Rozprawy doktorskie na temat „Relativistic intensity”
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Kiefer, Daniel. "Relativistic electron mirrors from high intensity laser nanofoil interactions". Diss., lmu, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:19-153796.
Pełny tekst źródłaKjellsson, Lindblom Tor. "Relativistic light-matter interaction". Doctoral thesis, Stockholms universitet, Fysikum, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-147749.
Pełny tekst źródłaKiefer, Daniel [Verfasser], i 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.
Pełny tekst źródłaZaim, 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.
Pełny tekst źródłaThis theoretical and numerical thesis is devoted to electron acceleration from the interaction between a relativistic intensity laser pulse and an overdense plasma. This interaction is very sensitive to the density profile at the plasma front surface and two different regimes, which correspond to two distinct lines of research investigated in this thesis, can be considered.First, for sharp plasma-vacuum interfaces, the mechanisms responsible for electron emission are well understood. The electrons receive in particular a large energy gain from their interaction in vacuum with the reflected laser. We propose to optimize the acceleration by using radially polarized beams, which exhibit a strong longitudinal electric field that can directly accelerate electrons in the laser propagation direction. We show that overdense plasmas lead to more efficient acceleration than other existing methods for injecting electrons into a radially polarized pulse. This result was confirmed by recent experiments performed at CEA Saclay, in which electron acceleration in the longitudinal direction, leading to a decrease in the electron beam angular spread, is demonstrated.Secondly, for larger plasma gradient scale lengths, the interaction is not as well understood. We analyze recent experiments performed in this regime at LOA with few-cycle pulses and find that electrons are accelerated by a laser wakefield formed in the near-critical part of the plasma. This process can only be driven by few-cycle pulses, by virtue of the resonant condition, and is characterized by the rotation of the plasma waves induced by the density gradient
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.
Pełny tekst źródłaWilz, 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.
Pełny tekst źródłaDebayle, 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.
Pełny tekst źródłaThis PhD thesis is a theoretical study of high-current relativistic electron beam transport through solid targets. In the ?rst part, we present an interpretation of a part of experimental results of laser– produced electron beam transport in aluminium foil targets. We have estimated the fast electron beam characteristics and we demonstrated that the collective e?ects dominate the transport in the ?rst tens of µm of propagation. These quantitative estimates were done with the transport models already existing at the beginning of this thesis. These models are no longer su?cient in the case a fast electron beam propagation in insulator targets. Thus, in the second part, we have developed a propagation model of the beam that includes the e?ects of electric ?eld ionization and the collisional ionization by the plasma electrons. We present estimates of the electron energy loss induced by the target ionization, and we discuss its dependence on the beam and target parameters. In the case of a relatively low fast electron density, we demonstrated that the beam creates a plasma where the electons are not in a local thermodynamic equilibrium with ions. We have examined the beam stability and we demonstrated that transverse instabilities can be excited by the relativistic electron beam over the propagation distances of 30 - 300 µm depending on the perturbation wavelength
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.
Pełny tekst źródłaCunningham, 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.
Pełny tekst źródłaOuillé, 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.
Pełny tekst źródłaThis experimental thesis was essentially conducted at Laboratoire d’Optique Appliquée in Palaiseau (France), on a laser system capable of delivering near-single-cycle duration pulses containing a few mJ of energy at 1kHz repetition rate: the Salle Noire 2. This laser is a Titanium:Sapphire double CPA system with a nonlinear filter in between (based on the crossed polarized wave generation effect) for temporal contrast enhancement, followed by a stretched-flexible hollow-core-fiber based post-compression stage. Using this system, we study laser-matter interaction in the relativistic regime at high repetition rate. We can, on one hand, in gas jets, accelerate electrons in the wakefield of the laser up to several MeVs; and on the other hand, by interacting with plasma mirrors, generate high order harmonics which are associated to bright attosecond pulses in the time domain. Despite the technological prowess in these experiments, the properties of the XUV and electron beams thus generated remain scarcely compatible with the main applications downstream. Following up on previous works in Salle Noire 2, the objective of this thesis was to obtain beams with stable properties, which was achieved by making the laser system more stable and reliable, as well as implementing a fast carrier-envelope phase control loop. By varying the carrier-envelope phase of the laser pulses, we could generate XUV continua/isolated attosecond pulses by forming a relativistic-intensity temporal gate at the surface of the plasma mirror, and also produce electron beams exhibiting stable energy and angle of emission, by controlling the electron injection within the plasma accelerator. Additionally, different regimes of interaction with plasma mirrors were experimentally investigated, such as wakefield acceleration of electrons in long plasma density gradients, and the acceleration of protons on the target’s front side (onto which the laser impinges) along the target no rmal direction, in order to measure new observables (electron energy spectra, proton beam divergence) and thus gain deeper insights into the laser-plasma dynamics
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.
Pełny tekst źródłaTarbox, Grayson J. "Simulations of Electron Trajectories in an Intense Laser Focus for Photon Scattering Experiments". BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5828.
Pełny tekst źródłaChopineau, Ludovic. "Physique attoseconde relativiste sur miroirs plasmas". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS132/document.
Pełny tekst źródłaWhen an ultra-intense femtosecond laser beam [Iʟ > 10¹⁶ W/cm²] is focused on a solid target, the surface becomes completely ionized during the first optical cycles of the laser pulse. Due to their solid-like density and to their limited expansion into the vacuum such plasmas specularly reflect these pulses, just like ordinary mirrors do for low intensity. These plasmas are now used in many scientific applications like particle acceleration by laser light as well as high-order harmonic generation, associated to a train of attosecond pulses in the time domain. Nevertheless, to favor these emissions of light or particle, the energy transfert between the incident field and the dense plasma is crucial. The aim of this thesis is to better understand these interactions through the characterization of high-order harmonics and relativistic electron beams generated on plasma mirrors. We reported in this manuscript the first detailed experimental and numerical study of the coupling mechanisms involved between an ultra-intense laser light [Iʟ > 10¹⁸ W/cm²] and a dense plasma, and more specifically as a function of the gradient scale length Lg. These results enabled to identify two different regimes, clarifying some physical issues. Furthermore, beyond these fondamental aspects, the control of these sources is essential, particularly for futures pump-probe experiments or new spectroscopies. For that, several approaches have been studied to temporally and spatially shape these ultra-short light pulses, thus opening up new perspectives for these sources. We demonstrate in particular the generation of intense XUV vortex beam either by spatially shaping the incident IR field or the dense plasma created at the target surface as well as controlling the electron dynamics on the attosecond time scale with relativistic two-color waveforms. Finally, an innovative method based on in-situ ptychographic measurements has been developed to simultaneously characterize in time and space these ultrashort XUV light pulses, constituting one of the major challenges of the community
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.
Pełny tekst źródłaWhen focusing an ultra-intense femtosecond laser pulse [I>10¹⁶W/cm²] onto a solid target, this target is ionized at the very beginning of the laser pulse. The resulting dense plasma then reflects the laser in the specular direction: it is a plasma mirror. The ultra-intense laser field can accelerate electrons within the plasma at relativistic speeds. Some are ejected towards the vacuum and these plasma mirrors are therefore sources of relativistic electron beams. Moreover, at each optical cycle they radiate in the form of extreme ultraviolet light, resulting in the generation of high-order harmonics of the laser frequency (HHG). The objective of this PhD is to understand laser-plasma interaction though the characterization of high-order harmonics and relativistic electron beams generated from plasma mirrors. The first part deals with harmonic beam measurement. Due to the extreme physical conditions during the interaction, detection can only be performed at macroscopic distance from target. Thus, the characterization of the harmonic beams’ angular properties (carried out as a function of interaction conditions in previous works) only provides partial information on the interaction itself. A technique of coherent diffraction imaging, named ptychography, which consists of diffracting a probe onto an object, is transposed to HHG on plasma mirrors by optically micro-structuring the plasma on a target surface. Harmonic fields are then reconstructed spatially in amplitude and phase directly in the target plane. Thanks to this measurement in different interaction conditions, previously developed theoretical analytical models in non-relativistic regime [I<10¹⁸W/cm²] and relativistic regime [I>10¹⁸W/cm²] are experimentally validated. The second part of the PhD is dedicated to the experimental characterization of angular and spectral properties of relativistic electron beams. A theoretical and numerical study shows that this constitutes the first clear observation of vacuum laser acceleration (VLA). Finally, a simultaneous study of harmonic and electron signals highlights a strong correlation between both processes in the relativistic regime
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.
Pełny tekst źródłaKang, Nai-Hau, i 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.
Pełny tekst źródłaRUIJTER, MARCEL. "Radiation effects for the next generation of synchrotron radiation facilities". Doctoral thesis, 2022. http://hdl.handle.net/11573/1636547.
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