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Title: Modeling the one-dimensional imager of neutrons (ODIN) for neutron response functions at the Sandia Z facility

Abstract

The one-dimensional imager of neutrons (ODIN) at the Sandia Z facility consists of a 10-cm block of tungsten with rolled edges, creating a slit imager with slit widths of either 250, 500, or 750 μm. Designed with a 1-m neutron imaging line of sight, we achieve about 4:1 magnification and 500-μm axial spatial resolution. The baseline inertial confinement fusion concept at Sandia is magnetized liner inertial fusion, which nominally creates a 1-cm line source of neutrons. ODIN was designed to determine the size, shape, and location of the neutron producing region, furthering the understanding of compression quality along the cylindrical axis of magnetized liner implosions. Challenges include discriminating neutrons from hard x-rays and gammas with adequate signal-to-noise in the 2 × 10 12 deuterium-deuterium (DD) neutron yield range, as well as understanding the point spread function of the imager to various imaging detectors (namely, CR-39). Modeling efforts were conducted with MCNP6.1 to determine neutron response functions for varying configurations in a clean DD neutron environment (without x-rays or gammas). Configuration alterations that will be shown include rolled-edge slit orientation and slit width, affecting the resolution and response function. The experiment to determine CR-39 neutron sensitivity, with and without a highmore » density polyethylene (n, p) converter, an edge spread function, and resolution will be discussed.« less

Authors:
 [1];  [2]; ORCiD logo [3];  [3]; ORCiD logo [2];  [1];  [2];  [2];  [1];  [2];  [2];  [2];  [2]
  1. Univ. of New Mexico, Albuquerque, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1513161
Alternate Identifier(s):
OSTI ID: 1476839
Report Number(s):
LLNL-JRNL-770778
Journal ID: ISSN 0034-6748; 961145
Grant/Contract Number:  
AC52-07NA27344; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; neutron flux; image processing; Bremsstrahlung; hard X-rays; neutron imaging; image sensors; radiograph

Citation Formats

Vaughan, J. D., Ruiz, C. L., Fittinghoff, D., May, M. J., Ampleford, D. J., Cooper, G. W., Chandler, G. A., Hahn, K., Styron, J. D., McWatters, B. R., Torres, J., Maurer, A. J., and Jones, B. Modeling the one-dimensional imager of neutrons (ODIN) for neutron response functions at the Sandia Z facility. United States: N. p., 2018. Web. doi:10.1063/1.5039366.
Vaughan, J. D., Ruiz, C. L., Fittinghoff, D., May, M. J., Ampleford, D. J., Cooper, G. W., Chandler, G. A., Hahn, K., Styron, J. D., McWatters, B. R., Torres, J., Maurer, A. J., & Jones, B. Modeling the one-dimensional imager of neutrons (ODIN) for neutron response functions at the Sandia Z facility. United States. doi:10.1063/1.5039366.
Vaughan, J. D., Ruiz, C. L., Fittinghoff, D., May, M. J., Ampleford, D. J., Cooper, G. W., Chandler, G. A., Hahn, K., Styron, J. D., McWatters, B. R., Torres, J., Maurer, A. J., and Jones, B. Tue . "Modeling the one-dimensional imager of neutrons (ODIN) for neutron response functions at the Sandia Z facility". United States. doi:10.1063/1.5039366. https://www.osti.gov/servlets/purl/1513161.
@article{osti_1513161,
title = {Modeling the one-dimensional imager of neutrons (ODIN) for neutron response functions at the Sandia Z facility},
author = {Vaughan, J. D. and Ruiz, C. L. and Fittinghoff, D. and May, M. J. and Ampleford, D. J. and Cooper, G. W. and Chandler, G. A. and Hahn, K. and Styron, J. D. and McWatters, B. R. and Torres, J. and Maurer, A. J. and Jones, B.},
abstractNote = {The one-dimensional imager of neutrons (ODIN) at the Sandia Z facility consists of a 10-cm block of tungsten with rolled edges, creating a slit imager with slit widths of either 250, 500, or 750 μm. Designed with a 1-m neutron imaging line of sight, we achieve about 4:1 magnification and 500-μm axial spatial resolution. The baseline inertial confinement fusion concept at Sandia is magnetized liner inertial fusion, which nominally creates a 1-cm line source of neutrons. ODIN was designed to determine the size, shape, and location of the neutron producing region, furthering the understanding of compression quality along the cylindrical axis of magnetized liner implosions. Challenges include discriminating neutrons from hard x-rays and gammas with adequate signal-to-noise in the 2 × 1012 deuterium-deuterium (DD) neutron yield range, as well as understanding the point spread function of the imager to various imaging detectors (namely, CR-39). Modeling efforts were conducted with MCNP6.1 to determine neutron response functions for varying configurations in a clean DD neutron environment (without x-rays or gammas). Configuration alterations that will be shown include rolled-edge slit orientation and slit width, affecting the resolution and response function. The experiment to determine CR-39 neutron sensitivity, with and without a high density polyethylene (n, p) converter, an edge spread function, and resolution will be discussed.},
doi = {10.1063/1.5039366},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {10}
}

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