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Showing 1 to 20 of 97 for “"plasma parameters"”.
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Measurment of Process Plasma Parameters in a RF Capacitively Coupled Device
Made available in DSpace on 2017-07-06T18:59:27Z (GMT). No. of bitstreams: 3 Wilson_Jeffrey_L_MS.pdf: 81564240 bytes, checksum: bb11bb53dd8ef093afd430fddc29e9b1 (MD5) Wilson_Jeffrey_L_MS_ABS.pdf: 559103 bytes, checksum: 94f9ef64e77d3e783f5f215f4541bba4 (MD5) license.txt: 4813 bytes, checksum: …
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Consequences of Mode Structure on Plasma Parameters in Electron Cyclotron Resonance Sources used for Materials Processing
Made available in DSpace on 2017-07-06T18:49:02Z (GMT). No. of bitstreams: 3 Kinder_Ronald_L_MS.pdf: 55983630 bytes, checksum: 14b73a0c7b164993c74cc15004434846 (MD5) Kinder_Ronald_L_MS_ABS.pdf: 637320 bytes, checksum: c1708001642b4606ece902c468dd5af2 (MD5) license.txt: 4813 bytes, checksum: …
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Probes in gaseous plasmas
… gas have been used for the quantitative study of plasmas. The plasma parameters of interest are electron and ion temperature, electron and ion concentration, and plasma potential.
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Fusion-Product Energy Loss in Inertial Confinement Fusion Plasmas With Applications to Target Burns
… because of the limited knowledge of high-density plasmas. One area of uncertainty is the energy-loss rate of fusion products. This is due in part to the unique plasma parameters encountered in these plasmas compressed to more than one-thousand times solid density. The work presented here …
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Local transport analysis for the Alcator C-Mod tokamak
… with P*, the ion Larmor radius normalized to the plasma size. The second was a comparison of the transport predictions from the IFS-PPPL model of ion temperature gradient (ITG) driven turbulence to observations on C-Mod. The P* scaling experiments on C-Mod extend the range of plasma parameters …
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Disruption prediction at JET [Joint European Torus]
The sudden loss of the plasma magnetic confinement, known as disruption, is one of the major issue in a nuclear fusion machine as JET (Joint European Torus), Disruptions pose very serious problems to the safety of the machine. The energy stored in the plasma is released to the machine structure in …
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Development of an uncompensated diagnostic for the measurement of phase-resolved characteristics in radio-frequency plasmas
In recent years, plasma technology has found its way into a wide and diveme array of manufacturing techniques and facilities, ranging from biomedical applications to microprocessor fabrication. In all cases, greater overall efficiency and usefulness can be improved by understanding the fundamentals …
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Characterization of a turbulence bifurcation underlying L-mode confinement transitions on Alcator C-Mod
… discontinuous changes in scaling behavior as the plasma parameters are varied, termed confinement transitions. Navigating these transitions requires an understanding of the physical origin and limits of confinement scalings, and is crucial for retiring the physics risk of extrapolating empirical …
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Characterization of Microwave Cavity Discharges in a Supersonic Flow
… partially ionized gas is referred to as either a plasma or a discharge depending on the degree of ionization. The term discharge is usually applied to a weakly ionized gas, i.e. mostly neutrals, where as a plasma usually has a larger degree of ionization. To characterize a discharge the plasma …
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Effects of RF power on SOL density profiles and RF coupling on the Alcator C-Mod tokamak
… (SOL) density profiles under a wide range of plasma parameters in order to study plasma-antenna coupling and non-linear RF-SOL interactions on Alcator C-Mod. After validating the reflectometer density profiles with other density profile diagnostics in easily diagnosed and well understood …
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Characterization of a Low Current LaB6 Heaterless Hollow Cathode with Krypton Propellant
… the only diagnostic tool used experimentally. A plasma model is used to infer plasma parameters in the cathode emitter region. The cathode characterization results are consistent with those obtained during previous investigations of 1 A-class LaB6 hollow cathode with krypton. A peak-to-peak anode …
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Propulsion mechanisms in a helicon plasma thruster
… a compact electric thruster utilizing a helicon plasma source is investigated with the goal of identifying potential thrust mechanisms. Performance characteristics such as thrust, specific impulse, ion cost and thrust efficiency are discussed and related to plasma parameters. The design and …
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Two-fluid simulations of magnetic reconnection with a kinetic closure for the electron pressure anisotropy
… rearrangement of magnetic line topology in a plasma that can allow magnetic energy to heat, drive macroscopic flows, or accelerate particles in space and laboratory plasmas. Though reconnection affects global plasma dynamics, it depends intimately on small-scale electron physics. In …
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Experimental and computational studies of electric thruster plasma radiation emission
… in thruster operations as well as diagnosing the plasma parameters. This study presents the spectral measurement results of three different electric thrusters and plasma sources. First, the BHT-200 Hall thruster emission spectra measurements are presented for varying discharge voltage and for …
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Modeling the influence of ion wakes on the self-organization of dust in a complex plasma.
… between charged dust grains and streaming plasma leads to the formation of ion wakes, which are thought to be responsible for the self-organization of dust into complex structures. These structures have been observed to exhibit long-range stability both in ground-based and microgravity …
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Whole-device modeling of HIDRA plasmas for experimental planning
… steady-state conditions with a fusion-relevant plasma edge. In order to determine how to run the machine to achieve the desired experimental conditions (density, temperature, and fluxes to the limiters), it is beneficial to have a model to predict these plasma parameters under various operating …
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Characterization of a Magnetically Contained Hot Filament Plasma Source with a Wide-Sweeping Langmuir Probe
<p>Ionospheric plasma research in the Space and Atmospheric Instrumentation Laboratory’s Space Plasma Chamber has been hindered by the lack of a suitable plasma diagnostic instrument and understanding of its hot-filament plasma source. This thesis describes efforts made to remedy both problems. A …
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Efekt konzumace jednoduchých cukrů na kognitivní funkce potkaních samic
… the chronic consumption of sugars in humans. Plasma parameters and expression of proteins, involved in metabolic pathways, were determined in the frontal cortex. Cognitive functions were evaluated through the novel object recognition (NOR) and Morris Water Maze (MWM) tests. Results, obtained …
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ΕΝΑΠΟΘΕΣΗ ΑΜΟΡΦΟΥ ΥΔΡΟΝΩΜΕΝΟΥ ΠΥΡΙΤΙΟΥ ΣΤΗΝ ΕΚΚΕΝΩΣΗ ΑΙΓΛΗΣ ΤΟΥ ΣΙΛΑΝΙΟΥ. ΡΟΛΟΣΤΩΝ ΕΝΕΡΓΩΝ ΕΝΔΙΑΜΕΣΩΝ
IN THIS WORK WE EXAMINE THE PROCESS OF PLASMA ENHANCED CHEMICAL VAPOUR DEPOSITION OF AMORPHOUS HYDROGENATED SILICON FOR HIGH EFFICIENCY SOLAR CELLS. NAMELY, OUR EFFORT IS TO CORRELATE MACROSCOPIC DEPOSITION PARAMETERS WITH MICROSCOPIC PLASMA PARAMETERS AND THE DEPOSITED FILM CHARACTERISTICS. FOR …
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