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Title: First D+D neutron image at the National Ignition Facility

First time-integrated neutron images of a deuterium gas filled capsule were obtained using arrival time gating with the Neutron Imaging System at the National Ignition Facility. Images exist from DT (deuterium and tritium mixture) filled capsules in several energy bands but only at the Omega laser had DD (pure deuterium) filled capsules been imaged. A composite image was derived from an assembly of multiple penumbral neutron images using an iterative Maximum Likelihood reconstruction technique. This was compared with a simulated image from a radiation-hydrodynamic calculation. The observed image size, and shape agree, as do the primary DD, secondary DT neutron yields, and the burn duration. However, the observed cross-sectional profiles, although smaller in half width, extend outside the calculated, suggesting that deuterium has mixed outward into the carbon ablator. The observed X-ray image size (61 μm) is larger than the observed neutron image (51 μm). The calculations also reflect this. X-ray brightness includes carbon as well as deuterium emission. A bright spot, “meteor,” in the X-ray image is seen to move in time-gated images, but is not evident in the neutron image. Furthermore, it does not appear to degrade the neutron yield.
Authors:
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  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-748382
Journal ID: ISSN 1070-664X; 933126
Grant/Contract Number:
AC52-07NA27344; AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 6; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1474329
Alternate Identifier(s):
OSTI ID: 1454652

Volegov, P. L., Wilson, D. C., Dewald, E. L., Berzak Hopkins, L. F., Danly, C. R., Fatherley, V. E., Geppert-Kleinrath, V., Merrill, F. E., Simpson, R., Wilde, C. H., Fittinghoff, D. N., Casey, D. T., Grim, G. P., Ayers, M. J., Hatarik, R., Yeamans, C. B., Kruse, M. K. G., Sayre, D. B., Munro, D., Le Pape, S., Izumi, N., and Batha, S. H.. First D+D neutron image at the National Ignition Facility. United States: N. p., Web. doi:10.1063/1.5029836.
Volegov, P. L., Wilson, D. C., Dewald, E. L., Berzak Hopkins, L. F., Danly, C. R., Fatherley, V. E., Geppert-Kleinrath, V., Merrill, F. E., Simpson, R., Wilde, C. H., Fittinghoff, D. N., Casey, D. T., Grim, G. P., Ayers, M. J., Hatarik, R., Yeamans, C. B., Kruse, M. K. G., Sayre, D. B., Munro, D., Le Pape, S., Izumi, N., & Batha, S. H.. First D+D neutron image at the National Ignition Facility. United States. doi:10.1063/1.5029836.
Volegov, P. L., Wilson, D. C., Dewald, E. L., Berzak Hopkins, L. F., Danly, C. R., Fatherley, V. E., Geppert-Kleinrath, V., Merrill, F. E., Simpson, R., Wilde, C. H., Fittinghoff, D. N., Casey, D. T., Grim, G. P., Ayers, M. J., Hatarik, R., Yeamans, C. B., Kruse, M. K. G., Sayre, D. B., Munro, D., Le Pape, S., Izumi, N., and Batha, S. H.. 2018. "First D+D neutron image at the National Ignition Facility". United States. doi:10.1063/1.5029836. https://www.osti.gov/servlets/purl/1474329.
@article{osti_1474329,
title = {First D+D neutron image at the National Ignition Facility},
author = {Volegov, P. L. and Wilson, D. C. and Dewald, E. L. and Berzak Hopkins, L. F. and Danly, C. R. and Fatherley, V. E. and Geppert-Kleinrath, V. and Merrill, F. E. and Simpson, R. and Wilde, C. H. and Fittinghoff, D. N. and Casey, D. T. and Grim, G. P. and Ayers, M. J. and Hatarik, R. and Yeamans, C. B. and Kruse, M. K. G. and Sayre, D. B. and Munro, D. and Le Pape, S. and Izumi, N. and Batha, S. H.},
abstractNote = {First time-integrated neutron images of a deuterium gas filled capsule were obtained using arrival time gating with the Neutron Imaging System at the National Ignition Facility. Images exist from DT (deuterium and tritium mixture) filled capsules in several energy bands but only at the Omega laser had DD (pure deuterium) filled capsules been imaged. A composite image was derived from an assembly of multiple penumbral neutron images using an iterative Maximum Likelihood reconstruction technique. This was compared with a simulated image from a radiation-hydrodynamic calculation. The observed image size, and shape agree, as do the primary DD, secondary DT neutron yields, and the burn duration. However, the observed cross-sectional profiles, although smaller in half width, extend outside the calculated, suggesting that deuterium has mixed outward into the carbon ablator. The observed X-ray image size (61 μm) is larger than the observed neutron image (51 μm). The calculations also reflect this. X-ray brightness includes carbon as well as deuterium emission. A bright spot, “meteor,” in the X-ray image is seen to move in time-gated images, but is not evident in the neutron image. Furthermore, it does not appear to degrade the neutron yield.},
doi = {10.1063/1.5029836},
journal = {Physics of Plasmas},
number = 6,
volume = 25,
place = {United States},
year = {2018},
month = {6}
}