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Title: DIRECT EXPERIMENTAL DETERMINATION OF SPATIAL TEMPERATURE, DENSITY AND MIX FOR LTE IMPLOSIONS

Abstract

No abstract prepared.

Authors:
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
785870
Report Number(s):
LA-UR-01-5018
TRN: US0200383
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Aug 2001
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DENSITY; IMPLOSIONS; TEMPERATURE DISTRIBUTION; LTE

Citation Formats

G. POLLAK. DIRECT EXPERIMENTAL DETERMINATION OF SPATIAL TEMPERATURE, DENSITY AND MIX FOR LTE IMPLOSIONS. United States: N. p., 2001. Web.
G. POLLAK. DIRECT EXPERIMENTAL DETERMINATION OF SPATIAL TEMPERATURE, DENSITY AND MIX FOR LTE IMPLOSIONS. United States.
G. POLLAK. Wed . "DIRECT EXPERIMENTAL DETERMINATION OF SPATIAL TEMPERATURE, DENSITY AND MIX FOR LTE IMPLOSIONS". United States. doi:. https://www.osti.gov/servlets/purl/785870.
@article{osti_785870,
title = {DIRECT EXPERIMENTAL DETERMINATION OF SPATIAL TEMPERATURE, DENSITY AND MIX FOR LTE IMPLOSIONS},
author = {G. POLLAK},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Aug 01 00:00:00 EDT 2001},
month = {Wed Aug 01 00:00:00 EDT 2001}
}

Conference:
Other availability
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  • In the field of inertial confinement fusion (ICF), work has been consistently progressing in the past decade toward a more fundamental understanding of the plasma conditions in ICF implosion cores. The research presented here represents a substantial evolution in the ability to diagnose plasma temperatures and densities, along with characteristics of mixing between fuel and shell materials. Mixing is a vital property to study and quantify, since it can significantly affect implosion quality. We employ a number of new spectroscopic techniques that allow us to probe these important quantities. The first technique developed is an emissivity analysis, which uses themore » emissivity ratio of the optically thin Ly{beta} and He{beta} lines to spectroscopically extract temperature profiles, followed by the solution of emissivity equations to infer density profiles. The second technique, an intensity analysis, models the radiation transport through the implosion core. The nature of the intensity analysis allows us to use an optically thick line, the Ly{alpha}, to extract information on mixing near the core edge. With this work, it is now possible to extract directly from experimental data not only detailed temperature and density maps of the core, but also spatial mixing profiles.« less
  • We report on the experiments aimed at obtaining core temperature and density maps in direct drive implosions at the OMEGA Laser Facility using multi-monochromatic X-ray imagers. These instruments use an array of pinholes and a flat multilayer mirror to provide unique multi-spectral images distributed over a wide spectral range. Using Argon as a dopant in the DD-filled plastic shells produces emission images in the Ar He-b and Ly-b spectral regions. These images allow the retrieval of temperature and density maps of the plasma. We deployed three identical multi-monochromatic X-ray imagers in a quasi-orthogonal line-of-sight configuration to allow tomographic reconstruction ofmore » the structure of the imploding core.« less
  • New techniques of x-ray spectroscopy have been developed to extract the temperature and density spatial structure of implosion cores. Results from an emissivity analysis, which neglects optical depth effects, compare well with the independent results of an intensity analysis used in the low optical depth limit. The intensity analysis has also been applied in its full form, in which case density spatial profiles demonstrate significant opacity effects. The emissivity and intensity analyses were combined to infer the spatial profile of mixing between shell and fuel material. This experimentally-derived information on mix is compared with predictions from two standard theoretical mixmore » models.« less