Imaging VISAR diagnostic for the National Ignition Facility (NIF)

Robert M. Malone; John R. Bower; David K. Bradley; Gene A. Capelle; John R. Celeste; Peter M. Celliers; Gilbert W. Collins; Mark J. Eckart; Jon H. Eggert; Brent C. Frogget; Robert L. Guyton; Damien G. Hicks; Morris I. Kaufman; Brian J. MacGowan; Samuel Montelongo; Edmund W. Ng; Ronald B. Robinson; Thomas W. Tunnell; Phillip W. Watts; Paul G. Zapata

doi:10.1117/12.579285

17 March 2005 Imaging VISAR diagnostic for the National Ignition Facility (NIF)

Robert M. Malone, John R. Bower, David K. Bradley, Gene A. Capelle, John R. Celeste, Peter M. Celliers, Gilbert W. Collins, Mark J. Eckart, Jon H. Eggert, Brent C. Frogget, Robert L. Guyton, Damien G. Hicks, Morris I. Kaufman, Brian J. MacGowan, Samuel Montelongo, Edmund W. Ng, Ronald B. Robinson, Thomas W. Tunnell, Phillip W. Watts, Paul G. Zapata

Author Affiliations +

Proceedings Volume 5580, 26th International Congress on High-Speed Photography and Photonics; (2005) https://doi.org/10.1117/12.579285
Event: 26th International Congress on High-Speed Photography and Photonics, 2004, Alexandria, Virginia, United States

Abstract

The National Ignition Facility (NIF) requires diagnostics to analyze high-energy density physics experiments. A VISAR (Velocity Interferometry System for Any Reflector) diagnostic has been designed to measure shock velocities, shock breakout times, and shock emission of targets with sizes from 1 to 5 mm. An 8-inch-diameter fused silica triplet lens collects light at f/3 inside the 30-foot-diameter vacuum chamber. The optical relay sends the image out an equatorial port, through a 2-inch-thick vacuum window, and into two interferometers. A 60-kW VISAR probe laser operates at 659.5 nm with variable pulse width. Special coatings on the mirrors and cutoff filters are used to reject the NIF drive laser wavelengths and to pass a band of wavelengths for VISAR, passive shock breakout light, or thermal imaging light (bypassing the interferometers). 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. The front end of the optical relay can be temporarily removed from the equatorial port, allowing other experimenters to use that port. A unique resolution pattern has been designed to validate the VISAR diagnostic before each use. All optical lenses are on kinematic mounts so that the pointing accuracy of the optical axis can be checked. Seven CCD cameras monitor the diagnostic alignment.

Citation Download Citation

Robert M. Malone, John R. Bower, David K. Bradley, Gene A. Capelle, John R. Celeste, Peter M. Celliers, Gilbert W. Collins, Mark J. Eckart, Jon H. Eggert, Brent C. Frogget, Robert L. Guyton, Damien G. Hicks, Morris I. Kaufman, Brian J. MacGowan, Samuel Montelongo, Edmund W. Ng, Ronald B. Robinson, Thomas W. Tunnell, Phillip W. Watts, and Paul G. Zapata "Imaging VISAR diagnostic for the National Ignition Facility (NIF)", Proc. SPIE 5580, 26th International Congress on High-Speed Photography and Photonics, (17 March 2005); https://doi.org/10.1117/12.579285

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available