A5077399688- Ionosphere and magnetosphere dynamics
- Magnetic confinement fusion research
- Plasma Diagnostics and Applications
- Plasma Applications and Diagnostics
- Laser-induced spectroscopy and plasma
- Solar and Space Plasma Dynamics
- Electrohydrodynamics and Fluid Dynamics
- Fluid Dynamics and Turbulent Flows
- Superconducting Materials and Applications
- Aerosol Filtration and Electrostatic Precipitation
- Nuclear Materials and Properties
- Fusion materials and technologies
- Lightning and Electromagnetic Phenomena
- Space Satellite Systems and Control
- High voltage insulation and dielectric phenomena
- Mass Spectrometry Techniques and Applications
- Silicon Carbide Semiconductor Technologies
- Electrostatic Discharge in Electronics
- Advanced materials and composites
- Complex Systems and Time Series Analysis
- Geophysics and Sensor Technology
- Advanced ceramic materials synthesis
- Laser Design and Applications
- Laser-Plasma Interactions and Diagnostics
- Spacecraft and Cryogenic Technologies
West Virginia University
2014-2021
University of San Diego
2010
Temporal measurement of electron density, metastable-atom and reduced electric field are used to infer the dynamic behavior excitation rates describing electron-atom collision-induced in positive column a 1 Torr argon plasma by invoking plausible assumptions regarding shape energy distribution function performed Adams et al (2012 Phys. Plasmas 19 023510). These inferred predict 420.1 nm 419.8 emission ratio, which agree with experimental results when applicable. Thus observed ratio is...
Local fluctuations of electrostatic potential, poloidal electric field, magnetic potential and electron density are simultaneously measured in the T-10 tokamak by a heavy ion beam probe (HIBP) having five-slit energy analyser, which allows an estimate turbulent particle flux $\boldsymbol {E}\times \boldsymbol {B}$ rotation velocity off-minor-axis gradient zone toroidal plasma column. The high spatial temporal resolution modern multichannel HIBP makes it effective tool to study oscillations....
The attention to a detailed analysis by Sadeghi [1] of our paper [2], using Weatherford and Barnat [3] for reference information is appreciated motivates us clarify points in referred the Comment [1]. In this Reply, we respond two remarks claiming render as unjustified original conclusion based on validity 420.1/419.8 nm emission intensity ratio method estimate argon metastable density, clear up other possible misinterpretations data presented [2].
In the post-transient stage of a 1-Torr pulsed argon discharge, computationally assisted diagnostic technique is demonstrated for either inferring electron energy distribution function (EEDF) if metastable-atom density known (i.e., measured) or quantitatively determining EEDF known. This technique, which can be extended to applicable initial and transient stages based on sensitivity both emission line ratio values density, EEDF, correlating measurements reduced electric field, pairs...
Azimuthal convective flow and density-depleted magnetic field-aligned current co-located in the helium plasma produced large device (LAPD-U) at UCLA (Gekelman et al 2016 Rev. Sci. Instrum. 87 025105) support an Alfvénic perturbation that is static laboratory frame. Electrostatic probes measure density perturbations 72 cm-diameter, 12 m-long, afterglow plasma, wherein a radially segmented electrode creates off-cylindrical-axis planar-mesh draws channel parallel to background field. This...
Temporal measurements of the electron density, metastable-atom and reduced electric field demonstrate that four orders magnitude variation in dynamic range electron-atom collision-induced excitation rates takes place during 2.0 kV height, 40 µs duration repeating pulse applied to a 100 Pa (1 Torr), argon positive column hollow-cathode discharge. Correlation between density emission-line ratio is demonstrated be sufficiently reliable infer one quantity based on measurement other Initiation,...
Hot electron cyclotron emission (ECE) measurements and modeling calculations have been carried out for the Levitated Dipole Experiment (LDX)5. Heterodyne radiometers at 110, 137 165 GHz used to view plasma from bottom midplane locations. An intense environment of harmonic ECE up 1 keV 110 afterglow decay times 6.9 seconds were observed lower pressures. Interpretation levels in terms hot parameters requires integrating modeled over a large magnetic field range 0.09 3.2 Tesla k B angular 0 90°...
Electromagnetic vacuum fluctuations underlie the van der Waals and Casimir forces, which dominate much of dynamics at nanoscale. Here we propose a means to harness these forces transmit intense, high-frequency mechanical pressure power between surfaces across pure vacuum. Potentially large densities (P > 108 W/m2) should be sufficient acoustically probe or heat bulk samples; melt, vaporize chemically alter surfaces. Power deposition can made highly local, perhaps down tens square nanometers,...
Direct measurement of the intensities Ar 420.1nm and 419.8nm spectral lines, independent meta-stable-atom density, electron temperature, inferred reduced electric field, assumptions shape energy distribution in a 1-torr argon discharge are correlated within extended-corona-model framework applied to late stage pulsed discharge-tube plasma determine reaction rate constants k <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ij</sub> <sup...