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Showing 1 to 20 of 46 for “"Plasma facing components"”.
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Liquid lithium loop development for open surface plasma facing components
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-05-01
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Simulated Material Erosion from Plasma Facing Components in Tokomak Reactors
… in the future large tokamak ITER. Electrothermal plasma sources operating in the confined controlled arc discharge regime produce heat fluxes in the range expected for hard disruptions in future large tokamaks. The radiative heat flux produced inside of the capillary discharge channel is from the …
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Interaction of plasmas with lithium and tungsten fusion plasma facing components
… fusion is the interaction of the fusion plasma with the first wall of the device; an interaction which is strongest in the divertor region. Erosion, melting, sputtering, and deformation are all concerns which inform choices of divertor material. Of the many materials proposed for use in …
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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 …
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Advancement of liquid lithium plasma-facing components for next-generation fusion devices
… of these challenges is handling the large heat, plasma and neutron fluxes exhausted from the core plasma. Current tokamak design points assume a steady state heat flux of 10MW/m2 increasing to values >1GW/m2 in transient events and particle fluxes > 1 × 1023m−2s−1. Flowing liquid lithium Plasma …
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Response Of Plasma Facing Components In Tokamaks Due To Intense Energy Deposition Using Particle-In-Cell(pic) Methods
<p>Damage to plasma-facing components (PFC) due to various plasma instabilities is still a major concern for the successful development of fusion energy and represents a significant research obstacle in the community. It is of great importance to fully understand the behavior and lifetime …
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Plasma Facing Components conditioning techniques and their correlation with plasma performance in the National Spherical Torus eXperiment Upgrade (NSTX-U)
The effect of Plasma Facing Components (PFC) conditioning with boronization on plasma performance in the National Spherical Torus eXperiment Up- grade (NSTX-U) has been investigated in this work. A novel PFC diagnostic, the Materials Analysis Particle Probe (MAPP) was commissioned in NSTX-U and was …
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Developing machine learning interatomic potentials to probe the plasma-materials interactions of tungsten-based high-entropy alloys as plasma-facing components
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-05-01
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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 …
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Fullerene C60 based nanostructures by self-assembly and molecular recognition
… pose a threat to the function of expensive components used in space and nuclear reactors. Therefore, Carbon- Carbon composites been an alternative choice for fusion reactor plasma facing components because of their low atomic number, superior thermal shock resistance, higher melting …
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Low-Energy Ion-Induced Angularly-Resolved Sputtering Measurements
… sputtering is important for both the lifetime of plasma facing components as well as contamination of the plasma. In plasma processing the sputtering process is involved in etching directly, and deposition through the sputtering of target materials. An apparatus and method have been created and …
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Design and Characterization of a Dust Injector for Future Studies of Tungsten Dust in the STOR-M Plasma
Dust generation from Plasma Facing Components (PFC) is a problem for tokamaks as they approach suitable reactor conditions. Tungsten dust is especially detrimental in the core, due to associated high Z bremsstrahlung power losses. As Tungsten is a primary candidate for PFC materials in large …
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External proton beam analysis of plasma facing materials for magnetic confinement fusion applications
… to perform in-air ion beam analysis on plasma facing divertor tiles from the Alcator C-Mod tokamak. A Particle Induced Gamma Emission (PIGE) technique was developed for boron depth profiling. In addition, Particle Induced X-ray Emission (PIXE) was implemented and used for a comprehensive …
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Modeling the Dynamics of Liquid Metal in Fusion Liquid Walls Using Maxwell-Navier-Stokes Equations
… in the context of utilizing liquid metals as plasma-facing components in fusion reactors. In the Z-pinch fusion process, electric current travels through a plasma column and enters into a pool of liquid metal. The current flowing through the liquid metal generates Lorentz force, which deforms …
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Flow control and associated technologies to advance the application of TEMHD-driven liquid lithium in fusion devices
… devices, evidence points to the fact that solid plasma facing components will not be able to endure the conditions without extensive damage. Plasma-materials interactions with these surfaces lead to material defects, impurity formation, and cooling of the edge plasma. In order to alleviate these …
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Gamma ray production cross sections of proton bombardment of fluorine for light element analysis and depth profiling
… performance and the surface conditions of the plasma facing components (PFC), diagnostic techniques that monitor the conditions of PFCs are useful. One ion beam analysis (IBA) diagnostic technique utilizes particle induced gamma emission (PIGE) analysis to diagnose the conditions of PFCs. Gamma …
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Interpretable Machine Learning for Prediction and Avoidance of Disruptions in Tokamak Plasmas
Tokamak plasmas are sometimes terminated due to off-normal events called disruptions, which are characterized by successive thermal and current quench events that deplete the stored thermal and magnetic energy. In addition to the costs of disruptions due to loss of confinement and operation, their …
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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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Machine Learning and Deep Learning applications for the protection of nuclear fusion devices
… of “disruptions”, and sudden terminations of plasma confinement. For the development and testing of machine learning classifiers, a total of 198 disrupted discharges and 219 regularly terminated discharges from JET. Convolutional Neural Networks (CNNs) were proposed to extract the …
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Characterization of the dynamic formation of nano-tendril surface morphology on tungsten while exposed to helium plasma
… of how tungsten fuzz affects the performance of plasma-facing components. The necessity of helium irradiation of the surface to induce nano-tendril growth motivates investigation into the dynamic process of helium implantation and accumulation in the surface. In this thesis, in situ elastic …
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