From Event: SPIE Optical Engineering + Applications, 2016
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.
Richard R. Leach, Abdul A. S. Awwal, Roger Lowe-Webb, Victoria Miller-Kamm, Charles Orth, Randy Roberts, and Karl Wilhelmsen, "Image processing for the Advanced Radiographic Capability (ARC) at the National Ignition Facility," Proc. SPIE 9970, Optics and Photonics for Information Processing X, 99700M (Presented at SPIE Optical Engineering + Applications: August 30, 2016; Published: 14 September 2016); https://doi.org/10.1117/12.2239434.
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