Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Electron acceleration"”.
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High Energy Laser Driven Electron Acceleration
… out looking into the process of laser wakefield acceleration of electrons, for the possible application to the generation of multi-MeV γ-rays via nonlinear Thomson scattering. The effects of introducing a gas density gradient just after the accelerating gas cell was tested with the intention of …
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Laser-driven electron acceleration in infinite vacuum
… models for laser-plasma interaction that explain electron acceleration and beam confinement in plasma. Next, I discuss ponderomotive electron acceleration in infinite vacuum, showing that the transverse scattering angle of the accelerated electron may be kept small with a proper choice of …
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Optical development of an ion/electron acceleration facility
… thesis details the optical development of an ion/electron accelerating facility at Southwest Research Institute which is currently being used to calibrate the Plasma Spectrometer for the Cassini Mission to Saturn. The optical development involves particle (ion) ray tracing of each element in the …
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All-optical electron acceleration with ultrafast THz pulses
… demonstration of the first ultrafast THz-driven electron gun, a technology with the potential to deliver unprecedented electron beam quality to scientists studying matter at the ultrafast and ultrafast scale via electron diffraction or x-ray imaging. In Part 1, we discuss various advances in …
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Electron acceleration in a flare plasma via coronal circuits
… flare is transferred into the kinetic energy of electrons. However the mechanism that accelerates a large number of electrons to high energies (beyond 20 keV) within fractions of a second is not understood yet. The thesis at hand presents a model for the generation of energetic electrons during …
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Electron acceleration at localized wave structures in the solar corona
… part of this energy is carried by the energetic electrons, considered to be the source of the nonthermal radio and X-ray radiation. One of the most important and still open question in solar physics is how the electrons are accelerated up to high energies within (the observed in the radio …
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Compact laser-driven electron acceleration, bunch compression and coherent nonlinear Thomson scattering
… x-ray source, this thesis studies the linear acceleration of electrons by optical lasers in unbounded vacuum, the linear acceleration and compression of electron bunches by coherent terahertz pulses in cylindrical waveguides, and the generation of coherent hard x-ray radiation by nonlinear …
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Electron acceleration and loss caused by wave-particle interactions in the Van Allen radiation belts
… the inner belt is considered stable, the flux of electrons in the outer belt can vary over several orders of magnitude, reaching levels that may disrupt satellite operations. It is therefore important to understand the variability of the outer belt and ultimately to predict its behaviour. In this …
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Transport Properties and Radiation Production in Plasmas with Sub-Larmor-Scale Magnetic Turbulence
… reside at small, sub-Larmor scales. Efficient electron acceleration to relativistic energies is not uncommon in such environments. Spectra of radiation emitted by these relativistic electrons can deliver a wealth of information about the internal structure of such "Weibel turbulence". The …
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Study of Narrow-Band Spectral Characteristics of Stimulated Electromagnetic Emission (SEE) During Second Electron Gyro-Harmonic Heating
… frequency is near the second harmonic of the electron gyro-frequency. New, more comprehensive, experimental observations of spectral features within 1kHz of the pump wave frequency are reported here in order to begin more careful comparisons of the experimental observations and a possible …
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High-resolution multi-wavelength study of the jet in 3C273
… be explained by a model in which two distinct electron populations contribute to the jet's emission. We fit spatially resolved synchrotron spectra for the jet and determine the run of the maximum particle energy. The decrease of the maximum particle energy along the jet is much slower than …
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Wave-particle interactions in the solar wind and solar flares
… present new numerical results on the stochastic electron acceleration in solar flares by weakly turbulent fast magnetosonic waves ("fast waves"). For this work, we assume that large-scale flows triggered by magnetic reconnection excite large-wavelength fast waves, and that fast-wave energy then …
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Computational study of hot electron generation and energy transport in intense laser produced hot dense matter
… involved in the HED plasma.Laser absorption, hot electron transport, and isochoric heating physics in laser produced hot dense plasmas are studied with the help of PICLS simulations. In particular, a novel mode of electron acceleration, namely DC-ponderomotive acceler- ation, is identified in the …
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Theory of terahertz generation by optical rectification
… long wavelengths, they are uniquely amenable for electron acceleration, coherent X-ray generation and non-linear spectroscopy. Intra-pulse difference frequency generation or optical rectification of ultrafast optical pump pulses in nonlinear crystals has emerged as the most efficient approach for …
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Laser Wakefield Accelerator Simulations Using EPOCH
… provide a cheap, compact and accessible form of electron acceleration. These systems use high intensity laser pulses to drive a large amplitude plasma density wake. This wake is then used to trap and accelerate electrons to high energies. This particle acceleration technique still requires …
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EMP mitigation and novel detection strategies for laser-plasma experiments
… been demonstrated, including x-rays, protons, electrons and positrons. The laser driven production of exotic particles such as muons has been theorised. Proposed applications for some of these novel particle and photon sources include a compact source of ions for cancer treatment, electrons for …
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New-Measurement Techniques to Diagnose Charged Dust and Plasma Layers in the Near-Earth Space Environment Using Ground-Based Ionospheric Heating Facilities
… parameters. The effect of parameters such as the electron temperature enhancement during radiowave heating, dust density, dust charge polarity, ion-neutral collision frequency, electron density and dust radius<br />on the temporal evolution of electron irregularities associated with PMSE is …