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18 February 2011 Hohlraum target alignment from x-ray detector images using starburst design patterns
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Proceedings Volume 7916, High Power Lasers for Fusion Research; 791616 (2011) https://doi.org/10.1117/12.878790
Event: SPIE LASE, 2011, San Francisco, California, United States
Abstract
National Ignition Facility (NIF) is a high-energy laser facility comprised of 192 laser beams focused with enough power and precision on a hydrogen-filled spherical, cryogenic target to initiate a fusion reaction. The target container, or hohlraum, must be accurately aligned to an x-ray imaging system to allow careful monitoring of the frozen fuel layer in the target. To achieve alignment, x-ray images are acquired through starburst-shaped windows cut into opposite sides of the hohlraum. When the hohlraum is in alignment, the starburst pattern pairs match nearly exactly and allow a clear view of the ice layer formation on the edge of the target capsule. During the alignment process, x-ray image analysis is applied to determine the direction and magnitude of adjustment required. X-ray detector and source are moved in concert during the alignment process. The automated pointing alignment system described here is both accurate and efficient. In this paper, we describe the control and associated image processing that enables automation of the starburst pointing alignment.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Richard R. Leach Jr., Alan Conder, Oliver Edwards, Jeremy Kroll, Bernard Kozioziemski, Evan Mapoles, Dave McGuigan, and Karl Wilhelmsen "Hohlraum target alignment from x-ray detector images using starburst design patterns", Proc. SPIE 7916, High Power Lasers for Fusion Research, 791616 (18 February 2011); https://doi.org/10.1117/12.878790
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