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Rozprawy doktorskie na temat „Travelling Wave Tube”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Tan, Yap Soon. "Modeling of folded waveguide travelling wave tube." Thesis, University of Liverpool, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437521.

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Abduljalil, Abdulrahman S. Ahmed. "Investigation of thermoacoustic processes in a travelling-wave looped-tube thermoacoustic engine." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/investigation-of-thermoacoustic-processes-in-a-travellingwave-loopedtube-thermoacoustic-engine(f46f9345-d1b5-40a4-8388-f884d7adb7bc).html.

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In thermoacoustic devices, thermal energy is directly converted to an acoustic wave (mechanical energy) or an acoustic input is converted into thermal energy. This is a result of heat interaction between a solid material and adjacent gas, within the so-called ‘‘thermal penetration depth” of the compressible oscillatory flow. Thermoacoustic technology is receiving growing interest in research for its many advantages, such as having no moving parts, being environmentally friendly and the possibility of using renewable energy for its operation (Adeff and Hofler, 2000). However, this technology is

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Browne, Jefferson Andrew. "A 2.5-D large-signal gain coupled-cavity travelling-wave tube model." Thesis, Lancaster University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322520.

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4

Hazell, Jonathan. "New slow wave structures for travelling wave tubes." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/59703.

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This thesis covers the design of slow wave structures for travelling wave tubes, with a specific focus on those that could be used for operation at millimetre or shorter wavelengths. Serpentine and a coupled cavity photonic crystal structure are covered in detail, together with the interaction between the electromagnetic waves they support and the electron gun and magnetic beam focusing systems needed for a travelling wave interaction. In Chapter 2, the existing small-signal theory of the travelling wave interaction is introduced and applied to a serpentine travelling wave tube. A set of synth

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5

LOPES, DANIEL T. "Caracterização de estruturas de ondas lentas helicoidais para utilização em, TWT de potência." reponame:Repositório Institucional do IPEN, 2007. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11596.

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6

Srivastava, Y. "Large signal modelling of coupled-cavity travelling wave tubes." Thesis, Lancaster University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379740.

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7

Hupin, Sébastien. "Caractérisation d’auto-assemblages de polyoxométallates hybrides organiques-inorganiques par spectrométrie de mobilité ionique couplée à la spectrométrie de masse." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMR062.

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Les polyoxométallates (POM) sont des composés anioniques constitués par l’assemblage de polyèdres d’oxydes métalliques {MOy}, (avec M, MoVI ou WVI) reliés entre eux par des atomes d'oxygène. Les POM forment ainsi une classe remarquable de clusters d’oxydes métalliques inorganiques nanométriques, avec une grande variété de charges et de structures. Il est possible de former des systèmes hybrides incluant la partie inorganique du POM et une partie organique greffée, permettant d’apporter de nouvelles fonctionnalités aux POM, tel que l’auto-assemblage. Nous avons consacré ces travaux de thèse à l

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8

McGregor, A. "Periodic magnet focussing of electron beams in travelling wave tubes." Thesis, Lancaster University, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376707.

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9

TENORIO, EIK. "Análise via simulação computacional de uma estrutura de ondas lentas." reponame:Repositório Institucional do IPEN, 2004. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9289.

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10

LOPES, DANIEL T. "Análise multi-sinal e caracterização experimental de válvulas de ondas progressivas (TWT) para aplicação em amplificadores de micro-ondas." reponame:Repositório Institucional do IPEN, 2012. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10089.

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11

PERIGO, ELIO A. "Desenvolvimento de um focalizador magnético utilizando um arranjo periódico de ímãs permanentes para aplicaçãao em dispositivos de microondas de potência." reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11338.

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Made available in DSpace on 2014-10-09T12:50:50Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:58:24Z (GMT). No. of bitstreams: 1 11097.pdf: 8468953 bytes, checksum: 884442a7a2e945eacad452d3697f2149 (MD5)<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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12

Martinez, Thomas. "Etude d'un transformateur piézoélectrique à onde progressive et de son application aux convertisseurs de puissance." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN047/document.

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Les transformateurs piézoélectriques présentent de nombreux intérêts en électronique de puissance par rapport aux transformateurs magnétiques : gains en tension élevé, forte densité de puissance, compacité, rendements élevés, forte isolation galvanique et faibles rayonnement électromagnétiques. Toutefois, les structures classiques sont basées sur la génération d’une onde stationnaire qui limite le nombre d’électrodes et de tensions disponibles en sortie. Dans cette thèse, nous proposons une nouvelle topologie de transformateur piézoélectrique qui utilise une onde progressive au lieu d’une onde

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13

HIGASHI, CRISTIANE. "Investigação do processo de obtenção de aluminatos de bário e cálcio para construção e caracterização de catodos termiônicos impregnados para a aplicação em dispositivos de microondas de potência." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11463.

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Made available in DSpace on 2014-10-09T12:52:11Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:57:49Z (GMT). No. of bitstreams: 0<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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14

Reynolds, Christopher Garth. "The analysis, simulation and testing of an experimental travelling- wave tube." Thesis, 1994. http://hdl.handle.net/10413/6899.

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As a design and analysis aid for the development of an experimental TWT, a computer program is written which allows the small-signal gain to be computed for various operating conditions, such as various conditions of tube bias (beam voltage and current) and frequency. In order to arrive at a value for the gain, a number of parameters need first to be defined or calculated. Using the method (Approach II) of Jain and Basu [17] which is applicable to a helix with a free-space gap between it and circular dielectric support rods surrounded by a metal shell, the dielectric loading factor (DLF) for t

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15

Vassilopoulos, Nicolaos. "The development of an experimental, low profile, broadband travelling wave tube amplifier." Thesis, 1994. http://hdl.handle.net/10413/6907.

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An experimental, field replaceable travelling wave tube (TWT) with low profile, TEM transitions has been developed with the aim of combining the cost advantages of field replaceable TWTs with the bandwidth advantages of TEM transitions. Field replaceable TWTs are cheaper because their periodic permanent magnet (PPM) stacks (which are expensive) are easier to produce and can be reused. Standard TEM transitions have a high profile and prevent TWTs from being plugged into PPM stacks. The stacks of packaged TWTs are therefore built onto the tubes, using split ring magnets, before the tubes are pot

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16

Joe, Jurianto. "Experimental and theoretical investigations of rectangular grating slow wave structure for low-voltage travelling wave tube amplifiers." 1996. http://catalog.hathitrust.org/api/volumes/oclc/35733107.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1996.<br>Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 129-132).

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17

Ham, Ronald Edgar. "Travelling-wave frequency conversion." Thesis, 1985. http://hdl.handle.net/10413/6892.

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Travelling-wave distributed amplifiers are providing gain over broad frequency ranges for microwave applications. Similar concepts are applicable to distributed mixers and, with the use of controlled feedback, to a multifunction component simultaneously emulating a mixer, amplifier and an oscillator. The concept of this new travelling-wave frequency converter is introduced and data for a discrete component test circuit is presented. To facilitate the converter operation a new three-port travelling-wave mixer is introduced and characterized. Four-port scattering and wave scattering transformati

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18

Foulis, Bruce David. "A gridless, variable perveance Pierce electron gun." Thesis, 1994. http://hdl.handle.net/10413/6885.

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This thesis covers the design and development of a modulated Pierce electron gun used in the construction of experimental travelling wave tube (TWT) amplifiers. The gun incorporated an open aperture switching electrode, positioned mid-way between anode and cathode, to pulse the beam. This method of modulation did not have the same adverse effects on electron trajectories as in the case of a conventional mesh grid, but rather the electrode could be used to alter the focus conditions within the gun and subsequently improve certain beam characteristics. Ion focusing effects could also be eliminat

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19

Hemanth, G. "FEM Based Stochastic Analysis of Tolerance in Electromagnetic Periodic Structures." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4250.

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Solution of Maxwell's equations is required to model and analyse electromagnetic behaviour of circuits, components and systems. These equations being partial differ finial equations of vector field quantities with spatial and time variations, are difficult to solve analytically except for a handful of problems. Numerical approaches such as _finite difference time domain (FDTD) method, finite element method (FEM) and method of moments (MOM) etc. have been developed and a several commercial software packages are available based on these methods. However, these commercial tools based on FEM strug

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