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Title: High-resolution optical measurements of surface roughness for beta-layered deuterium-tritium solid inside a re-entrant copper cylinder

Abstract

A high-resolution optical imaging system and custom-designed image analysis software are used to make surface roughness measurements for deuterium-tritium (D-T) solid layers, equilibrated inside a 2-mm-inside-diameter re-entrant copper cylinder. Several experiments are performed that yield D-T layer thicknesses of between 75 and 139 {mu}m, with equilibration temperatures between 17.4 and 18.8 K. A 1024- x 1024-pixel charge-coupled-device imaging camera, coupled with a Maksutov-Cassegrain long-range microscope, produces a 2.5-{mu}m (single-pixel) image resolution. The error function fitting of the image analysis data produces submicron resolution of the layer interior surface finish. The length scale for the cylinder inner bore is just over 6 mm, and the final layer surface roughness for this length ranges from 3- to 1.7-{mu}m root-mean-square. The feasibility is being explored of using these highly uniform and smooth D-T solid layers inside future targets for inertial confinement fusion reactors to produce surface finishes that will meet target design requirements for the National Ignition Facility. Techniques for improving the D-T solid layer surface finish are examined, limitations of the current D-T cell configuration and fuel mix are discussed, and cell configurations for future experiments are described. 10 refs., 8 figs.

Authors:
; ;  [1];  [2]
  1. Los Alamos National Lab., NM (United States)
  2. Lawrence Livermore National Lab., CA (United States)
Publication Date:
OSTI Identifier:
380828
DOE Contract Number:  
W-7405-ENG-36; W-7405-ENG-48; AC03-91SF18601
Resource Type:
Journal Article
Journal Name:
Fusion Technology
Additional Journal Information:
Journal Volume: 30; Journal Issue: 1; Other Information: PBD: Sep 1996
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; ROUGHNESS; SURFACE PROPERTIES; OPTICAL SYSTEMS; DESIGN; TARGETS; SURFACE FINISHING; MEASURING METHODS; THERMONUCLEAR REACTORS; INERTIAL CONFINEMENT; ICF DEVICES; D-T REACTORS; DATA ANALYSIS

Citation Formats

Sheliak, J D, Hoffer, J K, Foreman, L R, and Mapoles, E R. High-resolution optical measurements of surface roughness for beta-layered deuterium-tritium solid inside a re-entrant copper cylinder. United States: N. p., 1996. Web.
Sheliak, J D, Hoffer, J K, Foreman, L R, & Mapoles, E R. High-resolution optical measurements of surface roughness for beta-layered deuterium-tritium solid inside a re-entrant copper cylinder. United States.
Sheliak, J D, Hoffer, J K, Foreman, L R, and Mapoles, E R. Sun . "High-resolution optical measurements of surface roughness for beta-layered deuterium-tritium solid inside a re-entrant copper cylinder". United States.
@article{osti_380828,
title = {High-resolution optical measurements of surface roughness for beta-layered deuterium-tritium solid inside a re-entrant copper cylinder},
author = {Sheliak, J D and Hoffer, J K and Foreman, L R and Mapoles, E R},
abstractNote = {A high-resolution optical imaging system and custom-designed image analysis software are used to make surface roughness measurements for deuterium-tritium (D-T) solid layers, equilibrated inside a 2-mm-inside-diameter re-entrant copper cylinder. Several experiments are performed that yield D-T layer thicknesses of between 75 and 139 {mu}m, with equilibration temperatures between 17.4 and 18.8 K. A 1024- x 1024-pixel charge-coupled-device imaging camera, coupled with a Maksutov-Cassegrain long-range microscope, produces a 2.5-{mu}m (single-pixel) image resolution. The error function fitting of the image analysis data produces submicron resolution of the layer interior surface finish. The length scale for the cylinder inner bore is just over 6 mm, and the final layer surface roughness for this length ranges from 3- to 1.7-{mu}m root-mean-square. The feasibility is being explored of using these highly uniform and smooth D-T solid layers inside future targets for inertial confinement fusion reactors to produce surface finishes that will meet target design requirements for the National Ignition Facility. Techniques for improving the D-T solid layer surface finish are examined, limitations of the current D-T cell configuration and fuel mix are discussed, and cell configurations for future experiments are described. 10 refs., 8 figs.},
doi = {},
url = {https://www.osti.gov/biblio/380828}, journal = {Fusion Technology},
number = 1,
volume = 30,
place = {United States},
year = {1996},
month = {9}
}