Study of Scattered Background Neutron in NIF and Time-of Flight (TOF) to Measure Neutron

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Some of the planned core diagnostics for National Ignition Facility (NIF) will use neutron time-of-flight (TOF) spectroscopy techniques to gather information for primary neutron yield measurement or neutron imaging. This technique has been widely and routinely used at other laser facilities including Nova and Omega. TOF methods will also be used to observe target fuel areal density <{rho}R> (radial integral of density) via measuring the number of primary 14.1 MeV neutrons that are down-scattered to lower energies by nuclear collisions inside the compressed target core. The substantially larger target chamber size and higher neutron yield for NIF raises issues related ... continued below

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6 p. (0.3 MB)

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Song, P; Moran, M; Phillips, T; Lerche, R; Koch, J & Eder, D August 31, 2005.

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Some of the planned core diagnostics for National Ignition Facility (NIF) will use neutron time-of-flight (TOF) spectroscopy techniques to gather information for primary neutron yield measurement or neutron imaging. This technique has been widely and routinely used at other laser facilities including Nova and Omega. TOF methods will also be used to observe target fuel areal density <{rho}R> (radial integral of density) via measuring the number of primary 14.1 MeV neutrons that are down-scattered to lower energies by nuclear collisions inside the compressed target core. The substantially larger target chamber size and higher neutron yield for NIF raises issues related to the large number of scattered neutrons produced by high yield deuterium-tritium (D-T) shots at NIF. The effect of primary neutrons scattered by the walls of the massive target chamber and structures both inside and outside the chamber will contribute a significant scattered background signal when trying to determine the number of neutrons down-scattered from the target core. The optimum detector locations outside the target chamber or target bay wall will be proposed. Appropriate collimators at the chamber port and the bay wall (between the neutron source at target chamber center (TCC) and detector) that maximize detection of signal neutrons while minimizing the background from scattered neutrons and neutron induced gamma rays will also be presented.

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6 p. (0.3 MB)

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PDF-file: 6 pages; size: 0.3 Mbytes

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  • Presented at: 2005 Fourth International Conference on Inertial Fusion Sciences and Applications, Biarritz, France, Sep 04 - Sep 09, 2005

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  • Report No.: UCRL-CONF-215021
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 883559
  • Archival Resource Key: ark:/67531/metadc875155

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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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  • August 31, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • April 13, 2017, 6:23 p.m.

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Song, P; Moran, M; Phillips, T; Lerche, R; Koch, J & Eder, D. Study of Scattered Background Neutron in NIF and Time-of Flight (TOF) to Measure Neutron, article, August 31, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc875155/: accessed December 11, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.