчивость. Одним из типов неустойчивости является двухпотоковая, которая может возникать как при встречном, так и при сонаправленном движении пучков зарядженных частиц с близкими по модулю скоростями.

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42

Szalek, Nicolas. "Etudes expérimentales et numériques de l'interaction d'un faisceau d'électrons avec une cible aluminium." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0080.

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Une des applications des faisceaux intenses d’électrons relativistes est la caractérisation de matériaux soumis à leur irradiation. L’étude des chocs en résultant permet de développer et de valider les équations d’états de ces matériaux. Au CEA/CESTA nousdisposons de deux générateurs qui seront décrits et utilisés dans cette thèse. CESAR est un générateur produisant un faisceau d’électrons de 800 keV, 300 kA, sur une durée de 60 ns. En raison du fort courant, le faisceau est transporté dans 1 mbar d’air puis il est focalisé grâce à un champ magnétique externe. Le temps de fonctionnement de CES

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43

Feinäugle, Peter. "Experimentelle und numerische Untersuchungen zu entladungsbasierten Elektronenstrahlquellen hoher Leistung." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-88973.

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Entladungsbasierte Elektronenquellen mit Kaltkathode waren gegen Ende des 19. Jahr hunderts weithin genutzte Forschungswerkzeuge und ermöglichten die Entdeckung des Elektrons und der Röntgenstrahlung. In jüngster Zeit erfahren sie erneutes Interesse in Wissenschaft und Industrie, motiviert durch ihre Fähigkeit, Elektronenstrahlen hoher Leistung für Produktionsprozesse (wie das Schweißen, die Materialverdampfung in der Vakuum beschichtung oder die Vakuum-Schmelzveredlung in der Metallurgie) basierend auf einem robusten Design sowie einfachen Versorgungs- und Steuerungssystemen zu erzeugen. Entl

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Zamchiy, A. O., S. Ya Khmel, and E. A. Baranov. "Influence of Substrate Temperature on the Optical Properties and the Deposition Rate of Amorphous Silicon Films." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35394.

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Layers of intrinsic hydrogenated amorphous silicon (a-Si:H) films were deposited using Gas-Jet Electron Beam Plasma Chemical Vapor Deposition (GJ-EBP-CVD) technique. The optical parameters (refraction index (n), absorption coefficient ( )) and the thickness were determined from the extremes of the interference fringes of transmission spectrum in the range of 500 – 1000 nm using the envelope method and method PUMA. The spectral dependence of the refractive index and absorption coefficient was obtained by varying the substrate temperature (Ts). The optical band gap (Eg) was determined using

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Олексієнко, Галина Андріївна, Галина Андреевна Алексеенко та Halyna Andriiivna Oleksiienko. "Мультигармонические взаимодействия в плазменно-пучковых супергетеродинных лазерах на свободных электронах с винтовыми электронными пучками". Thesis, Сумской государственный университет, 2016. http://essuir.sumdu.edu.ua/handle/123456789/48782.

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Дисертаційна робота присвячена теоретичному дослідженню динаміки хвиль та аналізу режимів роботи плазмово-пучкових супергетеродинних лазерів на вільних електронах з гвинтовими релятивістськими електронними пучками з урахуванням мультигармонічних взаємодій. Побудовані мультигармонічні кубічно-нелінійні теорії плазмово-пучкових супергетеродинних ЛВЕ з гвинтовими РЕП доплертронного та Н-убітроного типів. З’ясовано, що темпи зростання хвиль у плазмово-пучкових СЛВЕ підвищуються при збільшені кута вльоту електронного пучка. Отримано, що множинні параметричні взаємодії гармонік хвиль призводять до з

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RAOULT, BARBEZAT ANTOINETTE. "Emissions radioelectriques et x-dur au cours de la phase impulsive des eruptions solaires." Paris 7, 1987. http://www.theses.fr/1987PA077150.

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Modelisation simple de la propagation des faisceaux d'electrons dans la couronne solaire a partir d'observations solaires radio et x-dur. Les resultats obtenus montrent que les electrons emettent preferentiellement en structures fines surdenses dans la moyenne couronne, que la vitesse des electrons excitateurs de sursauts de type iii a jusqu'a present ete sous-estimee, que le mecanisme d'acceleration produit une composante energetique caracteristique de la phase impulsive et d'autre part une composante a evolution lente qui domine pendant la phase de decroissance, et que les distributions inje

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Mareš, Jiří. "Modifikace charakteru rozhraní substrát-nástřik vrstev deponovaných technologiemi žárového nanášení pomocí technologie elektronového paprsku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231939.

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Tato práce je zaměřena na modifikaci charakteru rozhraní substrát-nástřik NiCrAlY povlaků nanesených pomocí technologie vodou stabilizované plazmy na substráty z oceli S235JRC+C. Přetavení žárové vrstvy elektronovým paprskem bylo zvoleno jako technologie pro modifikaci a dvě různé modifikace byly zkoumány. V práci byl proveden pokus o stanovení vlivu modifikací na adhezní vlastnosti nástřiku. Dále jsou v práci prezentovány analýzy mikrostruktury, fázového a chemického složení a mikrotvrdosti ve stavu před a po modifikaci. Během studie bylo zjištěno, že dochází ke změnám fázového složení jak bě

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Biodedet, Lambert. "Intéraction d'une onde produite par un laser à électrons libres avec le plasma du tokamak alcator C : Étude numérique par la méthode des éléments finis." Nancy 1, 1988. http://www.theses.fr/1988NAN10021.

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Étude de l'intéraction d'une onde laser à électrons libres, polarisée sur le mode ordinaire, avec le plasma du tokamak alcator C. On considère le modèle "slab" pour la description spatiale du plasma toroïdal. Les résultats obtenus par un code à éléments finis confirment que la fonction de distribution des vitesses des particules se déforme au cours du temps et en chaque point de l'espace sous l'effet de l'onde. On note l'apparition d'effets quasi linéaires, qui réduisent localement l'absorption de l'énergie de l'onde. L'effet prédominant de l'absorption résonnante est l'augmentation de la temp

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Rudyk, Martin. "Porovnání navařování svazkem elektronů a plazmou." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231419.

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This diploma thesis deals with plasma cladding and electron beam cladding. The theoretical part is divided into several chapters which is focused on description of these methods of cladding process. In the practical part the particular experiment of electron beam cladding (EBC) and plasma cladding (PC) is described. In the conclusion overall results were assessed, both methods were compared each other and possible exploitation in industry was described.

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Tran, Duc-Duy. "Techniques avancées de gravure pour les composants électroniques et optiques en diamant." Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALT115.

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Le diamant suscite depuis quelques années une attention considérable en tant que matériau de choix pour les dispositifs électroniques et optiques avancés. Cependant, pour exploiter pleinement son potentiel, il est essentiel de surmonter des défis majeurs dans les processus de gravure. En effet, si les liaisons carbone-carbone très fortes du diamant lui confèrent des propriétés très intéressantes, elles rendent les procédés de gravure inefficaces ou mal adaptés. Les méthodes de gravure classiques sont inadaptées car elles causent trop de dommages de surface et de subsurface, ce qui affecte les

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