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Imaging Thomson scattering measurements of radiatively heated Xe

Description: Uniform density and temperature Xe plasmas have been produced over >4 mm scale-lengths using x-rays generated in a cylindrical Pb cavity. The cavity is 750 {micro}m in depth and diameter, and is heated by a 300 J, 2 ns square, 1054 nm laser pulse focused to a spot size of 200 {micro}m at the cavity entrance. The plasma is characterized by simultaneous imaging Thomson scattering measurements from both the electron and ion scattering features. The electron feature measurement determines the sp… more
Date: May 1, 2012
Creator: Pollock, B.; Meinecke, J.; Kuschel, S.; Ross, J. S.; Divol, L.; Glenzer, S. H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Simulation Of Microtearing Turbulence In NSTX

Description: Thermal energy confinement times in NSTX dimensionless parameter scans increase with decreasing collisionality. While ion thermal transport is neoclassical, the source of anomalous electron thermal transport in these discharges remains unclear, leading to considerable uncertainty when extrapolating to future ST devices at much lower collisionality. Linear gyrokinetic simulations find microtearing modes to be unstable in high collisionality discharges. First non-linear gyrokinetic simulations of… more
Date: February 13, 2012
Creator: Guttenfelder, W.; Kaye, S. M.; Nevins, W. M.; Wanag, E.; Zhang, J.; Bell, R. E. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Assessment of an ORION-based experimental platform for measuring the opacity of high-temperature and high-density plasma

Description: The following provides an assessment of an experimental platform based on the ORION laser at AWE Aldermasten, England, for measuring the opacity of high-temperature and high-density LTE plasmas. The specific points addressed are (1) the range of electron density and temperature that can be achieved with short-pulse beams alone, as well as (2) by means of compression with a long-pulse beam; (3) the accuracy with which electron density, electron temperature, and absolute emissivity can be measure… more
Date: June 11, 2012
Creator: Beiersdorfer, P; Schneider, M & Shepherd, R
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Time-Resolved Soft X-Ray Spectra From Laser-Produced Cu Plasma

Description: The volumetric heating of a thin copper target has been studied with time resolved x-ray spectroscopy. The copper target was heated from a plasma produced using the Lawrence Livermore National Laboratory's Compact Multipulse Terrawatt (COMET) laser. A variable spaced grating spectrometer coupled to an x-ray streak camera measured soft x-ray emission (800-1550 eV) from the back of the copper target to characterize the bulk heating of the target. Radiation hydrodynamic simulations were modeled in… more
Date: May 2, 2012
Creator: Cone, K. V.; Dunn, J.; Baldis, H. A.; May, M. J.; Purvis, M. A.; Scott, H. A. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Imaging of High-Energy X-Ray Emission from Cryogenic Thermonuclear Fuel Implosions on the NIF

Description: Accurately assessing and optimizing the implosion performance of inertial confinement fusion capsules is a crucial step to achieving ignition on the NIF. We have applied differential filtering (matched Ross filter pairs) to provide spectrally resolved time-integrated absolute x-ray self-emission images of the imploded core of cryogenic layered targets. Using bremsstrahlung assumptions, the measured absolute x-ray brightness allows for the inference of electron temperature, electron density, hot… more
Date: May 1, 2012
Creator: Ma, T
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Final Report Spacially-Resolved Diagnostics and Modeling of Micro-Discharges

Description: Optical emission spectroscopy measurements were performed with added trace probe gases in an atmospheric pressure direct current (DC) helium microplasma. Spatially resolved measurements (resolution {approx} 6 {micro}m) were taken across a 200 {micro}m slot-type discharge. Stark splitting of the hydrogen Balmer-line was used to investigate the electric field distribution in the cathode sheath region. Electron densities were evaluated from the analysis of the spectral line broadenings of H-{beta}… more
Date: August 9, 2012
Creator: Donnelly, Vincent M. & Economou, Demetre J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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