Advances in Target Design for Heavy-Ion Fusion

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Over the past few years, the emphasis in heavy ion target design has moved from the distributed radiator target to the 'hybrid' target because the hybrid target allows a larger beam focal spot than the distributed radiator ({approx} 5 mm radius rather than {approx} 2 mm radius). The larger spot relaxes some of the requirements on the driver, but introduces some new target physics issues. Most notable is the use of shine shields and shims in the hohlraum to achieve symmetry rather than achieving symmetry by beam placement. The shim is a thin layer of material placed on or near ... continued below

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PDF-file: 19 pages; size: 1.4 Mbytes

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Callahan, D A; Tabak, M; Bennett, G R; Cuneo, M E; Vesey, R A; Nikroo, A et al. June 21, 2005.

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Over the past few years, the emphasis in heavy ion target design has moved from the distributed radiator target to the 'hybrid' target because the hybrid target allows a larger beam focal spot than the distributed radiator ({approx} 5 mm radius rather than {approx} 2 mm radius). The larger spot relaxes some of the requirements on the driver, but introduces some new target physics issues. Most notable is the use of shine shields and shims in the hohlraum to achieve symmetry rather than achieving symmetry by beam placement. The shim is a thin layer of material placed on or near the capsule surface to block a small amount of excess radiation. While we have been developing this technique for the heavy ion hybrid target, the technique can be used in any indirect drive target. We have begun testing the concept of a shim to improve symmetry using a double-ended z-pinch hohlraum on the Sandia Z-machine. Experiments using shimmed thin wall capsules have shown that we can reverse the sign of a P{sub 2} asymmetry and significantly reduce the size of a P{sub 4} asymmetry. These initial experiments demonstrate the concept of a shim as another method for controlling early time asymmetries in ICF capsules.

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PDF-file: 19 pages; size: 1.4 Mbytes

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  • Presented at: 32nd European Physical Society Plasma Physics Conference, Barcelona, Spain, Jun 27 - Jul 01, 2005

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  • Report No.: UCRL-CONF-213139
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 919227
  • Archival Resource Key: ark:/67531/metadc884542

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • June 21, 2005

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 22, 2016, 4:04 p.m.

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Callahan, D A; Tabak, M; Bennett, G R; Cuneo, M E; Vesey, R A; Nikroo, A et al. Advances in Target Design for Heavy-Ion Fusion, article, June 21, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc884542/: accessed December 14, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.