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 “"Plasma Instability"”.
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Spectral studies of small-scale auroral structure and plasma instability in the high-latitude ionosphere
… these radar enhancements result from natural plasma instability, causing the generation of ion-acoustic waves through the decay of unstable Langmuir waves, themselves driven by low-energy electron streams. Using multi-spectral imaging in combination with radar observations, a direct link is …
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A MODEL OF THE BEAM-PLASMA DISCHARGE
The beam-plasma instability is one of the most basic and general situations in plasma physics. Under suitable conditions, it gives rise to strong electrostatic waves, which interact with the plasma electrons and ions. If the neutral density is high enough, a charge is ignited, the Beam-Plasma …
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Harmonic generation and parametric excitation in a beam-plasma system
… interactions and parametric excitation of plasma and ion-acoustic waves by a beam-plasma instability are studied, theoretically and experimentally, in a cold beam-plasma system. The dispersion relations for plasma and ion-acoustic waves are calculated. Coupling constants for harmonic …
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SAMPLE INTRODUCTION AND INSTRUMENTATION IN PLASMA SPECTROMETRY
Plasma spectrometry is now a widely accepted technique for the determination of the elemental composition of a wide range of sample types. The successful introduction of volatile organic solvents has however been limited, due to the resulting high solvent loading of the plasma and subsequent plasma …
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Inertial tearing modes in magnetically-confined plasmas
In this thesis, I analyzed the behavior of the plasma instability known as the tearing mode in parameter regimes relevant to magnetically-confined fusion plasmas. This included a derivation of the relevant equations and a method of solving them using Fourier analysis. This method allowed the …
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Theoretical and Numerical Studies of Frequency Up-shifted Ionospheric Stimulated Radiation
… involving the electromagnetic and electrostatic plasma waves in the altitude region where the pump wave frequency is near the upper hybrid resonance frequency. The most prominent upshifted feature in the SEE spectrum is the broad upshifted maximum (BUM). In this study, the instability processes …
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Plasma turbulence in the equatorial electrojet observations, theories, models, and simulations
The plasma turbulence in the equatorial electrojet due to the presence of two different plasma instability mechanisms has been observed and studied for more than seven decades. The sharp density-gradient and large conductivity give rise to gradient-drift and Farley-Buneman instabilities, …
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The Mid-Latitude Ionosphere: Modeling and Analysis of Plasma Wave Irregularities and the Potential Impact on GPS Signals
… feature in the mid-latitude ionosphere near the plasmapause, the drift mode growth rate at short wavelengths may explain the mid-latitude decameter-scale ionospheric irregularities observed by the Super Dual Auroral Radar Network (SuperDARN). In the context of this dissertation, we focus on …
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Analysis of Plasma Wave Irregularities Generated during Active Experiments in Near-Earth Space Environment
This work focuses on the analysis of plasma irregularities generated during two active space experiments: the injection of an artificial dust layer, and high-power radio waves. The objective of the "first experiment is to examine the effects of artificially created dust layers on the scatter of …
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Modeling of Polar Cap Ionospheric Patches and Attendant Plasma Instabilities: Initialization from Data and Parametric Analysis
… history of theoretical work on ionospheric plasma patches and their attendant plasma fluid irregularities, particularly within the polar cap region. Within this region though, plasma theory does not always yield tractable problems with succinct analytic solutions that are conceptually …
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Analysis of wave-particle interactions in a beam plasma system
Submitted by Megan O'Donnell (mnodonn2@illinois.edu) on 2012-04-19T21:35:39Z No. of bitstreams: 1 1974_winske.pdf: 5484975 bytes, checksum: 7a34a5388d0ccccc4a5eb68ad137fc0e (MD5)
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Studio sperimentale di plasmi ECR in regimi stazionari e turbolenti mediante un sistema multidiagnostico: prospettive per investigare i decadimenti beta di interesse nucleare e astrofisico in plasma
… termodinamiche dell'ambiente, ovvero un plasma magnetizzato (riscaldato tramite Electron Cyclotron Resonance (ECR)) confinato da intensi campi magnetici. Le attività sperimentali, condotte presso i INFN-LNS e in collaborazione con i Laboratori ATOMKI, riguardano in particolare lo studio, …