Hohlraum Target Alignment from X-ray Detector Images using Starburst Design Patterns

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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 ... continued below

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PDF-file: 13 pages; size: 1.1 Mbytes

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Leach, R R; Conder, A; Edwards, O; Kroll, J; Kozioziemski, B; Mapoles, E et al. December 14, 2010.

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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.

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PDF-file: 13 pages; size: 1.1 Mbytes

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  • Presented at: SPIE Photonics West, San Francisco, CA, United States, Jan 22 - Jan 27, 2011

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  • Report No.: LLNL-CONF-464613
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1018810
  • Archival Resource Key: ark:/67531/metadc840486

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  • December 14, 2010

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  • May 19, 2016, 3:16 p.m.

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  • Nov. 29, 2016, 12:54 p.m.

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Leach, R R; Conder, A; Edwards, O; Kroll, J; Kozioziemski, B; Mapoles, E et al. Hohlraum Target Alignment from X-ray Detector Images using Starburst Design Patterns, article, December 14, 2010; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc840486/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.