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Proceedings Paper

Near field intensity trends of main laser alignment images in the National Ignition Facility (NIF)
Author(s): Richard R. Leach Jr.; Ilona Beltsar; Scott Burkhart; Roger Lowe-Webb; Victoria Miller-Kamm; Thad Salmon; Karl Wilhelmsen
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Paper Abstract

The National Ignition Facility (NIF) utilizes 192 high-energy laser beams focused with enough power and precision on a hydrogen-filled spherical, cryogenic target to potentially initiate a fusion reaction. NIF has been operational for six years and during that time, thousands of successful laser firings or shots have been executed. Critical instrument measurements and camera images are carefully recorded for each shot. The result is a massive and complex database or ‘big data’ archive that can be used to investigate the state of the laser system at any point in its history or to locate and track trends in the laser operation over time. In this study, the optical light throughput for more than 1600 NIF shots for each of the 192 main laser beams and 48 quads was measured over a three year period from January 2009 to October 2012. The purpose was to verify that the variation in the transmission of light through the optics performed within design expectations during this time period. Differences between average or integrated intensity from images recorded by the input sensor package (ISP) and by the output sensor package (OSP) in the NIF beam-line were examined. A metric is described for quantifying changes in the integrated intensity measurements. Changes in light transmission from the NIF main laser over the three year time-frame are presented.

Paper Details

Date Published: 26 February 2015
PDF: 12 pages
Proc. SPIE 9345, High Power Lasers for Fusion Research III, 93450D (26 February 2015); doi: 10.1117/12.2084006
Show Author Affiliations
Richard R. Leach Jr., Lawrence Livermore National Lab. (United States)
Ilona Beltsar, Lawrence Livermore National Lab. (United States)
Scott Burkhart, Lawrence Livermore National Lab. (United States)
Roger Lowe-Webb, Lawrence Livermore National Lab. (United States)
Victoria Miller-Kamm, Lawrence Livermore National Lab. (United States)
Thad Salmon, Lawrence Livermore National Lab. (United States)
Karl Wilhelmsen, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 9345:
High Power Lasers for Fusion Research III
Abdul A. S. Awwal; Monya A. Lane, Editor(s)

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