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Title: Monte Carlo validation experiments for the gas Cherenkov detectors at the National Ignition Facility and Omega

The gas Cherenkov detectors at NIF and Omega measure several ICF burn characteristics by detecting multi-MeV nuclear γ emissions from the implosion. Of primary interest are γ bang-time (GBT) and burn width defined as the time between initial laser-plasma interaction and peak in the fusion reaction history and the FWHM of the reaction history respectively. To accurately calculate such parameters the collaboration relies on Monte Carlo codes, such as GEANT4 and ACCEPT, for diagnostic properties that cannot be measured directly. This paper describes a series of experiments performed at the High Intensity γ Source (HIγS) facility at Duke University to validate the geometries and material data used in the Monte Carlo simulations. Results published here show that model-driven parameters such as intensity and temporal response can be used with less than 50% uncertainty for all diagnostics and facilities.
Authors:
;  [1] ; ; ; ; ; ; ; ;  [2] ; ;  [3] ;  [4]
  1. Plasma Physics Department, AWE plc, Reading RG7 4PR (United Kingdom)
  2. Plasma Physics Department, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  3. Physics, Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
  4. Photek Limited UK, 26 Castleham Road, St. Leonards-on-sea TN38 9NS (United Kingdom)
Publication Date:
OSTI Identifier:
22220546
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 84; Journal Issue: 7; Other Information: (c) 2013 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CHERENKOV COUNTERS; COMPUTERIZED SIMULATION; HEAVY ION FUSION REACTIONS; LASERS; MEV RANGE; MONTE CARLO METHOD; THERMONUCLEAR REACTIONS; US NATIONAL IGNITION FACILITY; VALIDATION