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 22 for “"Plasma temperature"”.
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Analysis of a laser induced plasma in high pressure SF6 gas for high-voltage, high-current switching
… propagation is used to analyze a laser induced plasma spark in SF6 gas in order to quantify parameters such as spark length and plasma temperature. The laser spark is created through a focusing lens by the fourth-harmonic (266nm) of a 5ns FWHM pulsed Nd:YAG laser with 30mJ maximum energy output. …
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Ultrashort laser pulse-matter interaction: Fundamentals and early stage plasma dynamics
… in this study. The model comprises a two-temperature model and a hydrodynamic model supplemented with a quotidian equation of state model, considering the relevant multiphysical phenomena during the laser-matter interaction. The models are capable of simulating the ablation process and the …
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Fundamental study of magnetic field-assisted micro-EDM for non-magnetic materials
… problem, one aimed at altering the discharge plasma channel through the use of magnetic fields to affect plasma confinement and/or plasma stability and the other aimed to improve the material removal mechanism of the µ-EDM process through the use of Lorentz forces induced in the melt pool. …
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Low frequency plasma waves at Mars
… eight years of observations of low frequency plasma waves produced in the interaction of the solar wind with the Martian ionosphere. Using the MAG/ER data, I identify the properties and physical origins of the waves in the magnetosheath, magnetic pileup region, and ionosphere. I find that the …
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Multi-Tokamak Assessment of Modeled Temperature Profiles
… Integrated Modeling Group by comparing simulated plasma temperature profiles with experimental data from three well-documented tokamak discharges: Holland (2011) [1], White (2014) [2], and Zagorski (2015) [3]. The validation study uses the iterative TRANSP and PORTALS transport solvers to achieve …
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Particle-In-cell simulations of nonlocal and nonlinear effects in inductively coupled plasmas
The kinetic effects in an inductively coupled plasma (ICP) due to thermal motion of particles modified by self-consistent magnetic fields are studied by using a particle-in-cell (PIC) simulation. In the low pressure, low frequency regime, electron mean free paths are large relative to device size …
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Analyzing geological materials under martian conditions using laser-induced breakdown spectroscopy : plasma fundamentals, sample classification, and trace element quanitification
… explores aspects of the fundamentals of LIBS plasma temperature as a function of distance, sample classification based on a spectral matching technique called Partial Least Square-Discriminant Analysis, and the quantification of several trace elements (Li, Rb, Sr, and Rb) using ChemCam …
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Design and Characterization of a Theta Pinch Discharge for Atomic Emission Spectroscopy
The high temperature and density plasma generated by magnetic constriction of a preexisting plasma was studied as an emission source for the elemental analysis of solid materials. This high energy plasma has the ability to directly sample solid materials. A theta pinch discharge was designed and …
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Machine Learning and Deep Learning applications for the protection of nuclear fusion devices
… of “disruptions”, and sudden terminations of plasma confinement. For the development and testing of machine learning classifiers, a total of 198 disrupted discharges and 219 regularly terminated discharges from JET. Convolutional Neural Networks (CNNs) were proposed to extract the …
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Vertical compact torus injection into the STOR-M Tokamak
… goal due to premature ionization caused by high plasma temperature and density. Fuelling by injecting a compact torus (CT) may be the only viable method suitable for a reactor-grade tokamak. CTs can be injected at different angles with respect to the tokamak toroidal magnetic field, either …
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The Nature and Origin of Large Scale Diffuse X -Ray Emission in the Large Magellanic Cloud
… (≥4 Mpc) galaxies. X-ray spectra show the plasma temperature of the hot gas interior to LMC2 to be kT ∼ 0.1--0.7 keV. The derived electron densities for the hot gas inside LMC2 is higher than the electron densities for other supergiant shells in the LMC, but are comparable to or lower …
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Meta-analysis of Tokamak reactor designs
… class has longer confinement times, higher plasma current, and lower magnetic field while the latter class tends to have lower gain, higher power per surface area, higher power per volume, and much smaller stored magnetic energies. Between the two sets, the non-dimensional plasma physics …
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The role of nanostructured targets in Laser-Produced Plasmas for Nuclear Astrophysics studies
… PhD thesis documents the experimental study of plasmas produced from the interaction of a high-power laser in ns domain with nanostructured materials compared with ordinary bulk target. The study is focused on the effect of solid targets with different physical and geometric characteristics, and …
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Multi-physics modeling of plasma discharge and material removal in micro electro-discharge machining process
… understand formation and expansion of micro-EDM plasma, and the process of formation of melt-pool and material removal at the workpiece. Initially, a model of micro-EDM plasma has been developed using a ’Global Model’ approach in which the plasma is assumed to be spatially uniform, and equations …
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Impurity transport studies on MAST
… is a subject of fundamental importance in plasma physics in general and in tokamak physics in particular. The behaviour of the various impurity species and the evolution of their concentration determines, among other things, the fuel dilution and the fusion reaction rate, the plasma …
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Broad-band spectral analysis of a complete sample of type 1 AGN detected by INTEGRAL
… we found that the average Comptonising plasma temperature is typically ?50 keV with an optical depth ranging from 2 to 5, i.e. the plasma is not too thick. As far as the Cosmic X-ray Diffuse Background is concerned, synthesis models have so far assumed a spectral shape for the CXB with …
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Multiphysics Model of Hypervelocity Impact and Impact Induced Plasma Formation
… target. While several experiments have observed plasma formation and associated electromagnetic (EM) emissions, key questions remain unresolved — including the source of ionization (projectile, target, or ambient medium), the plasma composition, and the spectral radiance of emitted EM waves. …
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Dynamic interactions between energetic D and He ions on lithium-tungsten plasma-facing interfaces
… and enabling confinement of highly-dense high-temperature fusion plasmas, a considerably higher demand is placed on the plasma facing components (PFCs) with an increase of fusion power production. Currently within operating experimental reactors, the PFCs need to handle only a few MW/m$^2$ of …
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A study on the ion temperature gradient driven turbulence in tokamak plasmas
… breakthrough result. Nuclear fusion can occur at temperatures of the order of 150 million degrees Celsius (thermonuclear fusion). At these temperatures atoms are completely ionized, the fuel is then in the state of matter called a plasma, a gas of ions and electrons. The most promising approach …
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Experimental and computational magnetic surface mapping of the HIDRA stellarator
… previously run by the Max-Planck-Institut für Plasmaphysic in Greifswald under the name WEGA. Even with its much lower plasma temperature and density when compared to bigger machines such as EAST and W7-X, HIDRA can be used to conduct plasma-material interaction experiments. Its particle and …
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