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 11 of 11 for “"Collisional Radiative Model"”.
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Development of 0 – D argon collisional radiative model conjoined with optical emission spectroscopy for radio frequency plasma
… a computational plasma diagnostic technique, collisional radiative model (CRM), has been gaining attention because it is a non-intrusive diagnostic technique that can compute electron properties by simulating the chemical network within a plasma system, unlike conventional OES while providing …
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Analysis of a Water Vapor Helicon Thruster Using Emission Spectroscopy
… plasma parameters for any propellant. A helium collisional radiative model was developed to estimate electron temperature and density from helium emission line ratios measured experimentally. Thruster tests conducted with pure helium were used to compare the collisional radiative model to …
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Dirac R-matrix scattering calculations in support of plasma diagnostics
… plasmas. In order to accurately represent the collisional processes for these species, scattering calculations are carried out using the relativistic Dirac R-matrix (DARC) and the semi-relativistic Breit-Pauli (BP) R-matrix codes. The results from these calculations, along with the atomic …
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Modeling of no radiative emission in non-equilibrium hypersonic flow
… in hypersonic shocks can be measured both by radiative emission and absorption measurements. NO is an ideal optical diagnostic tool because it has a significant absorption cross section, and is a strong emitter in the IR and the UV. The ability to model radiative emission from NO is therefore …
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Bombardment of Thin Lithium Films With Energetic Plasma Flows
… as it expands away from the target surface. A collisional-radiative model for both neutrals and singly ionized lithium is used to model the lithium vapor and is found to correlate well with the optical measurements. The vapor cloud electron temperature is found to vary from 2--3 eV with peak …
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The Self-Sustaining Processes in a Hollow Cathode to Produce a Steady Electron Emission
… secondary emitted electrons. Most computational models assume that only singly ionized particles are present, but in practice no plasma is composed of only singly ionized particles. The temperatures in the quasi-neutral gas and plasma are often assumed to be the same, but evidence suggest these …
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H (sub) alpha & Neutral Density Scaling in the Maryland Centrifugal eXperiment
… These profiles, together with an atomic collisional-radiative model, provide estimates of neutral hydrogen density and local charge-exchange times. Varied experimental parameters were applied to MCX discharges and the resulting variations in neutral density are compared to theoretical …
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Plasma Dynamics in a High-Power Helicon Source
… (OES) method in conjunction with the YACORA Collisional Radiative Model and an extended global model. OES is used to determine molecular translational, vibrational and rotational temperatures while considering surface recombination effects. It is also used to obtain the electron density and …
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Plasma Dynamics in a High-Power Helicon Source
… (OES) method in conjunction with the YACORA Collisional Radiative Model and an extended global model. OES is used to determine molecular translational, vibrational and rotational temperatures while considering surface recombination effects. It is also used to obtain the electron density and …
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Characterization of Argon and Ar/Cl<sub>2</sub> Plasmas Used for the Processing of Niobium Superconducting Radio-Frequency Cavities
… the sensitivity of photon reabsorption of radiative decay to measure the lower state (metastable and resonant) densities by taking ratios of spectral lines with a common upper level. This method has been gaining popularity as it does not require any <em>a priori</em> knowledge about the …
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Characterization of main ion properties for the optimization of future fusion power plants
… minority impurity measurements and theoretical models. In this thesis, a novel diagnostic method has been established that enables the direct experimental measurement of the main ions with a focus on the plasma edge. The plasma edge is a critical region, as it prescribes the boundary conditions …