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Dissertations / Theses on the topic 'High-power sources'

Author: Grafiati

Published: 17 May 2025

Last updated: 19 July 2025

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1

LEGGIERI, ALBERTO. "High power sources and innovations for high frequency electronics." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2014. http://hdl.handle.net/2108/202459.

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This study would propose the development of innovative devices, in vacuum electronics field for high energy and high frequency applications. Design strategies for the improvement of electron devices are proposed in order to reduce size and increase efficiency of these devices, in particular referring to high power sources. As for high power sources, vacuum tube oscillators capable to generate simple sinusoidal signals or more complex signals are intended. In order to increase efficiency and frequency range of vacuum tubes, a new design approach for the development electron sources is proposed.

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2

Möller, Cecilia. "High Power Microwave Sources : design and experiments." Licentiate thesis, KTH, Rymd- och plasmafysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-34072.

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High-Power Microwaves (HPM) can be used to intentionally disturb or destroy electronic equipment at a distance by inducing high voltages and currents. This thesis presents results from experiments with a narrow band HPM source, the vircator. The high voltages needed to generate HPM puts the vircator under great stress, especially the electrode materials. Several electrode materials have been tested for endurance and their influence on the characteristics of the microwave pulse. With the proper materials the shot-to-shot variations are small and the geometry can be optimized in terms of e.g. ou

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3

Kheder, Abdul-Sameei Yaseen. "Starting high inertia, high friction loads from limited power sources." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184455.

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At starting, electrical motors require large power and current. This may not be a problem in a large electrical system but it may be very severe for a limited power source like a solar array. If a direct approach is taken the array rating must be 5-6 times the motor rating in order to start the motor and its high inertia high friction load. Batteries have been used to store energy and supply that energy for starting. Batteries need maintenance and their low efficiency is a problem too. In this study a new type of controller has been suggested and developed for the use with D.C. motors. Compute

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4

Soh, Daniel Beom Soo. "Advanced waveguides for high power optical fibre sources." Thesis, University of Southampton, 2005. https://eprints.soton.ac.uk/30236/.

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This thesis reports on theoretical and experimental studies of wavelength-selective waveguide structures for high-power Nd3+- and Yb3+-doped fibre lasers. Cladding-pumped high-power fibre lasers based on these novel waveguide designs and operating at desired unconventional wavelengths were investigated through numerical simulations and fibre laser experiments. Rare earth doped fibres have typically multiple emission bands of different effective strengths. Stimulate emission from strong bands dominates over, and via a reduced population inversion normally even suppresses, emission from weaker b

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5

Hirst, Peter Frank. "Low pressure plasmas for high power microwave sources." Thesis, University of St Andrews, 1992. http://hdl.handle.net/10023/13613.

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This thesis describes an investigation of the use of low pressure plasmas for the generation of high power microwaves. Previous research has shown that the efficiency of a high power microwave ("HPM") source such as a BWO is enhanced by the introduction of a low pressure plasma into the oscillator cavity. The principle aim of this thesis is to extend the use of low pressure plasmas to the whole HPM system. Electron beams with current densities of the order of 20 A cm-2 can be generated in a cold cathode glow discharge at low gas pressures. Results are presented which show the effects of magnet

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6

Möller, Cecilia. "Design and Experiments with High Power Microwave Sources : The Virtual Cathode Oscillator." Doctoral thesis, KTH, Rymd- och plasmafysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104794.

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High-Power Microwaves (HPM) can be used to intentionally disturb or destroy electronic equipment at a distance by inducing high voltages and currents.This thesis presents results from simulations and experiments with a narrow band HPM source, the vircator. The high voltages needed to generate HPM puts the vircator under great stress, especially the electrode materials. Several electrode materials have been tested for endurance and their influence on the characteristics of the microwave pulse. With the proper materials the shot-to-shot variations are small and the geometry can be optimized in t

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7

Sánchez, Bautista Enrique. "High-power, fiber-laser-pumped frequency conversion sources for the ultraviolet." Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/327591.

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High-power, stable, high-repetition-rate, picosecond ultraviolet (UV) sources are of crucial importance for a variety of applications, such as atmospheric sensing, spectroscopy or optical data storage. Further, precise material processing or laser patterning requires high energy sources with ultrashort pulses for increased accuracy. Nonlinear, single-pass, frequency conversion sources present a highly effective and simplified approach to cover the UV spectral regions inaccessible to lasers, offering potential solutions for many of the applications mentioned above. The development of high-aver

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8

Codemard, Christophe André. "High-power cladding-pumped Raman and erbium-ytterbium doped fibre sources." Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/47776/.

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Raman fibres and rare-earth doped silica fibres have been investigated for many years as gain media for the amplification of optical signals in telecommunications thanks to their broad gain bandwidth. They are now widely used for that application. It is only recently that power scaling of fibre laser sources has taken place with the development of double-clad fibres and highpower laser diode pump sources. Cladding-pumped fibre lasers are now a rapidly expanding and emerging technology with a wide range of applications, where high-power and high-brightness laser sources are required. Neverthele

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9

Aydin, Yiğit Ozan. "Development of high-power 3 μm fiber laser sources and components". Doctoral thesis, Université Laval, 2019. http://hdl.handle.net/20.500.11794/37620.

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Les systèmes laser en fibre optique de verre fluoré se sont placés en tête de file pour la génération de lumière cohérente dans l’infrarouge moyen, de 2 à 5 μm. En particulier, les lasers à fibre opérant à 3 μm ont attiré une attention considérable puisqu’ils permettent le développement d’applications en spectroscopie, en contre-mesure militaire et en médecine. De ce fait, ces lasers ont connu des progrès considérables en termes de puissance, de qualité de faisceau, de fiabilité et de compacité dans la dernière décennie. Cette thèse s’inscrit dans cette démarche d’accroissement des performance

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10

Meier, Ingolf. "Microwave dielectric heating through interference modulation with narrow band high power sources." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52936.

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Thesis (PhD)--Stellenbosch University, 2002.<br>ENGLISH ABSTRACT: One of the most difficult problems in microwave dielectric heating is the generation and control of field and heating patterns. A technique allowing the synthesis of different, pre-determinable heating patterns by interference modulation is proposed. The proposed concept may be described by the term 'interference modulation'. Interference modulation is a technique which enables particular patterns, called features, to be obtained by signals from several sources interfering with each other. The relative phases of the signal

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11

Mwaniki, Fredrick Mukundi. "High voltage boost DC-Dc converter suitable for variable voltage sources and high power photovoltaic application." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/37320.

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Important considerations of a photovoltaic (PV) source are achieving a high voltage and drawing currents with very little ripple component from it. Furthermore, the output from such a source is variable depending on irradiation and temperature. In this research, literature review of prior methods employed to boost the output voltage of a PV source is examined and their limitations identified. This research then proposes a multi-phase tapped-coupled inductor boost DC-DC converter that can achieve high voltage boost ratios, without adversely compromising performance, to be used as an interface t

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12

Kienle, Florian. "Advanced high-power optical parametric oscillators synchronously pumped by ultrafast fibre-based sources." Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/210235/.

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This thesis is concerned with investigating the generation of ultra short, tunable pulses at high average power and / or high pulse energy using synchronously pumped optical parametric oscillators (OPO) and appropriate power-scalable fibre-amplifier pump sources. Two types of pump sources with average powers up to ≈ 100W are considered: (1) a picosecond, allfiberised, high-power, variable-repetition-rate, Yb:fibre-amplified, gain-switched laser diode system and (2) a femtosecond, high-power, chirped-pulse amplification Yb:fibre laser system incorporating a pulse shaper module. Such OPO systems

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13

Amir, Faisal. "Advanced physical modelling of step graded Gunn Diode for high power TeraHertz sources." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/advanced-physical-modelling-of-step-graded-gunn-diode-for-high-power-terahertz-sources(d0fea62f-ed98-4fa7-8a97-cb89776c08cd).html.

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The mm-wave frequency range is being increasingly researched to close the gap between 100 to 1000 GHz, the least explored region of the electromagnetic spectrum, often termed as the 'THz Gap'. The ever increasing demand for compact, portable and reliable THz (Terahertz) devices and the huge market potential for THz system have led to an enormous amount of research and development in the area for a number of years. The Gunn Diode is expected to play a significant role in the development of low cost solid state oscillators which will form an essential part of these THz systems.Gunn and mixer dio

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14

Agostinetti, Piero. "Methods for the Thermo-mechanical Analysis and Design of High Power Ion Sources." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3425025.

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The present doctorate thesis regards the major issues related to the thermo-mechanical analysis and design of high power ion sources. The activities were carried out in the following three areas: 1. Experimental activities on the existing ion sources. 2. Evaluation of the main operating parameters (plasma density, heat loads etc.) of the ITER Neutral Beam Injector (NBI) ion source. 3. Optimization of the thermo-mechanical design of the ITER NBI ion source, considering both the point of views of a good operating behaviour (in terms of ion current density and electrons-to-ions ratio) and a go

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15

Pötzlberger, Markus [Verfasser], and Ferenc [Akademischer Betreuer] Krausz. "High-power femtosecond laser sources for mid-infrared generation / Markus Pötzlberger ; Betreuer: Ferenc Krausz." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2021. http://d-nb.info/1237221625/34.

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16

Leigh, Matthew. "HIGH POWER PULSED FIBER LASER SOURCES AND THEIR USE IN TERAHERTZ GENERATION&#8194." Diss., The University of Arizona, 2008. http://hdl.handle.net/10150/193797.

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In this dissertation I report the development of high power pulsed fiber laser systems. These systems utilize phosphate glass fiber for active elements, instead of the industry-standard silica fiber. Because the phosphate glass allows for much higher doping of rare-earth ions than silica fibers, much shorter phosphate fibers can be used to achieve the same gain as longer silica fibers.This single-frequency laser technology was used to develop an all-fiber actively Q-switched fiber lasers. A short cavity is used to create large spacing between longitudinal modes. Using this method, we demon

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Fang, Qiang. "2 μm Pulsed Fiber Laser Sources and Their Application in Terahertz Generation". Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/232475.

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In this dissertation, an all-fiber-based single frequency nanosecond pulsed laser system at ~ 1918.4 nm in master-oscillator-power-amplifier (MOPA) configuration is present. The nanosecond pulse seed is achieved by directly modulating a continuous wave (CW) single frequency fiber laser using a fast electro-optical modulator (EOM) driven by an arbitrary waveform generator (AWG). One piece of single mode, large core, polarization-maintaining (PM) highly thulium-doped (Tm-doped) germanate glass fiber (LC-TGF) is used to boost the pulse power and pulse energy of these modulated pulses in the final

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18

Armanious, Miena Magdi Hakeem. "DESIGN AND ANALYSIS OF A HIGH POWER MODERATE BAND RADIATOR USING A SWITCHED OSCILLATOR." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/195937.

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Quarter-wave switched oscillators (SWOs) are an important technology for the generation of high-power, moderate bandwidth (mesoband) wave forms. The use of SWOs in high power microwave sources has been discussed for the past 10 years [1-6], but a detailed discussion of the design of this type of oscillators for particular waveforms has been lacking. In this dissertation I develop a design methodology for a realization of SWOs, also known as MATRIX oscillators in the scientific community.A key element in the design of SWOs is the self-breakdown switch, which is created by a large electric field

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19

Pham, Cécil. "Sources laser de puissance à semi-conducteurs 1,55µm pour transmission en espace libre et applications LIDAR." Thesis, Toulouse, ISAE, 2019. http://www.theses.fr/2019ESAE0021/document.

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Les transmissions optiques en espace libre pour des liaisons satellite-satellite ou satellite-sol sont en plein essor. Les systèmes les plus performants aujourd’hui reposent sur l’utilisation de laser à état solide ou d’émetteurs en configuration Master Oscillator Power Amplifier (MOPA) comprenant une source laser, un modulateur externe et un amplificateur fibré type Erbium Doped Fiber Amplifier (EDFA). Ces deux types de sources laser présentent plusieurs inconvénients qui peuvent être rédhibitoires dans le cadre d’applications spatiales : poids et taille élevés, sensibilité aux radiations, fo

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20

Parsa, Shahrzad. "High-power fiber-laser-pumped picosecond nonlinear optical sources from the near- to mid-infrared." Doctoral thesis, Universitat Politècnica de Catalunya, 2018. http://hdl.handle.net/10803/620786.

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Ultrafast picosecond coherent sources in the near-to-mid-infrared (IR) spectral range are of great interest for a variety of applications such as pump-probe spectroscopy, remote sensing, photobiology and novel upconversion imaging techniques. Nonlinear optics, and in particular nonlinear frequency conversion techniques, offer an efficient and effective approach towards the realization of sources emitting such radiation, as nowadays, nonlinear frequency conversion technologies are recognised to be viable and reliable sources of laser radiation with broad wavelength tunability and power scalabil

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21

Gleva, Mark. "Enhanced active cooling of high power led light sources by utilizing shrouds and radial fins." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29726.

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Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Graham, Samuel; Committee Member: Joshi, Yogendra; Committee Member: Kumar, Satish. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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22

Masanotti, Delia. "Novel design and development of high power with high brightness optical sources using a coherently coupled array of semiconductor lasers." Thesis, University of Bath, 2005. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420868.

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23

Taheri, Najafabadi Amin. "High-yield production of graphene sheets by graphite electro-exfoliation for application in electrochemical power sources." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/59330.

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This thesis first aims at developing an electrochemical approach for low temperature, simple, and cost-effective synthesis of graphene microsheets (GNs) using graphitic electrodes in ionic liquid (IL) medium. The second major focus involves the products application as cathode-modifying microporous layers (MPLs) in proton exchange membrane fuel cells (PEMFCs) as well as anode-modifying materials in microbial fuel cells (MFCs). For the electrochemical exfoliation, a novel IL/acetonitrile electrolyte is introduced, and investigated with low concentration of ionic liquids. Using iso-molded graphit

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24

Mingardi, Andrea. "THz Sources Based on Er-Doped GaAs Driven at Telecom-Fiber Wavelengths." Wright State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1546855664095384.

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25

Spießberger, Stefan [Verfasser], and Günther [Akademischer Betreuer] Tränkle. "Compact semiconductor-based laser sources with narrow linewidth and high output power / Stefan Spießberger. Betreuer: Günther Tränkle." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2012. http://d-nb.info/1026483859/34.

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Seidel, Marcus [Verfasser], and Ferenc [Akademischer Betreuer] Krausz. "A new generation of high-power, waveform controlled, few-cycle light sources / Marcus Seidel ; Betreuer: Ferenc Krausz." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2018. http://d-nb.info/117907596X/34.

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27

Kim, Jae-Sun. "Hollow optical fibers and W-type fibers for high power sources and suppression of the stimulated Raman scattering." Thesis, University of Southampton, 2006. https://eprints.soton.ac.uk/46858/.

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In this thesis, theoretical and experimental studies on hollow optical fibers (HOFs) and depressed clad hollow optical fibers (DCHOFs) for cladding-pumped high power fiber laser sources, operating at a wavelength range 900 - 1100 nm, are reported. In addition, the suppression of the stimulated Raman scattering (SRS) in a single-mode high power fiber-based master oscillator power amplifier (MOPA) source, using W-type Yb The suppression of the stimulated Raman scattering (SRS) in a small and single-mode core becomes an issue when considering the power scaling of a fiber laser. Here a W-type fibe

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28

Kormin, Dmitrii [Verfasser], and Ferenc [Akademischer Betreuer] Krausz. "Development of high power pump laser for future sources of isolated attosecond pulses / Dmitrii Kormin ; Betreuer: Ferenc Krausz." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2021. http://d-nb.info/1238017339/34.

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29

Auer, Sabine. "The Stability and Control of Power Grids with High Renewable Energy Share." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/18978.

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Die vorliegende Dissertation untersucht die Stabilität und Regelung von Stromnetzen mit hohem Anteil Erneuerbarer Energien (EE). Dabei stehen drei Forschungsfragen, zu den neuartigen Herausforderungen für die zukünftige Stromnetzstabilität im Zuge der Energiewende, im Vordergrund. Erstens soll untersucht werden wie die Resilienz von Stromnetzen gemessen und im zweiten Schritt auch verbessert werden kann. Dabei zeige ich den notwendigen Detailgrad für transiente Stabilitätsuntersuchungen auf. Die zweite Frage lautet wie, trotz des zunehmenden Ausbaus von EE in Verteilnetzen, die statische S

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Hage, Arvid. "Development of harmonic generation sources and characterisation of UV and XUV radiation at high power and free-electron lasers." Thesis, Queen's University Belfast, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.680085.

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The main topic of this thesis was to develop XUV sources for direct seeding and UV sources for high-gain harmonic generation (HGHG) at the second undulator beamline of the Free-Electron Laser in Hamburg (FLASH2). The thesis is divided into three topics: (i) UV- and (ii) XUV-seed sources and (iii) the seeding and diagnostic setups of FLASH2. In the UV section the opportunity to seed FLASH2 with HGHG is investigated. The seed radiation is generated with a purpose-built optical parametric chirped pulse amplifier (OPCPA) operating in a 10 Hz burst mode with an intra burst repetition rate of 100 kH

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31

Kalita, Mridu P. "Development of bismuth doped silica fibres for high power sources & long wavelength generation from ytterbium doped fibre lasers." Thesis, University of Southampton, 2010. https://eprints.soton.ac.uk/185965/.

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A detailed study of fabrication and characterisation of bismuth (Bi) doped silica optical fibre has been investigated. Three different fibre fabrication techniques were applied to study the possible influence on Bi-luminescence: modified chemical vapour deposition (MCVD) and the solution doping technique, MCVD chemicalin- crucible deposition technique and the powder-in-tube (PIT) technique. Spectroscopic absorption and Bi luminescence and fluorescence decay properties under different pumping wavelengths and with different host glass compositions are presented and provide important information

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32

Chaitanya, Kumar Suddapalli. "High-power, fiber-laser-pumped optical parametric oscillators from the visible to mid-infrared." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/83528.

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High-power, continuous-wave (cw), mid-infrared (mid-IR) laser sources are of interest for variety of applications such as trace gas detection and remote sensing, which require broad spectral coverage to address the most prominent absorption features of a wide range of molecular species particularly in the mid-IR fingerprint region. On the other hand, surgical applications require high energy sources with unique pulse structure at specific wavelength in the mid-IR ranging from 6-6.5 m. Optical parametric oscillators (OPOs) offer potential sources for all the above applications. The outp

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33

Hosseini, Seyedeh Sona. "Tunable Reflective Spatial Heterodyne Spectrometer| A Technique for High Resolving Power, Wide Field Of View Observation Of Diffuse Emission Line Sources." Thesis, University of California, Davis, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3736922.

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<p> The purpose of this dissertation is to discuss the need for new technology in broadband high-resolution spectroscopy based on the emerging technique of Spatial Heterodyne Spectroscopy (SHS) and to propose new solutions that should enhance and generalize this technology to other fields. Spectroscopy is a proven tool for determining compositional and other properties of remote objects. Narrow band imaging and low resolving spectroscopic measurements provide information about composition, photochemical evolution, energy distribution and density. The extension to high resolving power provides

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Zabihi, Sasan. "Flexible high voltage pulsed power supply for plasma applications." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/48137/1/Sasan_Zabihi_Sheykhrajeh_Thesis.pdf.

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Demands for delivering high instantaneous power in a compressed form (pulse shape) have widely increased during recent decades. The flexible shapes with variable pulse specifications offered by pulsed power have made it a practical and effective supply method for an extensive range of applications. In particular, the release of basic subatomic particles (i.e. electron, proton and neutron) in an atom (ionization process) and the synthesizing of molecules to form ions or other molecules are among those reactions that necessitate large amount of instantaneous power. In addition to the decompositi

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35

Guiraud, Germain. "Développement de sources laser à fibres dopées ytterbium haute puissance, monofréquence et à bas bruit d'intensité." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0648.

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Les sources laser à fibre, haute puissance et de faible largeur spectrale sont de plus en plus utiles pour des applications à la fois industrielle et scientifique. Cependant, le développement de ces sources est limité par les seuils d’apparition d’effets non-linéaires tels que la Diffusion Brillouin Stimulée (DBS) du fait d’un fort confinement de la lumière dans le coeur de la fibre. Un premier amplificateur en régime monofréquence de puissance moyenne égale à 50W a été développé à partir d’une diode laser signal de 50 mW. L’étude du bruit d’intensité sur cet amplificateur a montré que l’utili

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Zubo, Rana H. A. "Distribution Network Operation with High Penetration of Renewable Energy Sources. Joint Active/Reactive Power Procurement: A Market-Based Approach for Operation of Distribution Network." Thesis, University of Bradford, 2019. http://hdl.handle.net/10454/18267.

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Distributed generators (DGs) are proposed as a possible solution to supply economic and reliable electricity to customers. It is adapted to overcome the challenges that are characterized by centralized generation such as transmission and distribution losses, high cost of fossil fuels and environmental damage. This work presents the basic principles of integrating renewable DGs in low voltage distribution networks and particularly focuses on the operation of DG installations and their impacts on active and reactive power. In this thesis, a novel technique that applies the stochast

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Ghawas, Muhammad. "Sources picosecondes et femtosecondes à base de fibre dopées Ytterbium et applications." Electronic Thesis or Diss., Bordeaux, 2023. http://www.theses.fr/2023BORD0463.

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Les recherches industrielles ou académiques autour laser délivrant des impulsions ultracourtes reposent de plus en plus sur la technologie des lasers à fibre. Elles s’appuient sur les avantages intrinsèques des systèmes à fibre, tels que leur stabilité, compacité, l'excellente qualité modale du faisceau délivré, leur robustesse et leur facilité d'utilisation. Au cours de ce travail, nous avons réalisé l’étude détaillée d’un laser à fibre délivrant des impulsions picosecondes fonctionnant dans un régime de dispersion normale (ANDi). Ce laser a par la suite été déployé pour étudier de la générat

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Kuhn, Vincent [Verfasser]. "Near diffraction limited high-power narrow-linewidth Er3+-doped fiber amplifiers : developments towards laser sources at 1.5 [my]m wavelength for gravitational wave astronomy / Vincent Kuhn." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2012. http://d-nb.info/101994398X/34.

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Wulf, Frank [Verfasser], Clara J. [Gutachter] Saraceno, and Franz X. [Gutachter] Kärtner. "Novel high power THz sources driven by mode-locked thin-disk lasers / Frank Wulf ; Gutachter: Clara J. Saraceno, Franz X. Kärtner ; Fakultät für Elektrotechnik und Informationstechnik." Bochum : Ruhr-Universität Bochum, 2021. http://d-nb.info/1227710380/34.

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Syranidou, Chloi Verfasser], Detlef [Akademischer Betreuer] [Stolten, and Armin [Akademischer Betreuer] Schnettler. "Integration of renewable energy sources into the future European power system using a verified dispatch model with high spatiotemporal resolution / Chloi Syranidou ; Detlef Stolten, Armin Schnettler." Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://d-nb.info/122540164X/34.

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Wang, Huan. "Study of an Optical Enhancement Cavity for Thomson Scattering Light Sources." Thesis, université Paris-Saclay, 2020. https://tel.archives-ouvertes.fr/tel-03179872.

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Les cavités d'amélioration optique (OEC) de puissance moyenne élevée ont un large éventail d'applications, y compris la diffusion Thomson produisant des rayons X / gamma quai monochromatiques à flux moyen élevé, la génération d'harmoniques d'ordre élevé (HHG) améliorée par cavité, les interféromètres à ondes gravitationnelles, Sources de lumière de microbunching en régime permanent (SSMB) et expériences d'énergie de fusion, etc. Les travaux de cette thèse se concentrent sur les études théoriques et expérimentales des OEC de puissance moyenne élevée dédiées aux sources lumineuses diffusantes Th

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Hegenbarth, Robin [Verfasser], and Harald [Akademischer Betreuer] Gießen. "High-power broadband femtosecond near- and mid-infrared sources based on optical parametric oscillators and difference frequency generation at 40 MHz repetition rates / Robin Hegenbarth. Betreuer: Harald Gießen." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2014. http://d-nb.info/1049688791/34.

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43

Laurain, Alexandre. "Sources laser à semiconducteur à émission verticale de haute cohérence et de forte puissance dans le proche et le moyen infrarouge." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2010. http://tel.archives-ouvertes.fr/tel-00613743.

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Le développement de sources lasers monomodes et accordables constitue un enjeu important dans plusieurs domaines en fort développement telle que la métrologie, les senseurs optiques, la spectroscopie, le traitement optique de l'information ou la médecine. Dans cette thèse nous faisons le point sur les limites des technologies actuelles, puis nous montrons comment les surpasser à travers la conception et l'étude physique de lasers à semiconducteur de haute cohérence émettant dans l'infrarouge. Nous nous intéressons particulièrement aux VECSEL dans le but d'obtenir un fonctionnement monofréquenc

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44

Machinet, Guillaume. "Développement de sources lasers femtosecondes ytterbium à très haute cadence et applications." Thesis, Bordeaux 1, 2013. http://www.theses.fr/2013BOR14999/document.

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Ce travail de thèse est consacré au développement de sources lasers femtosecondes à haute cadence, de forte puissancemoyenne (>10 W) avec des énergies supérieures à 100 μJ. Ce type de sources est primordial pour le développementd’applications industrielles variées (micro-usinage athermique, chirurgie oculaire, …) ainsi qu’en recherchefondamentale pour l’étude de l’interaction laser matière.Après un chapitre d’introduction sur l’état de l’art des chaînes lasers de forte puissance moyenne à base de matériauxdopés ytterbium, la réalisation d’une chaîne laser de forte puissance moyenne compacte

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Abbouab, Clara. "Étude et conception de sources laser fibrées monomodes en régime continu multi-kW." Electronic Thesis or Diss., Limoges, 2023. http://www.theses.fr/2023LIMO0088.

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Les travaux présentés dans ce manuscrit s’inscrivent dans le cadre d’une thèse CIFRE en collaboration entre le laboratoire XLIM et la compagnie industrielle des laser « CILAS ». L'objectif principal de cette thèse est l'étude et la conception de sources laser fibrées émettant en régime continu des faisceaux monomodes de puissance multi-kW. L'architecture « MOPA » (composée d’une oscillateur maître et d’un amplificateur de puissance), a été sélectionnée à l'aide de la bibliographie pour atteindre ces objectifs, puis a été réalisée à XLIM. En améliorant cette architecture, la source fibrée a dél

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46

Abdin, Adam. "Techno-economic modeling and robust optimization of power systems planning under a high share of renewable energy sources and extreme weather events An integrated framework for operational flexibility assessment in multi-period power system planning with renewable energy production." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC046.

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Les objectifs récents en ce qui concerne la durabilité des systèmes électriques et l'atténuation des menaces liées au changement climatique modifient la portée des exigences de planification de ces systèmes. D'une part, les systèmes durables d'énergie à faible émission de carbone qui comportent une part élevée de sources d'énergie renouvelables intermittentes(IRES) se caractérisent par une forte augmentation de la variabilité intertemporelle et nécessitent des systèmes flexibles capables d'assurer la sécurité de l'approvisionnement électrique. D'autre part, la fréquence et la gravité accrues d

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Jain, Palak. "Studies and experimental activities to qualify the behaviour of RF power circuits for Negative Ion Sources of Neutral Beam Injectors for ITER and fusion experiments." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3425385.

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The International Thermonuclear Experimental reactor (ITER), the world’s largest experimental facility in the realm of nuclear fusion for energy production, requires two Neutral Beam Injectors (NBI) rated for the total power of 33 MW for plasma heating and current drive. The ITER NBI includes an ion source which can produce 40 A of D¯ ions beams for 3600 s, accelerated at the energy of 1 MeV. The requirements for the ITER NBI are quite demanding and have never been achieved before all together in a single device. This specifically called for a development of the ITER Neutral Beam Test Facility

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Butcher, Nicholas David. "Active Paralleling of High Power Voltage Source Inverters." Thesis, University of Canterbury. Electrical and Computer, 2007. http://hdl.handle.net/10092/3430.

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Power electronics are becoming established in ever broadening areas of industry. The transition from previous generation technology is driven by the oportunity for improvements in controllability, efficiency, and longevity. A wide variety of power semiconductors are available, however power handling capacity is still a significant limitation for many applications. An increase in the capacity of a single device is usually accompanied by a drop in switching frequency, and hence achievable system bandwidth. Increased capacity can be attained without this loss in bandwidth by using multiple lower

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O'Connor, Kevin A. Curry Randy D. "Compact power conditioning and RF systems for a high power RF source." Diss., Columbia, Mo. : University of Missouri--Columbia, 2008. http://hdl.handle.net/10355/6285.

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Title from PDF of title page (University of Missouri--Columbia, viewed on Feb. 19, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Dr. Randy Curry, Thesis Supervisor Includes bibliographical references.

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Rodrigues, Alcide Conceicao Do Rosario. "A high performance transistorised power source for MIG welding." Thesis, University of Leicester, 1986. http://hdl.handle.net/2381/34817.

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This research concerns an investigation into the application of Power Electronics to high performance power sources for precise and efficient control of the pulsed-current metal-inert gas (PCM) welding processes. The physical processes of the welding arc are reviewed and the characteristics of a number of power sources are considered prior to preparing the operational specification for the PCM power source. From a number of possibilities the high frequency switching regulator operating in the secondary side of the power transformer was selected for detailed study. The power source was based on

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