Relevant bibliographies by topics / Multipaction / Dissertations / Theses
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Dissertations / Theses on the topic 'Multipaction'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

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1

Janzon, Alexandra. "Applications and Limitations of the Hybrid L1/L2Multicarrier Analysis Method." Thesis, Luleå tekniska universitet, Rymdteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-86347.

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The multipactor phenomenon is a major concern in modern satellites that operate with highpower transmission in many frequency bands. It occurs when electrons inside RF componentsare accelerated by the RF fields. These electrons then hit walls inside the device, produc-ing secondary electrons. As the number of electrons increases, it may create noise inside thecomponent, thus deteriorating the original signal-to-noise ratio. When designing radio fre-quency equipment for space applications, it is therefore important to know at which powerlevels this occurs. Multicarrier simulations are time cons
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2

Anza, Hormigo Sergio. "Multipactor in Multicarrier Systems. Theory and Prediction." Doctoral thesis, Universitat Politècnica de València, 2014. http://hdl.handle.net/10251/38761.

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This work presents a new theoretical framework and prediction tool for multipactor in multi-carrier systems. This is of capital importance for satellite communication applications, which demand for higher number of channels operating at high power levels. Such a tool may help to reduce, or completely avoid, the risk of having an RF breakdown in operation, with the subsequent loss of signal quality or even completely damage of the device. Currently not much is known about multipactor for multi-carrier signals. This Thesis throws light on some basic multipactor mechanisms such as the ele
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3

Goudket, Philippe Andre. "A study of multipacting in rectangular waveguide geometries." Thesis, Lancaster University, 2004. http://eprints.lancs.ac.uk/76622/.

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Electron multipacting is a resonant process by which electrons build-up under the influence of a radio-frequency (RF) field. This process can occur in evacuated RF equipment such as the input coupler of accelerator cavities. The superconducting RF cavities designed by Cornell University, that are used in a number of synchrotron light sources including the DIAMOND Light Source, have had a history of vacuum breakdown in the CESR ring at Cornell with frequencies that would be inappropriate for a reliable synchrotron facility. This work aims to understand and correct the problem and ensure smooth
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4

Wang, Sihui. "Secondary electron yield measurements of anti-multipacting surfaces for accelerators." Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/23255.

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Electron cloud is an unwanted effect limiting the performance of particle accelerators with positively charged particle beams of high-intensity and short bunch spacing. However, electron cloud caused by beam induced multipacting can be sufficiently suppressed if the secondary electron yield (SEY) of accelerator chamber surface is lower than unity. Usually, the SEY is reduced by two ways: modification of surface chemistry and engineering the surface roughness. The objective of this PhD project is a systematic study of SEY as a function of various surface related parameters such as surface chemi
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5

Graves, Timothy P. (Timothy Paul). "Experimental investigation of electron multipactor discharges at very high frequency." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/41284.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2006.<br>Includes bibliographical references (p. 159-166).<br>Multipactor discharges are a resonant condition in which electrons impact a surface in phase with an alternating electric field. The discharge is sustained by electron multiplication from secondary emission. As motivation, multipactor discharges can adversely affect many different rf systems in vacuum, and this work provides an improved general understanding of multipactor and gives promising results for improved performance and reliabi
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6

Hill, Christopher Lawrence. "Experimental study of multipactor discharges in a klystron cavity resonator." Thesis, Lancaster University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539671.

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7

Becerra, Gabriel E. (Becerra Toledo). "Studies of coaxial multipactor in the presence of a magnetic field." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41248.

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Thesis (S.M. and S.B.)--Massachusetts Institute of Technology, Dept. of Nuclear Science and Engineering, 2007.<br>Includes bibliographical references (p. 101-107).<br>Multipactor discharges consists of electron multiplication between two surfaces by secondary electron emission in resonance with an alternating electric field. They are detrimental to the performance of radio frequency (RF) systems, such as the ICRF (ion cyclotron range of frequencies) antennas for heating of plasmas in the Alcator C-Mod tokamak and other nuclear fusion devices. This work investigates multipactor discharges in th
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8

Pérez, Pastor Antonio María. "Análisis del efecto multipactor en guías de onda de geometría cilíndrica." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/162975.

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[ES] El propósito de la presente tesis es desarrollar una herramienta informática para la predicción del efecto multipactor tanto en líneas de transmisión coaxiales como en guías circulares. Esta herramienta está pensada para ser complementaria de las de diseño asistido por ordenador Computer-Aided Design (CAD) en el caso de dispositivos de comunicaciones a implementar en estas tecnologías de ondas guiadas. En el caso de guías coaxiales, se desarrollará un modelo numérico para la predicción de los umbrales de potencia del fenómeno de multipactor. Este método ha sido validado con medidas
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9

Hamelin, Thibault. "Validation d'un nouveau logiciel de simulation tridimensionnel du Multipactor par le calcul et l'expérimentation." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112122/document.

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Le multipactor est un phénomène parasite qui se produit dans les dispositifs où l'on transmet une onde hyperfréquence sous vide tels que les tubes électroniques à vide, les cavités résonnantes pour accélérateurs de particules et les circuits micro-ondes à bord des satellites. Il consiste en une avalanche d'électrons mis en mouvement par un champ hyperfréquence. La simulation du multipactor est cruciale dans tout design de structure HF sous vide. Les géométries complexes 3D d'objets imposent de posséder des outils de simulations tridimensionnels pour prédire ce phénomène. Le premier travail de
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10

Hueso, González Jaime. "Analysis of wedge-shaped waveguides and design of multipactor-resistant microwave bandpass filters. Análisis de guías de onda en forma de cuña y diseño de filtros de microondas paso-banda resistentes al efecto multipactor." Doctoral thesis, Editorial Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/33750.

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El efecto multipactor de ruptura en RF ha sido objeto de numerosos estudios desde hace más de 80 años, a partir del desarrollo de los primeros aceleradores de partículas en la primera mitad del siglo XX. A mediados de ese siglo, con el desarrollo de fuentes de alta potencia para aplicaciones radar y la llegada de los satélites artificiales, la investigación del multipactor cobró una considerable relevancia, al convertirse este fenómeno en un riesgo determinante para costosos proyectos comerciales. Las guías de onda con secciones rectas canónicas, como las rectangulares o las coaxiales, h
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11

Jenhani, Hassen. "Coupleurs de puissance HF pour cavités supraconductrices en mode pulsé." Paris 11, 2006. https://tel.archives-ouvertes.fr/tel-00121954.

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Etant des composants complexes, les coupleurs TTF-III pour les cavités supraconductrices du projet XFEL ont un comportement difficile à modéliser ou à prévoir. Ainsi, nos travaux étaient principalement expérimentaux. Dans un premier temps, une automatisation complète du stand de test des coupleurs a été effectuée avec succès. Nous avons réussi, suite à cela, à conditionner une série de coupleurs TTF-III. Ces conditionnements ont permis de réaliser une étude sur les comportements des coupleurs pendant leurs conditionnements HF. Des expériences ont donné une estimation de l’effet de l’étuvage in
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12

Henkel, Christian [Verfasser]. "Multipacting Electron Guns: Development and Results of a Test Setup for Experimental Characterisation Studies / Christian Henkel." Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2021. http://d-nb.info/1237817196/34.

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13

Ylä-Oijala, Pasi. "Multipacting analysis and electromagnetic field computation by the boundary integral equation method in RF cavities and waveguides." Helsinki : University of Helsinki, 1999. http://ethesis.helsinki.fi/julkaisut/mat/rolfn/vk/yla-oijala/.

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14

Fil, Nicolas. "Caractérisation et modélisation des propriétés d’émission électronique sous champ magnétique pour des systèmes RF hautes puissances sujets à l’effet multipactor." Thesis, Toulouse, ISAE, 2017. http://www.theses.fr/2017ESAE0025/document.

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La fusion nucléaire contrôlée par confinement magnétique avec les réacteurs de type Tokamaks et les applications spatiales ont en commun d’utiliser des composants Haute-Fréquence (HF) sous vide à forte puissance. Ces composants peuvent être sujets à l’effet multipactor qui augmente la densité électronique dans le vide au sein des systèmes, ce qui est susceptible d’induire une dégradation des performances des équipements et de détériorer les composants du système. Ces recherches consistent à améliorer la compréhension et la prédiction de ces phénomènes. Dans un premier temps nous avons réalisé
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15

Jenhani, H. "Coupleurs de puissance HF pour cavités supraconductrices en mode pulsé." Phd thesis, Université Paris Sud - Paris XI, 2006. http://tel.archives-ouvertes.fr/tel-00121954.

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Des avancées technologiques très importantes ont permis d'augmenter d'une manière drastique les valeurs des champs accélérateurs dans les cavités supraconductrices. Ces dernières sont devenues très attractives et ont été choisies pour des projets d'accélérateurs de grande ampleur tels que le XFEL et le collisionneur du futur ILC. Le temps de conditionnement HF des coupleurs alimentant les cavités supraconductrices et la quête de fiabilité face aux nouvelles contraintes de fonctionnement sont devenus des priorités pour ces projets internationaux. <br />Etant des composants complexes, les couple
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16

Ludwick, Jonathan. "Physics of High-Power Vacuum Electronic Systems Based on Carbon Nanotube Fiber Field Emitters." University of Cincinnati / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1613745398331048.

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17

Na, Dong-Yeop NA. "Electromagnetic Particle-in-Cell Algorithms on Unstructured Meshes for Kinetic Plasma Simulations." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543398838970791.

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18

Telang, Aviviere. "Efficient Method for Geometry Independent Multipactor Modelling." Thesis, 2009. http://hdl.handle.net/10012/4428.

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As modern satellite communication systems move toward multi-carrier high power communications, there is an increased need for high-power RF devices in the space industry. However, at high-power some RF devices have exhibited an electron plasma (multipactor electron avalanche discharge) that severely damages the RF device and could render it unusable. This is especially a problem in space where repairs to communication equipment is cost-prohibitive. As a result, a number of models have been developed in recent years to predict the onset of multipactor discharge. However, most existing models c
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