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Proceedings Paper

Detecting fiducials affected by trombone delay in ARC and the main laser alignment at the National Ignition Facility
Author(s): Abdul A. S. Awwal; Erlan S. Bliss; Victoria Miller Kamm; Richard R. Leach; Randy Roberts; Michael C. Rushford; Roger Lowe-Webb; Karl Wilhelmsen
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Paper Abstract

Four of the 192 beams of the National Ignition Facility (NIF) are currently being diverted into the Advanced Radiographic Capability (ARC) system to generate a sequence of short (1-50 picoseconds) 1053 nm laser pulses. When focused onto high Z wires in vacuum, these pulses create high energy x-ray pulses capable of penetrating the dense, imploding fusion fuel plasma during ignition scale experiments. The transmitted x-rays imaged with x-ray diagnostics can create movie radiographs that are expected to provide unprecedented insight into the implosion dynamics. The resulting images will serve as a diagnostic for tuning the experimental parameters towards successful fusion reactions. Beam delays introduced into the ARC pulses via independent, free-space optical trombones create the desired x-ray image sequence, or movie. However, these beam delays cause optical distortion of various alignment fiducials viewed by alignment sensors in the NIF and ARC beamlines. This work describes how the position of circular alignment fiducials is estimated in the presence of distortion.

Paper Details

Date Published: 9 September 2015
PDF: 11 pages
Proc. SPIE 9598, Optics and Photonics for Information Processing IX, 959812 (9 September 2015); doi: 10.1117/12.2190065
Show Author Affiliations
Abdul A. S. Awwal, Lawrence Livermore National Lab. (United States)
Erlan S. Bliss, Lawrence Livermore National Lab. (United States)
Victoria Miller Kamm, Lawrence Livermore National Lab. (United States)
Richard R. Leach, Lawrence Livermore National Lab. (United States)
Randy Roberts, Lawrence Livermore National Lab. (United States)
Michael C. Rushford, Lawrence Livermore National Lab. (United States)
Roger Lowe-Webb, Lawrence Livermore National Lab. (United States)
Karl Wilhelmsen, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 9598:
Optics and Photonics for Information Processing IX
Abdul A. S. Awwal; Khan M. Iftekharuddin; Mohammad A. Matin; Mireya García Vázquez; Andrés Márquez, Editor(s)

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