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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 96 for “"Plasma density"”.
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Applications of plasma density measurements to spacecraft radio tracking
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1980.
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Two-Color Heterodyne Interferometry for PI3 Line-Averaged Plasma Density Measurements
… interferometry, which is a technique used for plasma density diagnostics in fusion experiments. Funded through a Mitacs Accelerate internship, this work focused on improving vibration compensation of the existing multi-chord interferometer used at General Fusion for line averaged plasma density …
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Equatorial F -Region Plasma Density Estimation With Incoherent Scatter Radar Using a Transverse -Mode Differential -Phase Method
The full correlation method is formulated and applied to the June 2002 data. Compared to the differential-phase method, this method is different in the sense that it utilizes the real and imaginary parts of the cross-correlation of orthogonal antenna outputs at the high altitudes where SNR is low …
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Dispersion Effects in a High Gain 3.39 Microns Helium - Neon Laser: Application to the Laser Heterodyne Measurement of Plasma Density
Made available in DSpace on 2014-12-08T22:24:28Z (GMT). No. of bitstreams: 1 6901385.pdf: 2497381 bytes, checksum: 3e4ae121c3a23a3d72679112406cd5a7 (MD5) Previous issue date: 1968
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A forward model for ionospheric soundings and its use with incoherent scatter radar data to obtain ionospheric plasma density profiles
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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A forward model for ionospheric soundings and its use with incoherent scatter radar data to obtain ionospheric plasma density profiles
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Multifrequency Scintillation in the Polar Caps
<p>In the ionosphere, plasma density structures with scales sizes ranging from a few centimeters to hundreds of kilometers are capable of modifying the phase and amplitude of a radio signal in a rapid random manner in a process called scintillation. The Coherent Electromagnetic Radio Tomography …
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Investigation of asymmetric plasma blob dynamics
… at MIT. Blobs are local regions of enhanced plasma density. Blobs are relevant to several areas of physics research, including fusion experiments. Understanding blob dynamics is important because blobs affect plasma confinement, a key issue for fusion experiments. The blobs in this experiment …
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Characterization of low-frequency density fluctuations in dipole-confined laboratory plasmas
Low-frequency fluctuations of plasma density, floating potential, ion saturation current, visible light intensity, and edge magnetic field are routinely observed in the Levitated Dipole Experiment (LDX). For the purposes of this thesis, we define low-frequency as W << Wbe where Wbe is the electron …
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Planar Ion Probe for Low-Latitude Ionosphere/Thermosphere Enhancements in Density Cubesat Mission
… any space weather event is absolute plasma density and plasma density fluctuations, both spatially and temporally. Langmuir probes are the oldest and most proven instruments for these in-situ measurements. This thesis enumerates the development of a miniaturized low-noise Langmuir …
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Excitation of forced ion acoustic waves, large plasma sheets, and magnetic field fluctuations over Gakona, Alaska
… waves", and (2) "simultaneous excitation of plasma density fluctuations and geomagnetic field fluctuations" are reported in my M.S. thesis. The data was acquired in our experiments conducted at Gakona, Alaska from summer 2007 to winter 2008, using DoD/NSF-funded HAARP facilities and our own …
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On mechanisms of laser-coupling to fast electrons in ultraintense laser-solid interactions
… 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 magnetic fields. Proposed applications for such interactions include their …
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Computational Studies of Ohmic Heating in the Spheromak
… of the ohmic heating of a spheromak plasma. The plasma density and composition, the applied magnetic field strength, the plasma size, and the plasma current density profile are considered for their effects on the spheromak heating rate and maximum achievable temperature. The …
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Numerical Simulation of Ion-Cyclotron Turbulence Generated by Artificial Plasma Cloud Release
Possibilities of generating plasma turbulence to provide control of space weather processes have been of particular interest in recent years. Such turbulence can be created by chemical released into a magnetized background plasma. The released plasma clouds are heavy ions which have ring velocity …
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Applications of noise theory to plasma fluctuations
… to many physical systems, such as the fusion plasma. Noise theory is used to study the time and space correlations of stationary Markovian fluctuations that are statistically homogeneous and isotropic. The relaxation of the fluctuations is modeled by the diffusion equation. The spatial …
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Diagnostics and modelling of an inductively coupled RF low-pressure low-temperature plasma
… mtorr), low electron temperature (1-10 eV), high density (10<sup>17</sup>-10<sup>18</sup>m<sup>3</sup> ) inductively coupled plasma. This type of plasma is similar to those much used in plasma etching, deposition, and other plasma aided materials processing of devices [I-5]. A two-dimensional, …
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Investigation of plasma potential enhancement in the scrape-off layer of ion cyclotron range of frequencies heated discharges on Alcator C-Mod
… with enhanced sputtering of molybdenum plasma facing surfaces and increased levels of core impurity contents, which subsequently degrade the core plasma performance. RF sheath rectification on open magnetic field lines that intercept material surfaces is currently suspected of causing an …
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Nested Well Plasma Traps
Criteria for the confinement of plasmas consisting of a positive and negative component in Penning type traps with nested electric potential wells are presented. Computational techniques for the self-consistent calculation of potential and plasma density distributions are developed. Analyses are …
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Methods for Testing Transport Theories
… in magnetic fields, electric fields, and plasma density and/or temperature gradient. Although many theoretical models have been introduced to describe anomalous transport mechanisms, none of the proposed models, alone, provides a satisfying description of the experimental data. In recent …
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Intense pulsed neutron generation based on the principle of Plasma Immersion Ion Implantation (PI3) technique
… neutron generator based on the principle of the Plasma Immersion Ion Implantation (PI3) technique is presented, in terms of investigating development of a compact system to generate an ultra short burst of mono-energetic neutrons (of order 1010 per second) during a short period of time (< 20μs) …
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