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Proceedings Paper

Hohlraum target alignment from x-ray detector images using starburst design patterns
Author(s): Richard R. Leach; Alan Conder; Oliver Edwards; Jeremy Kroll; Bernard Kozioziemski; Evan Mapoles; Dave McGuigan; Karl Wilhelmsen
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Paper 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.

Paper Details

Date Published: 18 February 2011
PDF: 11 pages
Proc. SPIE 7916, High Power Lasers for Fusion Research, 791616 (18 February 2011); doi: 10.1117/12.878790
Show Author Affiliations
Richard R. Leach, Lawrence Livermore National Lab. (United States)
Alan Conder, Lawrence Livermore National Lab. (United States)
Oliver Edwards, Lawrence Livermore National Lab. (United States)
Jeremy Kroll, Lawrence Livermore National Lab. (United States)
Bernard Kozioziemski, Lawrence Livermore National Lab. (United States)
Evan Mapoles, Lawrence Livermore National Lab. (United States)
Dave McGuigan, Lawrence Livermore National Lab. (United States)
Karl Wilhelmsen, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 7916:
High Power Lasers for Fusion Research
Abdul A. S. Awwal; A. Mike Dunne; Hiroshi Azechi; Brian E. Kruschwitz, Editor(s)

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