Conceptual design of the gamma-to-electron magnetic spectrometer for the National Ignition Facility [electronic resource].
- Washington, D.C. : United States. Dept. of Energy, 2014. and Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
- Physical Description:
- Article numbers 11E122 : digital, PDF file
- Additional Creators:
- Lawrence Livermore National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
- Restrictions on Access:
- Free-to-read Unrestricted online access
- The Gamma-to-Electron Magnetic Spectrometer (GEMS) diagnostic is designed to measure the prompt γ-ray energy spectrum during high yield deuterium-tritium (DT) implosions at the National Ignition Facility (NIF). The prompt γ-ray spectrum will provide ‘burn-averaged’ observables, including total DT fusion yield, total areal density (ρR), ablator ρR, and fuel ρR. These burn-averaged observables are unique because they are essentially averaged over 4π, providing a global reference for the line-of-sight-specific measurements typical of x-ray and neutron diagnostics. The GEMS conceptual design meets the physics-based requirements: ΔE/E = 3 - 5% can be achieved in the range of 2 - 25 MeV γ-ray energy. Minimum DT neutron yields required for 15% measurement uncertainty at low-resolution mode are: 5×1014 DT-n for ablator ρR (at 0.2 g/cm2); 2×1015 DT-n for total DT yield (at 4.2×10-5γ /n); and 1×1016 DT-n for fuel ρR (at 1 g/cm2).
- Published through SciTech Connect., 08/01/2014., "llnl--jrnl-741517", Review of Scientific Instruments 85 11 ISSN 0034-6748 AM, and Y. Kim; H. W. Herrmann; H. J. Jorgenson; D. B. Barlow; C. S. Young; W. Stoeffl; D. Casey; T. Clancy; F. E. Lopez; J. A. Oertel; T. Hilsabeck; K. Moy; S. H. Batha.
- Funding Information:
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