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Proceedings Paper

Image processing for the Advanced Radiographic Capability (ARC) at the National Ignition Facility
Author(s): Richard R. Leach; Abdul A. S. Awwal; Roger Lowe-Webb; Victoria Miller-Kamm; Charles Orth; Randy Roberts; Karl Wilhelmsen
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Paper Abstract

The Advance Radiographic Capability (ARC) at the National Ignition Facility (NIF) is a laser system that employs up to four petawatt (PW) lasers to produce a sequence of short-pulse kilo-Joule laser pulses with controllable delays that generate X-rays to provide backlighting for high-density internal confinement fusion (ICF) capsule targets. Multi-frame, hard-X-ray radiography of imploding NIF capsules is a capability which is critical to the success of NIF's missions. ARC is designed to employ up to eight backlighters with tens-of-picosecond temporal resolution, to record the dynamics and produce an X-ray "motion picture" of the compression and ignition of cryogenic deuterium-tritium targets. ARC will generate tens-of-picosecond temporal resolution during the critical phases of ICF shots. Additionally, ARC supports a variety of other high energy density experiments including fast ignition studies on NIF. The automated alignment image analysis algorithms use digital camera sensor images to direct ARC beams onto the tens-of-microns scale metal wires. This paper describes the ARC automatic alignment sequence throughout the laser chain from pulse initiation to target with an emphasis on the image processing algorithms that generate the crucial alignment positions for ARC. The image processing descriptions and flow diagrams detail the alignment control loops throughout the ARC laser chain beginning in the ARC high-contrast front end (HCAFE), on into the ARC main laser area, and ending in the ARC target area.

Paper Details

Date Published: 14 September 2016
PDF: 18 pages
Proc. SPIE 9970, Optics and Photonics for Information Processing X, 99700M (14 September 2016); doi: 10.1117/12.2239434
Show Author Affiliations
Richard R. Leach, Lawrence Livermore National Lab. (United States)
Abdul A. S. Awwal, Lawrence Livermore National Lab. (United States)
Roger Lowe-Webb, Lawrence Livermore National Lab. (United States)
Victoria Miller-Kamm, Lawrence Livermore National Lab. (United States)
Charles Orth, Lawrence Livermore National Lab. (United States)
Randy Roberts, Lawrence Livermore National Lab. (United States)
Karl Wilhelmsen, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 9970:
Optics and Photonics for Information Processing X
Khan M. Iftekharuddin; Abdul A. S. Awwal; Mireya García Vázquez; Andrés Márquez; Mohammad A. Matin, Editor(s)

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