Gamma Reaction History for the NIF

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Bang time and reaction history measurements are fundamental components of diagnosing ICF implosions and will be essential contributors to diagnosing attempts at ignition on the National Ignition Facility (NIF). Fusion gammas provide a direct measure of fusion interaction rate without being compromised by Doppler spreading. Gamma-based gas Cherenkov detectors that convert fusion gamma rays to optical Cherenkov photons for collection by fast recording systems have been developed and fielded at Omega. These systems have established their usefulness in illuminating ICF physics in several experimental campaigns. Bang time precision better than 25 ps has been demonstrated, well below the 50 ps ... continued below

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Herrmann, H W; Evans, S C; Kim, Y; Mack, J M; Young, C S; Cox, B C et al. June 5, 2009.

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Bang time and reaction history measurements are fundamental components of diagnosing ICF implosions and will be essential contributors to diagnosing attempts at ignition on the National Ignition Facility (NIF). Fusion gammas provide a direct measure of fusion interaction rate without being compromised by Doppler spreading. Gamma-based gas Cherenkov detectors that convert fusion gamma rays to optical Cherenkov photons for collection by fast recording systems have been developed and fielded at Omega. These systems have established their usefulness in illuminating ICF physics in several experimental campaigns. Bang time precision better than 25 ps has been demonstrated, well below the 50 ps accuracy requirement defined by the NIF System Design Requirements. A staged approach of implementing Gamma Reaction History (GRH) diagnostics on the NIF has been initiated. In the early stage, multiple detectors located close to target chamber center (at 2 and 6 m) and coupled to photomultiplier tubes are geared toward the loweryield THD campaign. In the later stage, streak camera–coupled instruments will be used for improved temporal resolution at the higher yields expected from the DT ignition campaign. Multiple detectors will allow for increased dynamic range and gamma energy spectral information.

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  • 36th International Conference on Plasma Science (ICOPS) and 23rd Symposium on Fusion Engineering (SOFE); San Diego, California; May 31-June 5, 2009

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  • Report No.: DOE/NV/25946--629
  • Grant Number: DE-AC52-06NA25946
  • Office of Scientific & Technical Information Report Number: 960386
  • Archival Resource Key: ark:/67531/metadc930918

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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.

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  • June 5, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Feb. 20, 2017, 2:07 p.m.

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Herrmann, H W; Evans, S C; Kim, Y; Mack, J M; Young, C S; Cox, B C et al. Gamma Reaction History for the NIF, article, June 5, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc930918/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.