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Title: Production of direct drive cylindrical targets for inertial confinement fusion experiments

Abstract

We have made targets with cylindrical geometry for Inertial Confinement Fusion (ICF) experiments. These targets are used in hydrodynamic experiments on the OMEGA laser at the University of Rochester. The cylindrical design allows the study of three dimensional hydrodynamic effects in a pseudo 2D mode, simplifying data gathering and analysis. Direct drive refers to the fact that the target is illuminated directly by approximately 50 laser beams and is imploded by the material pressure generated from ablation of the outside of the target. The production of cylindrical targets involves numerous steps. These steps are shared in common with many other types of ICF targets but no other single target type encompasses such a wide range of fabrication techniques. These targets consist of a large number of individual parts, all fabricated from commercially purchased raw material, requiring many machining, assembly, electroplating and chemical process steps. Virtually every manufacturing and assembly process we currently possess is involved in the production of these targets. The generic target consists of a plastic cylinder (ablator) that is roughly lmm in diameter by 2.25mm long. The wall of the cylinder is roughly 0.07mm thick. There is an aluminum cylinder 0.5mm wide and O.Olmm thick centered onmore » the inside of the plastic cylinder and coaxial with the outside plastic cylinder. The outside of this aluminum band has surface finishes of differing random average roughness. The required average surface roughness is determined in advance by experimental design based on the amount of turbulent mix to be observed. The interior of the cylinder is filled with low density polystyrene foam that is made in house. To produce a finished target additional features are added to each target. X-ray backlighters are cantilevered off the target that allow time resolved x-ray images of the imploding target to be recorded during the experiment. The x-ray backlighters are driven by additional laser beams that are delayed to record an image at the appropriate time after the main beams are fired. An aperture to limit the area imaged and reduce x-ray background is placed on the target opposite the backlighters. Finally, alignment fibers that allow the target to be located precisely in three dimensional space before being shot are placed in several locations on the outside of the target.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8]
  1. (Norman E.)
  2. (Robert D.)
  3. (Douglas J.)
  4. (David L.)
  5. (Veronica M.)
  6. (Timothy H.)
  7. (Joyce E.)
  8. (Ruben)
Publication Date:
Research Org.:
Los Alamos National Laboratory
Sponsoring Org.:
USDOE
OSTI Identifier:
976494
Report Number(s):
LA-UR-02-7655
TRN: US1006469
Resource Type:
Conference
Resource Relation:
Conference: Submitted to: 2003 Winter Topical Meeting, American Society for Precision Engineering, University of Florida - January 22-23, 2003
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABLATION; ALIGNMENT; ALUMINIUM; APERTURES; DESIGN; ELECTROPLATING; FABRICATION; FIBERS; GEOMETRY; HYDRODYNAMICS; INERTIAL CONFINEMENT; LASERS; MACHINING; MANUFACTURING; PLASTICS; POLYSTYRENE; PRODUCTION; RAW MATERIALS; ROUGHNESS; TARGETS

Citation Formats

Elliott, N. E., Day, R. D., Hatch, D. J., Sandoval, D. L., Gomez, V. M., Pierce, T. H., Elliott, J. E., and Manzanares, R.. Production of direct drive cylindrical targets for inertial confinement fusion experiments. United States: N. p., 2002. Web.
Elliott, N. E., Day, R. D., Hatch, D. J., Sandoval, D. L., Gomez, V. M., Pierce, T. H., Elliott, J. E., & Manzanares, R.. Production of direct drive cylindrical targets for inertial confinement fusion experiments. United States.
Elliott, N. E., Day, R. D., Hatch, D. J., Sandoval, D. L., Gomez, V. M., Pierce, T. H., Elliott, J. E., and Manzanares, R.. Tue . "Production of direct drive cylindrical targets for inertial confinement fusion experiments". United States. https://www.osti.gov/servlets/purl/976494.
@article{osti_976494,
title = {Production of direct drive cylindrical targets for inertial confinement fusion experiments},
author = {Elliott, N. E. and Day, R. D. and Hatch, D. J. and Sandoval, D. L. and Gomez, V. M. and Pierce, T. H. and Elliott, J. E. and Manzanares, R.},
abstractNote = {We have made targets with cylindrical geometry for Inertial Confinement Fusion (ICF) experiments. These targets are used in hydrodynamic experiments on the OMEGA laser at the University of Rochester. The cylindrical design allows the study of three dimensional hydrodynamic effects in a pseudo 2D mode, simplifying data gathering and analysis. Direct drive refers to the fact that the target is illuminated directly by approximately 50 laser beams and is imploded by the material pressure generated from ablation of the outside of the target. The production of cylindrical targets involves numerous steps. These steps are shared in common with many other types of ICF targets but no other single target type encompasses such a wide range of fabrication techniques. These targets consist of a large number of individual parts, all fabricated from commercially purchased raw material, requiring many machining, assembly, electroplating and chemical process steps. Virtually every manufacturing and assembly process we currently possess is involved in the production of these targets. The generic target consists of a plastic cylinder (ablator) that is roughly lmm in diameter by 2.25mm long. The wall of the cylinder is roughly 0.07mm thick. There is an aluminum cylinder 0.5mm wide and O.Olmm thick centered on the inside of the plastic cylinder and coaxial with the outside plastic cylinder. The outside of this aluminum band has surface finishes of differing random average roughness. The required average surface roughness is determined in advance by experimental design based on the amount of turbulent mix to be observed. The interior of the cylinder is filled with low density polystyrene foam that is made in house. To produce a finished target additional features are added to each target. X-ray backlighters are cantilevered off the target that allow time resolved x-ray images of the imploding target to be recorded during the experiment. The x-ray backlighters are driven by additional laser beams that are delayed to record an image at the appropriate time after the main beams are fired. An aperture to limit the area imaged and reduce x-ray background is placed on the target opposite the backlighters. Finally, alignment fibers that allow the target to be located precisely in three dimensional space before being shot are placed in several locations on the outside of the target.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 2002},
month = {Tue Jan 01 00:00:00 EST 2002}
}

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