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.
Results
Showing 1 to 20 of 20 for “"electron temperatures"”.
-
Ion and electron temperatures in the topside ionosphere
Experimental and theoretical ion and electron temperatures in the topside ionosphere are investigated. Experimental results come from an analysis of incoherent-scatter data taken at Arecibo, Puerto Rico. Consideration of the energy balance equations gives the theoretical ion and electron …
-
Design of Optical Measurements for Plasma Actuators for the Validation of Quiescent and Flow Control Simulations
… determine the plasma characteristics relating to electron temperatures and densities. Using optical measurement techniques such as plasma spectroscopy, measured electron temperatures and densities to compare with theoretical calculations of plasma flow control under a variety of flow conditions. …
-
Alcator C-Mod soft X-ray pulse height analysis system
… counting rates of up to 80kHz. The thermal electron temperature is measured from the energy dependence of the intensity of the electron bremsstrahlung spectrum. Measurements of line radiation allows the PHA to identify impurity ions within each plasma shot. The result is a diagnostic that …
-
CHARACTERIZATION OF BCl₃, SF₆, and BCl₃/SF₆ PLASMAS USING LANGMUIR PROBE MEASUREMENTS
… In this study, energy distribution functions, electron temperatures (and average electron energy) and electron, positive ion, and negative ion densities were determined as a function of process conditions such as RF power, chamber pressure, and SF6 percentage in the total flow. With the …
-
Depositing highly crystalline thin film silicon for photovoltaic solar cells utilizing metal surface wave plasmas
… but very few utilizing the MSWP. Due to the high electron densities and low electron temperatures characteristic of MSWPs, it is shown that this type of plasma is an ideal candidate for large area, high speed, low damage thin film deposition. The quantitative methods of examining films created by …
-
Development of 0 – D argon collisional radiative model conjoined with optical emission spectroscopy for radio frequency plasma
… diagnostic technique that can compute electron properties by simulating the chemical network within a plasma system, unlike conventional OES while providing elemental and excitation or ionization levels of gases in plasma. Thus, this project aims to develop a global argon collisional …
-
Physics and application of an atmospheric pressure plasma jet
… data on the plasma parameters including electron densities and electron temperatures. In this work we present the use of Thomson scattering to measure the spatially resolved properties of the electrons in a kHz-driven helium APPJet. Since the jet propagates into air, a key aspect of this …
-
Development and Testing of a Gallium Electromagnetic (GEM) Thruster
… Axial triple Langmuir probe measurements yield electron temperatures in the range of 0.8 - 3.6 eV and electron densities in the range of 8e20 - 2e22 electrons per meter cubed. The plasma expands isentropically with divergence half-angles in the range of 16 - 20 degrees. Spatially resolved …
-
Design of Optical Measurements for Electrothermal Plasma Discharges
… and a Photron FASTCAM SA4 high speed camera. Electron plasma temperatures are estimated using copper peaks in the UV region with the relative line intensity method, and electron plasma density is estimated by measuring the full width at half maximum (FWHM) of the stark broadened H--β line at …
-
Three-dimensional modeling of plasma transport in the HIDRA stellarator
… to two heating schemes tested at WEGA. Electron temperatures and densities were seen to match previous WEGA results of 8-10 eV and 1-3 · 10^12 cm^-3 in the edge region respectively. With these results, 26 kW of operational power translates to heat fluxes of up to 1 MW m^-2 on the inboard …
-
Diagnosis of the flux emanating from the intermediate focus of an extreme ultraviolet light lithography source
… shown that the interaction between high energy electron and photons, energetic ions, and energetic neutrals with the buffer gas has a considerable impact on the creation and transport of non-EUV photon debris to the intermediate focus. The creation of an EUV light emitting plasma results in the …
-
Laser-Emissionsspektrometrie für die Partikelanalyse von Prozessgasen bei der Roheisenerzeugung
… that an increase of the gas pressure affects the electron pressure as well as the electron density due to collison and relaxation processes. Plasma properties are changed which lead to a decrease of line intensity, line broadening and to a decrease of signal-to-backround ratio. Consequently the …
-
Interactions of intense optical and extreme-ultraviolet lasers with atoms and solids
… EUV radiation with atoms, performed at the free-electron laser in Hamburg. When an intense optical laser impinges on a solid metal surface a high density, high temperature plasma is produced. If two such plasmas are produced within close proximity on flat (or wedge-shaped) targets, as they expand …
-
Studies of electron heat conduction in magnetized, shock-driven implosions at OMEGA
… to inertial confinement fusion (ICF). The electron heat conduction, one of the primary hot spot energy losses, is suppressed perpendicular to the external magnetic field, which is expected to increase yields and temperatures in collisional plasmas. However, since the particle and energy …
-
Bayesian analysis of electron cyclotron emission measurements at Wendelstein 7-X
Electron cyclotron emission spectroscopy (ECE) is a standard diagnostic technique on the optimized stellarator Wendelstein 7-X (W7-X) that can record data with a high resolution in time. The spatial assignment via the blackbody emission of a plasma layer depends on the optical depth and thus plasma …
-
Theoretical and Experimental Studies of Radiation from High-Z Multiply Ionized L-shell Ions with Emphasis on X-ray Line Polarization
… the radiative properties of HED plasmas. The Electron Beam Ion Trap (EBIT) and a few HED plasma facilities are utilized along with an advanced set of diagnostics. The HED plasma diagnostics include: x-ray spatially-resolved spectrometers and pinhole cameras, fast x-ray diodes, and an optical …
-
DEVICE DEVELOPMENT AND CHARACTERIZATION FOR SOLID-STATE QUANTUM COMPUTATION
… circuits, is remarkably mitigated on single-electron devices with Al/$\rm{AlO}_x$/Al tunnel junctions. By employing plasma oxidation and ultra-high vacuum (UHV) chambers, one manifestation of $\rm{AlO}_x$ instability -- the long-term charge offset drift of Al/$\rm{AlO}_x$/Al single-electron …
-
Experimental Realisation of Energy Harvesters built from Quantum Dots and Quantum Wells
… from an area of 90 μ m2 of a two-dimensional electron gas (2DEG), using the energy-selective transport of electrons through a pair of quantum dots. It has proven to be an effective technique for harvesting energy at the micro/nano scales. Our energy harvester can generate a power of 0.13fW in …
-
General relativistic radiation magnetohydrodynamics, with applications to black hole accretion disks
Electron temperatures in the inner region of accretion disks around black holes are set by the balance of advection, viscous heating, and radiative interactions. At the lowest accretion rates, radiative processes may be safely ignored, and electrons are nearly virial. Advection carries the lion's …
-
Ultraviolet and EUV studies of selected structures in the solar corona
… data) as the primary method for abundance study. Electron temperatures along the line of sight were derived applying the line ratio and the DEM techniques to both CDS and UVCS data. From the CDS data, electron densities along the line of sight were derived using the line ratio technique. For the …