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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 8 — Mar. 10, 2011
  • pp: 1136–1157

National Ignition Facility system alignment

S. C. Burkhart, E. Bliss, P. Di Nicola, D. Kalantar, R. Lowe-Webb, T. McCarville, D. Nelson, T. Salmon, T. Schindler, J. Villanueva, and K. Wilhelmsen  »View Author Affiliations


Applied Optics, Vol. 50, Issue 8, pp. 1136-1157 (2011)
http://dx.doi.org/10.1364/AO.50.001136


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Abstract

The National Ignition Facility (NIF) is the world’s largest optical instrument, comprising 192 37 cm square beams, each generating up to 9.6 kJ of 351 nm laser light in a 20 ns beam precisely tailored in time and spectrum. The Facility houses a massive ( 10 m diameter) target chamber within which the beams converge onto an 1 cm size target for the purpose of creating the conditions needed for deuterium/tritium nuclear fusion in a laboratory setting. A formidable challenge was building NIF to the precise requirements for beam propagation, commissioning the beam lines, and engineering systems to reliably and safely align 192 beams within the confines of a multihour shot cycle. Designing the facility to minimize drift and vibration, placing the optical components in their design locations, commissioning beam alignment, and performing precise system alignment are the key alignment accomplishments over the decade of work described herein. The design and positioning phases placed more than 3000 large ( 2.5 m × 2 m × 1 m ) line-replaceable optics assemblies to within ± 1 mm of design requirement. The commissioning and alignment phases validated clear apertures (no clipping) for all beam lines, and demonstrated automated laser alignment within 10 min and alignment to target chamber center within 44 min . Pointing validation system shots to flat gold-plated x-ray emitting targets showed NIF met its design requirement of ± 50 μm rms beam pointing to target chamber. Finally, this paper describes the major alignment challenges faced by the NIF Project from inception to present, and how these challenges were met and solved by the NIF design and commissioning teams.

© 2011 Optical Society of America

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(140.3530) Lasers and laser optics : Lasers, neodymium
(220.1140) Optical design and fabrication : Alignment

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: August 30, 2010
Revised Manuscript: November 19, 2010
Manuscript Accepted: November 23, 2010
Published: March 8, 2011

Citation
S. C. Burkhart, E. Bliss, P. Di Nicola, D. Kalantar, R. Lowe-Webb, T. McCarville, D. Nelson, T. Salmon, T. Schindler, J. Villanueva, and K. Wilhelmsen, "National Ignition Facility system alignment," Appl. Opt. 50, 1136-1157 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-8-1136


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