A5030438470- Plasma Diagnostics and Applications
- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Fusion materials and technologies
- Laser-Plasma Interactions and Diagnostics
- Muon and positron interactions and applications
- Particle Accelerators and Free-Electron Lasers
- Ionosphere and magnetosphere dynamics
- Magnetic Field Sensors Techniques
- Heat Transfer and Boiling Studies
- Cytokine Signaling Pathways and Interactions
- Infectious Diseases and Tuberculosis
- Microwave Engineering and Waveguides
- Glioma Diagnosis and Treatment
- Nosocomial Infections in ICU
- Spacecraft and Cryogenic Technologies
- Tuberculosis Research and Epidemiology
- Pancreatic and Hepatic Oncology Research
- Electromagnetic Compatibility and Measurements
- Biliary and Gastrointestinal Fistulas
- Heat Transfer and Optimization
- Electron and X-Ray Spectroscopy Techniques
- Sexual Differentiation and Disorders
- Cell Adhesion Molecules Research
- Gastrointestinal disorders and treatments
University of Illinois Urbana-Champaign
2017-2020
Oak Ridge National Laboratory
2017-2020
University of Tennessee at Knoxville
2018
Australian National University
2017
Antenna radiation patterns in the vicinity of a helicon antenna are investigated hydrogen plasmas produced MAGPIE linear plasma device. Using uniform cold-plasma full-wave code, we model wave physics and find good agreement with experimental measurements. We show for first time which elements device couple most strongly to discuss physical mechanism that determines this effect. Helicon wavefields near field best described terms group velocity ray direction, while far from antenna, behave...
The Proto-MPEX helicon source has been operating in a high electron density 'helicon-mode'. Establishing plasma densities and magnetic field strengths under the antenna that allow for formation of normal modes fast-wave are believed to be responsible A 2D finite-element full-wave model on is used identify steady-state profile produced by source. We also show through simulation regions operation which core power deposition maximum slow-wave does not deposit significant besides directly...
The Prototype Material Plasma Exposure eXperiment (Proto-MPEX) is being used to qualify the plasma source and heating systems for (MPEX). MPEX will address important urgent research needs on material interactions future fusion reactors. In MPEX, plasma-facing components (nonirradiated a priori neutron irradiated) be exposed conditions as they are expected in steady-state device enabled by superconducting magnets, able break into new ground assessing materials at an ion fluence level range of...
We present time-resolved measurements of an edge-to-core power transition in a light-ion (deuterium) helicon discharge the form infra-red camera imaging thin stainless steel target plate on Proto-Material Exposure eXperiment device. The images measure two-dimensional distribution deposition discharge. displays mode characterized by significant increase on-axis electron density and core coupling, suppression edge formation fast-wave radial eigenmode. Although self-consistent mechanism that...
The Materials Plasma Exposure eXperiment (MPEX) is a linear plasma device that will address the plasma-material interaction (PMI) science for future fusion reactors and enable testing of plasma-facing components (PFCs). It designed as steady-state eventually delivering an ion fluence up to 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">31</sup> m xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> target. be handle neutron-activated...
The physics of electron and ion heating high-density deuterium helicon plasmas (&gt;3 × 1019 m−3) in the Proto-Material Plasma Exposure Experiment linear device are under investigation. Theoretical estimates indicate that for efficient heating, discharges with very low neutral gas content (≪0.1 Pa) sections required to minimize collisional losses charge exchange interactions neutrals. However, this requirement is typically not compatible pressures (1–2 commonly used high-density,...
Ion cyclotron heating (ICH) on the Prototype Material Plasma Exposure eXperiment (Proto-MPEX) is to be accomplished using “beach-heating” technique. Beach has not been previously demonstrated efficiently heat core ions at high electron density values present in Proto-MPEX. This work numerically investigates wave propagation characteristics of ICH region Proto-MPEX explore avenues for efficient ion heating. The analysis reveals that finite temperature effects are required predict Cold plasma...
The physics of ion cyclotron heating (ICH) relevant to the steady-state linear machine MPEX (Material Plasma Exposure eXperiment) has been explored in its predecessor, short-pulse device: Proto-MPEX. will utilize fundamental ICH increase heat flux at target and produce temperatures velocity distributions with improved fidelity those found a tokamak divertor region, comparison produced by substrate biasing. In experiments on Proto-MPEX described here, bulk up ∼ 15 eV have achieved 20 kW net...
This paper reports on the observation of controlled underdense electron heating for high heat flux applications in Prototype Material Plasma Exposure eXperiment. The goal this experiment is to demonstrate source and concepts create a intensity plasma at material targets study plasma-material interactions similar conditions magnetic fusion divertors. A 80 kW helicon 13.56 MHz used density production 15 microwave 28 GHz heating. For densities ∼5 × 1018 m−3, temperature target location...
Linear plasma devices are cost-effective alternatives for testing materials under reactor-relevant divertor conditions. An intense radio-frequency (RF) source concept the Material Plasma Exposure eXperiment (MPEX) is development at Oak Ridge National Laboratory. The concept, Proto-MPEX, aims to produce high-density background deuterium helicon plasmas (ne>3×1019 m−3) that subsequently heated with additional RF and microwave systems deliver conditions studies on plasma-material interaction....
Plasma material interaction (PMI) studies are crucial to the successful development of future fusion reactors. Prototype Material Exposure eXperiment (Proto-MPEX) is a prototype design for MPEX, steady-state linear device being developed study PMI. The primary purpose Proto-MPEX developing plasma heating source concepts MPEX. A power accounting works identify machine operating parameters that could improve its performance, thereby increasing PMI research capabilities, potentially impacting...
Ion cyclotron heating (ICH) at a frequency in the 6- to 9-MHz range with electron 28- 105-GHz will be used Material Plasma Exposure eXperiment (MPEX) greatly increase energy of plasma stream produced by helicon source. ICH was chosen over substrate biasing produce energetic ions because it can more accurately reproduce plasma-material interactions fusion device. For instance, when target is tilted respect background magnetic field during ICH, presheath created so that redeposition phenomena...
The Prototype Material Plasma Exposure eXperiment (Proto-MPEX) is a linear device used to develop the source and heating concept for MPEX, an experiment study plasma-material interactions future fusion reactors. This article will highlight recent analysis results on Proto-MPEX using infrared (IR) camera, key tool imaging heat fluxes measured at material target. target are crucial understanding concepts. includes application of homography 3-D finite-element methods provide between-shot...
The source technology for the Plasma Materials Exposure eXperiment (MPEX) is currently being developed on Proto-MPEX device at Oak Ridge National Laboratory1 to study fusion relevant plasma material interactions a linear machine. Radio frequency (RF) used and heating of Proto-MPEX. A helicon source, powered with> 100 kW RF power 13.56 MHz, produces steady state with peak electron density of> 6e19 m-3, Additional sources include Electron Bernstein Waves heat electrons temperatures > 15 e V,...