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Title: Fielding of an Imaging VISAR Diagnostic at the National Ignition Facility (NIF)

Abstract

The National Ignition Facility (NIF) requires diagnostics to analyze high-energy density physics experiments. As a core NIF early light diagnostic, this system measures shock velocities, shock breakout times, and shock emission of targets with sizes from 1 to 5 mm. A 659.5 nm VISAR probe laser illuminates the target. An 8-inch-diameter fused silica triplet lens collects light at f/3 inside the 33-foot-diameter vacuum chamber. The optical relay sends the image out an equatorial port, through a 2-inch-thick vacuum window, and into two VISAR (Velocity Interferometer System for Any Reflector) interferometers. Both streak cameras and CCD cameras record the images. Total track is 75 feet. The front end of the optical relay can be temporarily removed from the equatorial port, allowing for other experimenters to use that port. The first triplet can be no closer than 500 mm from the target chamber center and is protected from debris by a blast window that is replaced after every event. Along with special coatings on the mirrors, cutoff filters reject the NIF drive laser wavelengths and pass a band of wavelengths for VISAR, for passive shock breakout light, or for thermal imaging light (bypassing the interferometers). Finite Element Analysis was performed on allmore » mounting structures. All optical lenses are on kinematic mounts, so that the pointing accuracy of the optical axis can be checked. A two-color laser alignment scheme is discussed.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
15014425
Report Number(s):
UCRL-CONF-205549
Journal ID: ISSN 0277-786X; TRN: US200601%%373
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Journal Volume: 5523; Conference: Presented at: SPIE International Symposium Optical Science and Technology, Denver, CO, United States, Aug 02 - Aug 06, 2004
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; ACCURACY; ALIGNMENT; CAMERAS; COATINGS; INTERFEROMETERS; LASERS; LENSES; MIRRORS; PHYSICS; PROBES; SILICA; STREAK CAMERAS; TARGET CHAMBERS; TARGETS; TRIPLETS; VELOCITY; WAVELENGTHS; WINDOWS

Citation Formats

Malone, R, Bower, J, Capelle, G, Celeste, J, Celliers, P, Frogget, B C, Guyton, R L, Kauffman, M, Lare, G, Lee, T, MacGowan, B, Montelongo, S, Thomas, T, Tunnell, T, and Watts, P. Fielding of an Imaging VISAR Diagnostic at the National Ignition Facility (NIF). United States: N. p., 2004. Web. doi:10.1117/12.561773.
Malone, R, Bower, J, Capelle, G, Celeste, J, Celliers, P, Frogget, B C, Guyton, R L, Kauffman, M, Lare, G, Lee, T, MacGowan, B, Montelongo, S, Thomas, T, Tunnell, T, & Watts, P. Fielding of an Imaging VISAR Diagnostic at the National Ignition Facility (NIF). United States. https://doi.org/10.1117/12.561773
Malone, R, Bower, J, Capelle, G, Celeste, J, Celliers, P, Frogget, B C, Guyton, R L, Kauffman, M, Lare, G, Lee, T, MacGowan, B, Montelongo, S, Thomas, T, Tunnell, T, and Watts, P. 2004. "Fielding of an Imaging VISAR Diagnostic at the National Ignition Facility (NIF)". United States. https://doi.org/10.1117/12.561773. https://www.osti.gov/servlets/purl/15014425.
@article{osti_15014425,
title = {Fielding of an Imaging VISAR Diagnostic at the National Ignition Facility (NIF)},
author = {Malone, R and Bower, J and Capelle, G and Celeste, J and Celliers, P and Frogget, B C and Guyton, R L and Kauffman, M and Lare, G and Lee, T and MacGowan, B and Montelongo, S and Thomas, T and Tunnell, T and Watts, P},
abstractNote = {The National Ignition Facility (NIF) requires diagnostics to analyze high-energy density physics experiments. As a core NIF early light diagnostic, this system measures shock velocities, shock breakout times, and shock emission of targets with sizes from 1 to 5 mm. A 659.5 nm VISAR probe laser illuminates the target. An 8-inch-diameter fused silica triplet lens collects light at f/3 inside the 33-foot-diameter vacuum chamber. The optical relay sends the image out an equatorial port, through a 2-inch-thick vacuum window, and into two VISAR (Velocity Interferometer System for Any Reflector) interferometers. Both streak cameras and CCD cameras record the images. Total track is 75 feet. The front end of the optical relay can be temporarily removed from the equatorial port, allowing for other experimenters to use that port. The first triplet can be no closer than 500 mm from the target chamber center and is protected from debris by a blast window that is replaced after every event. Along with special coatings on the mirrors, cutoff filters reject the NIF drive laser wavelengths and pass a band of wavelengths for VISAR, for passive shock breakout light, or for thermal imaging light (bypassing the interferometers). Finite Element Analysis was performed on all mounting structures. All optical lenses are on kinematic mounts, so that the pointing accuracy of the optical axis can be checked. A two-color laser alignment scheme is discussed.},
doi = {10.1117/12.561773},
url = {https://www.osti.gov/biblio/15014425}, journal = {},
issn = {0277-786X},
number = ,
volume = 5523,
place = {United States},
year = {Wed Jun 30 00:00:00 EDT 2004},
month = {Wed Jun 30 00:00:00 EDT 2004}
}

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