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Proceedings Paper

Management of unconverted light for the National Ignition Facility target chamber
Author(s): Pamela K. Whitman; Alan K. Burnham; Mary A. Norton; Francois Y. Genin; J. M. Scott; Wilthea J. Hibbard; K. Bletzer; Andrew T. Anderson; Sham N. Dixit
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Paper Abstract

The NIF target chamber beam dumps must survive high x-ray, laser, ion, and shrapnel exposures without excessive generation of vapors or particulate that will contaminate the final optics debris shields, thereby making the debris shields susceptible to subsequent laser damage. The beam dumps also must be compatible with attaining and maintaining the required target chamber vacuum and must not activate significantly under high neutron fluxes. Finally, they must be developed, fabricated, and maintained for a reasonable cost. The primary challenge for the beam dump is to survive up to 20 J/cm2 of 1 micrometers light and 1-2 J/cm2 of nominally 200-350 eV blackbody temperature x-rays. Additional threats include target shrapnel, and other contamination issues. Designs which have been evaluated include louvered hot-pressed boron carbide or stainless steel panels, in some cases covered with transparent Teflon film, and various combinations of inexpensive low thermal expansion glasses backed by inexpensive absorbing glass.

Paper Details

Date Published: 23 July 1999
PDF: 12 pages
Proc. SPIE 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, (23 July 1999); doi: 10.1117/12.354186
Show Author Affiliations
Pamela K. Whitman, Lawrence Livermore National Lab. (United States)
Alan K. Burnham, Lawrence Livermore National Lab. (United States)
Mary A. Norton, Lawrence Livermore National Lab. (United States)
Francois Y. Genin, Lawrence Livermore National Lab. (United States)
J. M. Scott, Univ. of California/Berkeley (United States)
Wilthea J. Hibbard, Lawrence Livermore National Lab. (United States)
K. Bletzer, Lawrence Livermore National Lab. (United States)
Andrew T. Anderson, Lawrence Livermore National Lab. (United States)
Sham N. Dixit, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 3492:
Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion
W. Howard Lowdermilk, Editor(s)

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