10 September 2014 Target material collection for High-Energy Imaging Diagnostic
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Abstract
The National Ignition Facility (NIF) at Lawrence Livermore National Laboratory uses the world’s largest and most energetic laser system to explore Inertial Confinement Fusion (ICF) and High-Energy-Density (HED) physics, with the potential of creating pressure and density conditions normally found in the cores of stars or large planets. During NIF experiments, the laser energy is directed to the target, driving the desired physics conditions, and the breakup of the target. During this breakup there is the potential to generate debris fields with both vaporized and solid target material, traveling at extremely high velocities (~10 km/s). For future shots, it is desirable to minimize distribution of the certain target materials within NIF. The High Energy Imaging Diagnostic (HEIDI), which comes within 8 cm of the target, will be modified to minimize the distribution of the ejected material. An external cone will be added to HEIDI which will block a larger angle than the existing hardware. Internal shielding will be added to isolate target material within the front portion of the diagnostic. A thin aluminum bumper will slow low-density vaporized material and contribute to the breakup of high velocity particles, while a thicker wall will block solid chunks. After the shot, an external cover will be installed, to contain any stray material that might be disturbed by regular operations. The target material will be retrieved from the various shielding mechanisms and assayed.
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Maryum F. Ahmed, James M. Mcnaney, Ryan M. Vignes, Cal A. Smith, Nathan Masters, Chris Bailey, Robert B. Petre, "Target material collection for High-Energy Imaging Diagnostic", Proc. SPIE 9211, Target Diagnostics Physics and Engineering for Inertial Confinement Fusion III, 92110F (10 September 2014); doi: 10.1117/12.2062232; https://doi.org/10.1117/12.2062232
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