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 13 of 13 for “"FAST ELECTRONS"”.
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On mechanisms of laser-coupling to fast electrons in ultraintense laser-solid interactions
… known for many years to generate high energy (fast) electrons, ions, xrays and γ-rays as well as powerful shock waves and gigagauss magnetic fields. Proposed applications for such interactions include their implementation as a compact source of high energy ions to be used in the treatment of …
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Measurements and modeling of Lower Hybrid Driven fast electrons on Alcator C-Mod
… The primary diagnostic for measuring LH-driven fast electrons is a hard x-ray (HXR) camera that measures fast electron Bremsstrahlung emission. This is a horizontallyviewing diagnostic with 32 spatial chords that span the plasma cross-section. Each chord ends at a cadmium zinc telluride (CZT) …
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Characterization of short-pulse laser-produced fast electrons by 3D hybrid particle-in-cell modeling of angularly resolved bremsstrahlung
… a solid target efficiently generates energetic (fast) electrons above the energy of 1 Mega-electronvolt (MeV). Characterization of such high-energy electrons is critical for numerous applications, such as the generation of secondary particle sources, the creation of warm dense matter (WDM), …
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Lower hybrid modeling and experiments on Alcator C-Mod
… results obtained on ASDEX. The location of the fast electron population is critical in diagnosing the performance of the lower hybrid system and can be inferred by measuring nonthermal bremsstrahlung emission. A state-of-the-art diagnostic for hard x-ray (HXR) emission was designed and used to …
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generation and transport of high-current relativistic electron beams in high intensity laser-solid interactions
… investigated experimentally and numerically. The fast electron beam is experimentally diagnosed by means of a 2D Cu Kα 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 …
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X-ray diagnostics for the Levitated Dipole Experiment
… most of the plasma energy will be stored in the fast electrons, Te > 100 keV. As a consequence, x-ray flux from bremsstrahlung emission is expected to be easily detectable. The energy spectrum of the x-ray emission below 740 keV is measured by a four channel pulse height analyzer using cadmium …
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Heating of solid matter via laser generated electrons
… the heating of solid targets via laser generated fast electron beams, which allows for better understanding and optimisation of the generation of hot dense matter in a laboratory setting. The work is split into 3 main investigations which are summarised below. In the first investigation, simple …
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Numerical simulations of radiation and heating from non-thermal electrons in solar flares
… as a result of the propagation of a beam of fast electrons moving through the ambient coronal plasma. Chapter 1 presents an overview of the Sun and the magnetic processes at work in the solar atmosphere. It also contains a summary of observations and current work corresponding to the …
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Microwave Triggered Laser Ionization of Air
… from the wave to the plasma and generation of fast electrons, is presented. A discussion on the effects of various unmagnetized plasma parameters on the transmitted, absorbed, and reflected power is presented.
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Effects of electrical resistivity on fast electron transport in relativistic laser-solid interactions
… the effect of electrical resistivity on fast electron transport is explored. The first investigation explores fast electron transport in allotropes of carbon by measuring the spatial-intensity distribution of the beam of protons accelerated from the target rear-surface. An analytical …
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Monte Carlo simulation of the radiolysis of water by fast neutrons at elevated temperatures up to 350°C
… since it is known as representative of a fast neutron flux in a nuclear reactor. For light water, for that chosen energy, the most significant contribution to the radiolysis comes from the first four neutron collisions that generate mostly ejected protons with energies of ~1.264, 0.465, …
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Quantification of lower hybrid wave absorption in the edge of the Alcator C-Mod Tokamak
… diverted discharge to determine the edge loss of fast electrons. The high strike point could be observed using the hard X-ray camera, which can compare core and edge X-ray emission. The measured count rates from thick-target bremsstrahlung were interpreted into fast electron fluxes using the Win …
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Diagnosis of the flux emanating from the intermediate focus of an extreme ultraviolet light lithography source
… plasmas: one initiated by the high energy electrons decoupled from the plasma core, one caused by the energy retarded fast electrons coupled with the expansion of the high energy ions, as well as the expansion of the lower energy core of the EUV emitting plasma into the surrounding buffer …