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 20 of 23 for “"ion acceleration"”.
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Novel approach to laser-driven multi-stage ion acceleration
All-optical approaches to particle acceleration are currently attracting a significant research effort internationally. Key to the interest in a laser based particle accelerator lies in its cost effective and compactness. However, the ion beams accelerated by the laser-driven mechanisms have …
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Schemes of ion acceleration employing high energy, petawatt laser pulses
… reports on experimental and numerical investigations of ion acceleration employing high energy, picosecond laser pulses. In two separate campaigns on the petawatt arm of the Vulcan laser system, novel laser and target parameters were implemented to explore schemes of ion acceleration beyond the …
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Multispecies ion acceleration from intense laser interactions with thin foils
The understanding and demonstration of novel laser driven ion acceleration mechanisms is key to overcoming the limitations of both well understood laser based processes and becoming competitive with conventional particle accelerators. This thesis presents two methods of enhancing the ion energies …
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Intra-pulse dynamics of laser-driven ion acceleration in ultra-thin foils
… reports on experimental and numerical investigations of ion acceler-ation driven by the interaction of short, intense laser pulses with ultra-thin, solid targets in which relativistic transparency is induced. In particular, it explores the multiple laser-ion acceleration mechanisms that take …
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Early Dynamics of Ultracold Neutral Plasmas
… the nanosecond time scale. We determine the rms ion velocity during the initial plasma period. The initial ion acceleration is found as the time derivative of the ion velocity. We compare to a theoretical model. The experimental results agree with the model at low plasma densities. However, the …
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Design and realization of a beam transport line for handling and selecting laser-driven ion beams for multidisciplinary applications
… reasons for this are huge costs for construction, installation and maintenance associated with complex accelerators (mostly cyclotrons and synchrotrons, and, in general, technical complexity of the facility management and the fact that other radiation therapies have a longer history of use. …
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Optimization of surface dielectric barrier discharge ion sources for electroaerodynamic propulsion
… discharge (DBD) that can be used to generate ions and produce aerodynamic forces in air. They have been studied for aerodynamic flow control and proposed for small aircraft propulsion as both direct sources of thrust and as ion sources for "decoupled" electroaerodynamic (EAD) propulsion, in …
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Radio-Frequency Plasma Expansion in Different Magnetic Nozzle Configurations
… effects of magnetic field strength and orientation on plasma expansion and ion acceleration when the location of plasma excitation is decoupled from the magnetic nozzle (MN) throat with the aim to improve the efficiency of radio-frequency plasma thrusters and explore the feasibility of magnetic …
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Propulsion mechanisms in a helicon plasma thruster
Electric thrusters offer an attractive option for various in-space propulsion tasks due to their high thrust efficiencies. The performance characteristics of a compact electric thruster utilizing a helicon plasma source is investigated with the goal of identifying potential thrust mechanisms. …
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TOF-based diagnostics system development and Geant4 simulation of the ELIMED transport and dosimetry beam line for high energy laser-driven ion beam applications @ ELI Beamlines
The acceleration processes based on the coherent interaction of high-power laser with matter is by now one of the most interesting topics in the field of particle acceleration, becoming a real alternative to conventional approaches. Some of the peculiarities of laser accelerated ion beams, if well …
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Collective charged particle dynamics in relativistically transparent laser-plasma interactions
… reports on experimental and numerical investigations of the collective response of electrons and ions to the interaction of ultra-intense (10²⁰ Wcm⁻²) laser with ultra-thin (nanometre scale) foils undergoing expansion and relativistic induced transparency. The onset of this relativistic mechanism …
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Finite Ion Temperature, Plasma Rotation, and Electromagnetic Effects on Plasma Acceleration in the Magnetic Mirror Geometry
Converging-diverging magnetic field configurations (such as magnetic mirrors and mag-netic nozzles) are employed in various functions for nuclear fusion, electric propulsion, and material processing applications. The physics underlying the dynamics of plasmas in such geometries is not fully …
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Selective Deuteron Acceleration using Target Normal Sheath Acceleration
… accelerated to multi-MeV energies after irradiation with an ultra-intense laser. The versatility of an ion beam for the generation of neutrons can be improved by tailoring which ions are accelerated. Nominally, the dominant species accelerated is the lightest present on a target surface typically …
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The role of near time coherent contrast on ultrafast laser driven radiation sources
… at RAL and the JETI 40 laser in Jena. Simulations using EPOCH are also presented. The overall theme is the effect of near time, femtosecond - tens of picoseconds, contrast on different mechanisms produced by laser - plasma interaction.<br/><br/>The Gemini experiment is one which examines the …
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Diagnostics of solar flare energetic particles: neglected hard X-ray processes and neutron astronomy in the inner heliosphere
For work on my thesis dissertation, we have been studying some energetic processes in solar flares. On our work on hard X-ray (HXR) emission from flares, we have shown that non-thermal recombination emission can compare with the bremsstrahlung HXR flux for certain flare conditions. In this thesis, …
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On mechanisms of laser-coupling to fast electrons in ultraintense laser-solid interactions
This thesis reports on experimental investigations of the interaction of intense (> 10¹⁸ W/cm²) laser pulses with solid density targets. This interaction has been known for many years to generate high energy (fast) electrons, ions, xrays and γ-rays as well as powerful shock waves and gigagauss …
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Self-generated magnetic fields in intense laser-solid interactions relevant to relativistic plasma astrophysics
… magnetic fields in ultra-intense laser interactions with dense plasma and the role that these play in the dynamics of relativistic electrons, and, subsequently, ion acceleration. This includes an investigation of resistive magnetic fields generated within solids and their influence on the …
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Ion dosimetry for radiobiology experiments employing laser-accelerated beams
… environments, characteristic of laser driven ion acceleration, is a largely unexplored field of research, the understanding of which is crucial to the development of an all-optical delivery of ion beams suitable for cancer treatment. In conducting cell experiments to investigate this …
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Advances in electroaerodynamic thrusters for aircraft propulsion
An electroaerodynamic (EAD) thruster is a propulsion system for small aircraft that is mechanically simple, has no moving parts, and is nearly silent. EAD thrusters produce ions from atmospheric air and accelerate the ions across two electrodes separated by an air gap: collisions of ions with …
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Impacts of Anisotropy, Wave Heating, and Neutral Winds on High-Latitude Ionospheric Dynamics
<p>Significant amounts of ionospheric plasma can be transported to high altitudes (ion upflow) in response to a variety of plasma heating and uplifting processes such as DC electric fields and precipitation. Once ions have been lifted to high altitudes, transverse ion acceleration by broadband ELF …
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