12 July 2006 Overview of the line-imaging VISAR diagnostic at the National Ignition Facility (NIF)
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Proceedings Volume 6342, International Optical Design Conference 2006; 634220 (2006); doi: 10.1117/12.692236
Event: International Optical Design Conference 2006, 2006, Vancouver, BC, Canada
Abstract
Optical diagnostics are currently being designed to analyze high-energy density physics experiments at the National Ignition Facility (NIF). Two line-imaging Velocity Interferometer System for Any Reflector (VISAR) interferometers have been fielded to measure shock velocities, breakout times, and emission of targets sized from 1 to 5 millimeters. A 20-cm-diameter, fused silica triplet lens collects light at f/3 from the targets inside the 10-meter-diameter NIF vacuum chamber. VISAR recordings use a 659.5-nm probe laser. By adding a specially coated beam splitter at the interferometer table, light at wavelengths from 540 to 645 nm is split into a thermal-imaging diagnostic. Because fused silica lenses are used in the first triplet relay, the intermediate image planes for different wavelengths separate by considerable distances. A pair of corrector lenses on the interferometer table reunites these separated wavelength planes to provide a good image. Streak cameras perform all VISAR and thermal-imaging recording. Alignment techniques are discussed.
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Robert M. Malone, Gene A. Capelle, John R. Celeste, Peter M. Celliers, Brent C. Frogget, Robert L. Guyton, Morris I. Kaufman, Tony L. Lee, Brian J. MacGowan, Edmund W. Ng, Imants P. Reinbachs, Ronald B. Robinson, Lynn G. Seppala, Thomas W. Tunnell, Phillip W. Watts, "Overview of the line-imaging VISAR diagnostic at the National Ignition Facility (NIF)", Proc. SPIE 6342, International Optical Design Conference 2006, 634220 (12 July 2006); doi: 10.1117/12.692236; https://doi.org/10.1117/12.692236
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KEYWORDS
Interferometers

Streak cameras

National Ignition Facility

Diagnostics

Mirrors

Laser beam diagnostics

Relays

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