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Title: The magnetic recoil spectrometer for measurements of the absolute neutron spectrum at OMEGA and the NIF

The neutron spectrum produced by deuterium-tritium (DT) inertial confinement fusion implosions contains a wealth of information about implosion performance including the DT yield, iontemperature, and areal-density. The Magnetic Recoil Spectrometer (MRS) has been used at both the OMEGA laser facility and the National Ignition Facility (NIF) to measure the absolute neutron spectrum from 3 to 30 MeV at OMEGA and 3 to 36 MeV at the NIF. These measurements have been used to diagnose the performance of cryogenic target implosions to unprecedented accuracy. Interpretation of MRS data requires a detailed understanding of the MRS response and background. This paper describes ab initio characterization of the system involving Monte Carlo simulations of the MRS response in addition to the commission experiments for in situ calibration of the systems on OMEGA and the NIF.
Authors:
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  1. MIT, Cambridge, MA (United States). Plasma Science and Fusion Center
  2. Univ. of Rochester, NY (United States). Lab. for Laser Energitics
  3. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  4. Sandia National Laboratories, Albuquerque, NM (United States)
  5. State Univ. of New York at Geneseo, NY (United States)
  6. General Atomics, San Diego, CA (United States)
Publication Date:
OSTI Identifier:
1172369
Grant/Contract Number:
NA0002035
Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 84; Journal Issue: 4; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Research Org:
Massachusetts Institute of Technology (MIT), Cambridge, MA (United States). High Energy Density Physics Div., Plasma Science and Fusion Center
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY