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 13 of 13 for “"plasma material interaction"”.
-
Characterization of ion properties in a linear pulsed plasma-material interaction test stand
… divertor regions of the magnetically confined plasma, tokamaks experience off-normal events in which high intensities of heat flux incident on wall component surfaces result in intolerable levels of damage. Proposed solid divertors will not be able to withstand these fluxes, especially in …
-
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 …
-
Advanced thermo-mechanical and plasma-material interaction characterization and testing methodologies of tungsten-based materials for neutron-relevant environments
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
-
Modeling enhanced impurity sputtering due to rf sheaths in front of ICRH actuators
… antenna. Here we present a semi-analytical fluid plasma model able to capture the enhanced sputtering yield from the Faraday Screen and the Plasma- Facing Components of an Ion Cyclotron Resonance Heating antenna in a fusion machine. The model is a one-dimensional phase-resolved model of a …
-
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, …
-
Deposition of aluminum oxide by evaporative coating at atmospheric pressure (ECAP)
… and microelectronics. Recently, the Center for Plasma-Material Interaction (CPMI) has developed innovative coating method of Evaporative Coating at Atmospheric Pressure (ECAP). This new idea is an atmospheric-pressure based process. By using the thermal energy of plasma, solid aluminum are …
-
A plasma-wall interaction model for the erosion of materials under ion bombardment
Understanding the evolution and behavior of materials exposed to plasma is critical for the design of future electric propulsion devices. As ions are ejected from the device generating thrust, they also impact the ceramic walls. This induces wall erosion, ultimately exposing the magnetic circuit …
-
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. …
-
The effect of ICRF and LHCD waveguide and launcher location on tritium breeding ratio and radiation damage in fusion reactors
… radio frequency (RF) waves used to heat the plasma and drive current are launched from the low-field, outboard side where there is more access space. It has recently been proposed to launch these waves from the high-field side [1-3], which increases current-drive efficiency, allows for better …
-
Development of high energy pulsed plasma simulator for plasma-lithium trench experiment
… lithium infused trench (LiMIT) device, a pulsed plasma source utilizing a theta pinch in conjunction with a coaxial plasma accelerator has been developed. An overall objective of the project is to develop a compact device that can produce 100 MW/m2 to 1 GW/m2 of plasma heat flux (a typical heat …
-
Deciphering the role of dispersoids in dispersion-strengthened tungsten alloys on the mechanical properties and irradiation- driven response under nuclear fusion reactor-relevant conditions
Tungsten is the material of choice for plasma-facing components in future plasma- burning fusion reactors because of its high melting point, high sputter threshold, and low hydrogenic species retention. However, tungsten is an intrinsically brittle material, displaying no room temperature ductility …
-
Experimental and computational magnetic surface mapping of the HIDRA stellarator
… previously run by the Max-Planck-Institut für Plasmaphysic in Greifswald under the name WEGA. Even with its much lower plasma temperature and density when compared to bigger machines such as EAST and W7-X, HIDRA can be used to conduct plasma-material interaction experiments. Its particle and …
-
Atomistic Simulation Of Plasma Interaction With Plasma Facing Components In Fusion Reactors
<p>The interaction between plasma and fusion relevant materials is one of the critical issues in successfully using those materials in Tokamak reactors. This research uses molecular dynamics, kinetic Monte Carlo and binary collision approximation methods to model fusion relevant material bombarded …