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Dissertations / Theses on the topic 'Intensité relativiste'

Author: Grafiati
Published: 1 June 2024
Last updated: 31 July 2025

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1

Ouillé, Marie. "Génération d'impulsions laser proches du cycle optique en durée pour l'interaction laser-matière relativiste à haute cadence." Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. http://www.theses.fr/2022IPPAE007.

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Cette thèse expérimentale s’est essentiellement déroulée au Laboratoire d’Optique Appliquée à Palaiseau (France), sur un système laser capable de générer des impulsions proches du cycle optique en durée avec des énergies de plusieurs mJ à une cadence de 1 kHz : la Salle Noire 2. Ce système laser Titane:Sapphire est double CPA avec un filtre non-linéaire entre les deux étages (basé sur la génération d’onde de polarisation croisée ou ‘XPW’) pour améliorer le contraste temporel, suivi d’un étage de post-compression dans une fibre flexible étirée à cœur creux. Grâce à ce système, nous étudions l’i
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2

Leblanc, Adrien. "Miroirs et réseaux plasmas en champs lasers ultra-intenses : génération d’harmoniques d’ordre élevé et de faisceaux d’électrons relativistes." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS384/document.

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Lors de la focalisation d’un laser femtoseconde ultra-intense [I>10¹⁶W/cm²] sur une cible solide, dès le début de l’impulsion le champ laser est suffisant pour totalement ioniser la surface de la cible. Le reste de l’impulsion est ensuite réfléchi dans la direction spéculaire par le plasma dense ainsi créé : c’est un miroir plasma. Le champ laser ultra-intense peut accélérer les électrons au sein du plasma à des vitesses relativistes. Certains sont éjectés vers le vide et ces miroirs plasmas sont ainsi des sources de faisceaux d’électrons énergétiques. De plus, ils rayonnent dans l’extrême
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3

Chopineau, Ludovic. "Physique attoseconde relativiste sur miroirs plasmas." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS132/document.

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Lors de la réflexion d’un laser femtoseconde ultra-intense [Iʟ > 10¹⁶ W/cm²] sur une cible solide, celle-ci est ionisée dès les premiers cycles de l’impulsion. Un plasma se détend alors vers le vide avec un profil exponentiel de longueur caractéristique Lg. Pour de faibles longueurs de gradient Lg < λʟ, le gradient plasma est considéré comme raide, il réfléchit spéculairement l’impulsion incidente : c’est un miroir plasma. De tels plasmas, réfléchissant pour la lumière, sont aujourd’hui exploités dans différentes applications scientifiques, comme l’accélération de particules par laser ou
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4

Kiefer, Daniel. "Relativistic electron mirrors from high intensity laser nanofoil interactions." Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-153796.

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5

Kjellsson, Lindblom Tor. "Relativistic light-matter interaction." Doctoral thesis, Stockholms universitet, Fysikum, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-147749.

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During the past decades, the development of laser technology has produced pulses with increasingly higher peak intensities. These can now be made such that their strength rivals, and even exceeds, the atomic potential at the typical distance of an electron from the nucleus. To understand the induced dynamics, one can not rely on perturbative methods and must instead try to get as close to the full machinery of quantum mechanics as practically possible. With increasing field strength, many exotic interactions such as magnetic, relativistic and higher order electric effects may start to play a s
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6

Kiefer, Daniel [Verfasser], and Jörg [Akademischer Betreuer] Schreiber. "Relativistic electron mirrors from high intensity laser nanofoil interactions / Daniel Kiefer. Betreuer: Jörg Schreiber." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2012. http://d-nb.info/1032131314/34.

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7

Zaim, Neïl. "Modeling electron acceleration driven by relativistic intensity few-cycle laser pulses on overdense plasmas." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLX089.

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Nous étudions dans cette thèse théorique et numérique l'accélération d'électrons lors de l'interaction entre une impulsion laser d'intensité relativiste et un plasma surdense. Cette interaction est très sensible au profil de densité sur la face avant du plasma et deux régimes différents, correspondant à deux thématiques de recherche développées dans cette thèse, peuvent être considérés.Premièrement, pour des interfaces plasma-vide très abruptes, les mécanismes menant à l'émission d'électrons sont bien compris. Les électrons gagnent en particulier une grande quantité d'énergie lors de leur inte
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8

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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9

Coury, Mireille. "Generation and transport of high-current relativistic electron beams in high intensity laser-solid interactions." Thesis, University of Strathclyde, 2013. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=20410.

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In this thesis, the generation and transport of ultra-high intensity laser-driven relativistic electron beams in overdense plasma is investigated experimentally and numerically. The fast electron beam is experimentally diagnosed by means of a 2D Cu Ka imager and the TNSA-generated proton beam. Analytical models together with a 3D hybrid-PIC code are employed to simulate the beam properties in solids. The effects of the self-generated fields on the fast electron beam transport, the effect of the preplasma density scale length on the laser energy coupling to fast electrons and the influence of t
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10

Wilz, Mackenzie Charles. "Focused investigations of relativistic electron burst intensity, range, and dynamics space weather mission global positioning system." Montana State University, 2011. http://etd.lib.montana.edu/etd/2011/wilz/WilzM0511.pdf.

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The FIREBIRD mission (Focused Investigations of Relativistic Electron Burst Intensity, Range, and Dynamics) is a low earth orbit, space weather, CubeSat mission which is comprised of a two satellite constellation. This constellation is responsible for the measurement of relativistic electron microbursts with very fine spatial and temporal resolution. To achieve the spatial and temporal requirements of the mission, a global positioning system (GPS), for the purpose of navigation position and timing, is to be implemented on both satellites within the constellation. The integration and testing of
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11

López, Noriega Mercedes. "Pion interferometry in AuAu collisions at a center of mass energy per nucleon of 200 GeV." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1092077196.

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12

Maclossi, Mauro. "Transport dans la matière sous dense et sur dense d'un faisceau d'électrons relativistes, produit par l'interaction d'une impulsion laser à ultra haute intensité." Palaiseau, Ecole polytechnique, 2006. http://www.theses.fr/2006EPXX0063.

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13

Cunningham, Eric Flint. "Photoemission by Large Electron Wave Packets Emitted Out the Side of a Relativistic Laser Focus." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/3054.

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There are at least two common models for calculating the photoemission of accelerated electrons. The 'extended-charge-distribution' method uses the quantum probability current (multiplied by the electron charge) as a source current for Maxwell's equations. The 'point-like-emitter' method treats the electron like a point particle instead of like a diffuse body of charge. Our goal is to differentiate between these two viewpoints empirically. To do this, we consider a large electron wave packet in a high-intensity laser field, in which case the two viewpoints predict measurable photoemission rate
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14

Iwata, Natsumi. "Nonlocal theory of relativistic ponderomotive force in high intensity lasers based on the phase space Lagrangian and the role in the interaction with various mediums." Kyoto University, 2014. http://hdl.handle.net/2433/188822.

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15

Tarbox, Grayson J. "Simulations of Electron Trajectories in an Intense Laser Focus for Photon Scattering Experiments." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5828.

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An experiment currently underway at BYU is designed to test whether the size of a free electron wave packet affects the character of scattered radiation. Using a semi-classical argument wherein the wave packet is treated as a diffuse charge distribution, one would expect strong suppression of radiation in the direction perpendicular to the propagating field as the wave packet grows in size to be comparable to the wavelength of the driving field. If one disallows the interaction of the wave packet with itself, as is the case when calculating the rate of emission using QED, then regardless of si
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16

Kang, Nai-Hau, and 康迺豪. "Simulation Study of Relativistic Birefringence Induced by High-Intensity Laser Field in the Plasma." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/10067544975671651681.

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17

Yu-Jie, Ou, and 歐昱傑. "A study of personal moral philosophy, moral decision-making and intensity, critical thinking intention in news issues on Facebook influence on opinion sharing for user-Perspectives on Idealism and Relativism." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/83478558005688441397.

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碩士<br>國立高雄師範大學<br>資訊教育研究所<br>101<br>In today’s society, the rise of Information Techonology facilitate people to receive various news by a lot of pipelines,such as Social Network Sites.Everyone can express their own opinions in post-modern society.Therefore,the core of this study would realize the people who use the new techolonogy to watch news on Facebook,the types of personal moral judgement to influence on opinion sharing after news events have occured . This study created the online questionnaires survey, a total of 249 questionnaires returned, 232 questionnaires were available.The respon
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18

RUIJTER, MARCEL. "Radiation effects for the next generation of synchrotron radiation facilities." Doctoral thesis, 2022. http://hdl.handle.net/11573/1636547.

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High energy radiation is an important tool for many fields of research as it allows for the measurement of smaller structures and atomic interactions. The current best method of generating coherent and narrow bandwidth synchrotron radiation is with a free electron laser. It requires very high charge density, to start the amplification process and concurrently leads to its high level of coherency, and high energies (GeV to obtain keV photons). The stringent parameters on the electron bunch are met by linear accelerators. These are typically kilometre long straight structures that operate from
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