Alignment mask design and image processing for the Advanced Radiographic Capability (ARC) at the National Ignition Facility

Richard R. Leach Jr.; Abdul Awwal; Simon Cohen; Roger Lowe-Webb; Randy Roberts; Thad Salmon; David Smauley; Karl Wilhelmsen

doi:10.1117/12.2189563

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9 September 2015 Alignment mask design and image processing for the Advanced Radiographic Capability (ARC) at the National Ignition Facility

Richard R. Leach Jr., Abdul Awwal, Simon Cohen, Roger Lowe-Webb, Randy Roberts, Thad Salmon, David Smauley, Karl Wilhelmsen

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Proceedings Volume 9598, Optics and Photonics for Information Processing IX; 959819 (2015) https://doi.org/10.1117/12.2189563
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

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 pulses that generate X-rays which backlight high-density inertial confinement fusion (ICF) targets. ARC is designed to produce multiple, sequential X-ray images by using up to eight back lighters. The images will be used to examine the compression and ignition of a cryogenic deuterium-tritium target with tens-of-picosecond temporal resolution during the critical phases of an ICF shot. Multi-frame, hard-X-ray radiography of imploding NIF capsules is a capability which is critical to the success of NIF's missions. As in the NIF system, ARC requires an optical alignment mask that can be inserted and removed as needed for precise positioning of the beam. Due to ARC’s split beam design, inserting the nominal NIF main laser alignment mask in ARC produced a partial blockage of the mask pattern. Requirements for a new mask design were needed. In this paper we describe the ARC mask requirements, the resulting mask design pattern, and the image analysis algorithms used to detect and identify the beam and reference centers required for ARC alignment.

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Richard R. Leach Jr., Abdul Awwal, Simon Cohen, Roger Lowe-Webb, Randy Roberts, Thad Salmon, David Smauley, and Karl Wilhelmsen "Alignment mask design and image processing for the Advanced Radiographic Capability (ARC) at the National Ignition Facility", Proc. SPIE 9598, Optics and Photonics for Information Processing IX, 959819 (9 September 2015); https://doi.org/10.1117/12.2189563

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