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 29 for “"plasma-material interactions"”.
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Coupling a Boltzmann plasma and BCA surface for the kinetic treatment of plasma-material interactions
DSpace SAF Submission Ingestion Package generated from Vireo submission #11546 on 2017-09-29 at 11:32:22
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An in-situ accelerator-based diagnostic for plasma-material interactions science in magnetic fusion devices
Plasma-material interactions (PMI) in magnetic fusion devices such as fuel retention, material erosion and redeposition, and material mixing present significant scientific and engineering challenges, particularly for the next generation of devices that will move towards reactor-relevant conditions. …
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Kinetic modeling of plasma-material interactions by coupling particle-in-cell and binary collision approximation codes
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Hybrid Illinois Device for Research and Applications material analysis test-stand development for characterization of fusion plasma-material interactions
… hybrid that is wholly dedicated to the study of material science, mainly research pertaining to fusion plasma facing components (PFCs). HIDRA’s long-pulse steady-state stellarator plasmas provide a unique plasma environment to test materials under the harsh conditions they will experience in a …
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Plasma-Material Interactions: A Langmuir Probe Analysis of a Cylindrical SiO(2) Deposition System and a Computational Study Using VFTRIM3D
… permeation qualities and are correlated to the plasma properties gathered using Langmuir probes as well as the gas, pressure, and time recipes used to produce them. It is found in this work that the application of $\rm SiO\sb2$ films onto flexible PET bottles using the fashion explained herein …
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Continuum Kinetic Simulations of Plasma Sheaths and Instabilities
A careful study of plasma-material interactions is essential to understand and improve the operation of devices where plasma contacts a wall such as plasma thrusters, fusion devices, spacecraft-environment interactions, to name a few. This work aims to advance our understanding of fundamental …
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A novel measurment of net erosion and plasma-material interaction in plasma thrusters
The lifetime of plasma thrusters is usually limited not by depletion of the propellant supply, but by erosion of the magnetic circuit from plasma particles bombarding the walls of the acceleration channel leading eventually to catastrophic engine failure. As erosion is the primary failure mode of …
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A Continuum Kinetic Investigation into the Role of Transport Physics in the Bohm Speed formulation
When plasmas come in contact with the boundaries that confine them, various complex processes occur between the plasma and the materials in the boundary. These processes, called plasma-material interactions (PMI) lead to physical and chemical modifications in the materials and in the plasma. In the …
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Methods for the analysis of low-Z plasma facing surfaces in magnetic fusion applications
… have led to considerable improvements in plasma density, temperature, and confinement time, research also suggests that materials selection in plasma-facing components (PFCs) can also have a substantial impact on plasma performance. Within the plasma-material interaction (PMI) community, …
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Heat transfer analysis of thermoelectric driven swirling flow
… heat from the divertor region. The solid plasma facing materials (PFM) suffer from the sputtering and thermal stress. An alternative way is to utilize liquid metal especially the liquid lithium as the divertor material. An experiment on CDX-U found that a shallow pool of liquid lithium …
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Emitting Wall Boundary Conditions in Continuum Kinetic Simulations: Unlocking the Effects of Energy-Dependent Material Emission on the Plasma Sheath
… Hall thruster and the tokamak, understanding the plasma-material interactions which take place at the wall is important for improving performance and preventing failure due to material degradation. In the region near a surface, the plasma sheath forms and regulates the electron and ion fluxes into …
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Helium retention induced by in-operando lithium evaporation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-09-16 without embargo terms
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Radical probe system for in-situ measurements of radical densities of hydrogen, oxygen and nitrogen
… optical equipment. In this study Center for Plasma Material Interactions (CPMI) at the University of Illinois developed an in-situ catalytic radical probe system together with Ra-Den software platform to measure concentrations of reactive species in low temperature plasma with high spatial …
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Characterization of Liquid Metal Free Surface Response to an Electromagnetic Impulse and Implications for Future Nuclear Fusion Devices
… (LMs) are compelling candidates for use as plasma facing components (PFCs) in fusion devices to mitigate heat loading, limit damage due to erosion, and possibly breed tritium. When used as electrodes, such as in z-pinch devices, PFCs are subject to large current and magnetic flux densities …
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F-TRIDYN: A Monte-Carlo, BCA code for modeling ion-surface interactions with rough materials and coupling plasma and material codes
… and additional output modes for coupling to plasma edge and material codes. Surface roughness plays an important role in ion irradiation processes such as sputtering; roughness can significantly increase the angle of maximum sputtering and strongly affect the sputtering yield. The complete …
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The Effects of Collisions on Plasma-Sheath Transition
The plasma sheath is essential for understanding the plasma-material interaction (PMI) since it regulates the plasma particle and energy fluxes to the wall. The key concept in sheath theory is the Bohm criterion that gives the lower bound of the plasma exit flow speed, also known as the Bohm speed. …
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Using Machine Learning to Generate a Surrogate Model for Plasma-Surface Interactions
Plasma-surface interactions are an important effect in laboratory plasmas, but too complicatedto be modelled directly in plasma simulations. However, plasma surface interactions can be modelled by Transport and Range of Ions in Matter (TRIM) simulations based on a binary collision approximation of …
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Multiscale numerical simulations of the magnetized plasma sheath with massively parallel electrostatic particle-in-cell code
Understanding the physics of the plasma boundary and plasma-surface interactions is one of the key scientific challenges in fusion science and engineering. Large-scale integrated simulations and high-performance computing can provide valuable insights on the dynamic phenomena involved at the …
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Ion-cathode bombardment for the creation of tightly bound deuterium clusters in palladium
This Thesis was approved for publication on 2017-12-11 at 14:01.
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The effects of thermal history and composition on the thermodynamic behaviour of helium in tungsten and tungsten-based alloys
… of the new century. However, containing a plasma with a core temperature ten times hotter than that of the sun is no easy task. The confinement vessel must be constructed from resilient materials that can withstand both the heat and the bombardment of the plasma species. ITER is the first …
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