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 47 for “"plasma dynamics"”.
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Plasma Dynamics in a High-Power Helicon Source
The magnetically confined plasma in the ITER fusion reactor must reach temperatures over 100 million kelvin to sustain fusion reactions. Neutral Beam Injectors (NBIs) will provide most of the heating power by accelerating negative ions to energies of 1 MeV, where they are then neutralised to …
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Plasma Dynamics in a High-Power Helicon Source
The magnetically confined plasma in the ITER fusion reactor must reach temperatures over 100 million kelvin to sustain fusion reactions. Neutral Beam Injectors (NBIs) will provide most of the heating power by accelerating negative ions to energies of 1 MeV, where they are then neutralised to …
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A Multi-Region Multi-Timescale Burning Plasma Dynamics Model for Tokamaks
… in tokamaks brings forth demands for burning plasma dynamics research. The deuterium-tritium fusion generates energetic alpha particles, which first transfer their energy to core electrons. The heated electrons and remaining fusion alpha particles then heat core ions through Coulomb …
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Ultrashort laser pulse-matter interaction: Fundamentals and early stage plasma dynamics
… the ablation process and the resultant plasma evolution in a wide range of laser intensity, and are valid both in air and in vacuum.^ The developed model is applied to investigate the ablation of metals in various laser intensity ranges. The dependence of ablation rates on laser …
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Studies of non-hydrodynamic processes in ICF implosions on OMEGA and the National Ignition Facility
Ion kinetic effects are expected to modify plasma dynamics when ion mean-free-paths and collision times become comparable to the scale sizes of the plasma. Such conditions arise during the shock convergence phase of inertial confinement fusion (ICF) implosions, when they may modify the compression …
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Study of Multi-Electron Ionization and Charge Exchange in HIBF
… to the study of atomic effects for HIBF, plasma dynamics in a low-energy radio frequency (RF) discharge is studied through the implementation of a new Monte Carlo Collision (MCC) module developed for including into a Particle-In-Cell (PIC) package, The MCC module uses available cross …
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Probe studies of plasma in a magnetic well
… have enabled detailed description of the plasma dynamics in the central horizontal plane to be given. A method developed by Lovberg in which the magnetic measurements are coupled with measurements with a double floating electric probe, was used to measure the electron density in certain …
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Early Dynamics of Ultracold Neutral Plasmas
We report new studies on the early-time dynamics of ultracold neutral plasmas. We use fluorescence spectroscopy to probe plasma dynamics on 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 …
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Evaluation of the theta pinch as a sampling and excitation source for elemental analysis of solid refractory materials
… necessary to gain more information about the plasma dynamics to further optimize discharge parameters for improved sampling. Conclusions are based on measurements of plasma shock wave propagation, argon ion excitation temperature, and plasma sampling efficiency as they relate to alterations in …
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Solar Wind-Magnetosphere-Ionosphere Coupling: Multiscale Study with Computational Models
… computational models that characterize space plasma dynamics on distinct spatial/temporal scales. These models are used to explore three important aspects of SW-M-I coupling. A particle-in-cell (PIC) model has been developed to explore the kinetic scale dynamics associated with the magnetotail …
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Supersonic cooling of short-lived molecular states in a pulsed microcavity plasma jet
… as short as 19 ns have been generated in a micro-plasma jet at super-atmospheric pressure and rotationally cooled by supersonic expansion. Spatial-temporal spectrograms of d^3Σ+u→(b^3)π_g (v', v"") = (0, 0) emission are obtained, which contain the information about the dynamic cooling process …
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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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Catecholamine physiology in the sheep
… carried out with emphasis on the measurement of plasma catecholamine levels and their interactions with lactic acid and cortisol. The plasma dynamics of the catecholamines were first examined under laboratory conditions followed by an assessment of sympathetic responses to a variety of …
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Fully kinetic modeling of a divergent cusped-field thruster
A fully kinetic, particle-in-cell plasma simulation tool has been incrementally developed by members of the Massachusetts Institute of Technology Space Propulsion Laboratory. Adapting this model to simulate the performance and plasma dynamics of a divergent cusped-field thruster is discussed. …
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Finite Ion Temperature, Plasma Rotation, and Electromagnetic Effects on Plasma Acceleration in the Magnetic Mirror Geometry
… applications. The physics underlying the dynamics of plasmas in such geometries is not fully understood and remains an area of active research. The ambipolar ion acceleration by the electric field due to plasma compressibility in the inhomogeneous magnetic field, in some ways, is analogous …
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A plasma-wall interaction model for the erosion of materials under ion bombardment
… evolution and behavior of materials exposed to plasma is critical for the design of future electric propulsion devices. As ions are ejected from the device generating thrust, they also impact the ceramic walls. This induces wall erosion, ultimately exposing the magnetic circuit leading to …
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Theoretical study of direct and indirect single ionisation by electron impact /
… astrophysical processes and thermonuclear plasma dynamics. The direct and indirect ionisation processes of ions are analysed, and the cross sections of the ionisation effect are determined. The correlation effects of Fe3+ and W5+ ions were also investigated and the experimental data of …
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Tiesioginės ir netiesioginės viengubos jonizacijos elektronų smūgiais tyrimas /
… astrophysical processes and thermonuclear plasma dynamics. The direct and indirect ionisation processes of ions are analysed, and the cross sections of the ionisation effect are determined. The correlation effects of Fe3+ and W5+ ions were also investigated and the experimental data of …
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