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Proceedings Paper

Optomechanical considerations for the VISAR diagnostic at the National Ignition Facility (NIF)
Author(s): Morris I. Kaufman; John R. Celeste; Brent C. Frogget; Tony L. Lee; Brian J. MacGowan; Robert M. Malone; Edmund W. Ng; Tom W. Tunnell; Phillip W. Watts
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Paper Abstract

The National Ignition Facility (NIF) requires optical diagnostics for measuring shock velocities in shock physics experiments. The velocity interferometer for any reflector measures shock velocities at a location remote to the NIF target chamber. Our team designed two systems, one for a polar port orientation, and the other to accommodate two equatorial ports. The polar-oriented design requires a 48-m optical relay to move the light from inside the target chamber to a separately housed measurement and laser illumination station. The currently operational equatorial design requires a much shorter relay of 21 m. Both designs posed significant optomechanical challenges due to the long optical path length, large quantity of optical elements, and stringent NIF requirements. System design had to tightly control the use of lubricants and materials, especially those inside the vacuum chamber; tolerate earthquakes and radiation; and consider numerous other tolerance, alignment, and steering adjustment issues. To ensure compliance with NIF performance requirements, we conducted a finite element analysis.

Paper Details

Date Published: 5 September 2006
PDF: 11 pages
Proc. SPIE 6289, Novel Optical Systems Design and Optimization IX, 628906 (5 September 2006); doi: 10.1117/12.682172
Show Author Affiliations
Morris I. Kaufman, NSTec (United States)
John R. Celeste, Lawrence Livermore National Lab. (United States)
Brent C. Frogget, NSTec (United States)
Tony L. Lee, Lawrence Livermore National Lab. (United States)
Brian J. MacGowan, Lawrence Livermore National Lab. (United States)
Robert M. Malone, NSTec (United States)
Edmund W. Ng, Lawrence Livermore National Lab. (United States)
Tom W. Tunnell, NSTec (United States)
Phillip W. Watts, NSTec (United States)

Published in SPIE Proceedings Vol. 6289:
Novel Optical Systems Design and Optimization IX
José M. Sasian; Mary G. Turner, Editor(s)

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