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Title: Neutron Time-of-Flight Measurements of Charged-Particle Energy Loss in Inertial Confinement Fusion Plasmas

Abstract

Neutron spectra from secondary 3H(d,n)α reactions produced by an implosion of a deuterium-gas capsule at the National Ignition Facility have been measured with order-of-magnitude improvements in statistics and resolution over past experiments. Furthermore, these new data and their sensitivity to the energy loss of fast tritons emitted from thermal 2H(d,p) 3H reactions enable the first statistically significant investigation of charged-particle stopping via the emitted neutron spectrum. Radiation-hydrodynamic simulations, constrained to match a number of observables from the implosion, were used to predict the neutron spectra while employing two different energy loss models. This analysis represents the first test of stopping models under inertial confinement fusion conditions, covering plasma temperatures of kBT ≈ 1–4 keV and particle densities of n ≈ (12–2) × 10 24 cm –3. Under these conditions, we find significant deviations of our data from a theory employing classical collisions whereas the theory including quantum diffraction agrees with our data.

Authors:
 [1];  [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1];  [3];  [1];  [1];  [1];  [4];  [1];  [5];  [1];  [6];  [1];  [1] more »;  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1] « less
+ Show Author Affiliations
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Warwick, Coventry (United Kingdom)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  6. Univ. of Rochester, Rochester, NY (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1571736
Report Number(s):
LLNL-JRNL-693537
Journal ID: ISSN 0031-9007; PRLTAO; 818980
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 16; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Sayre, D. B., Cerjan, C. J., Sepke, S. M., Gericke, D. O., Caggiano, J. A., Divol, L., Eckart, M. J., Graziani, F. R., Grim, G. P., Hansen, S. B., Hartouni, E. P., Hatarik, R., Hatchett, S. P., Hayes, A. K., Hopkins, L. F. Berzak, Johnson, M. Gatu, Khan, S. F., Knauer, J. P., Le Pape, S., MacKinnon, A. J., McNaney, J. M., Meezan, N. B., Rinderknecht, H. G., Shaughnessy, D. A., Stoeffl, W., Yeamans, C. B., Zylstra, A. B., and Schneider, D. H. Neutron Time-of-Flight Measurements of Charged-Particle Energy Loss in Inertial Confinement Fusion Plasmas. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.123.165001.
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Sayre, D. B., Cerjan, C. J., Sepke, S. M., Gericke, D. O., Caggiano, J. A., Divol, L., Eckart, M. J., Graziani, F. R., Grim, G. P., Hansen, S. B., Hartouni, E. P., Hatarik, R., Hatchett, S. P., Hayes, A. K., Hopkins, L. F. Berzak, Johnson, M. Gatu, Khan, S. F., Knauer, J. P., Le Pape, S., MacKinnon, A. J., McNaney, J. M., Meezan, N. B., Rinderknecht, H. G., Shaughnessy, D. A., Stoeffl, W., Yeamans, C. B., Zylstra, A. B., & Schneider, D. H. Neutron Time-of-Flight Measurements of Charged-Particle Energy Loss in Inertial Confinement Fusion Plasmas. United States. doi:10.1103/PhysRevLett.123.165001.
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Sayre, D. B., Cerjan, C. J., Sepke, S. M., Gericke, D. O., Caggiano, J. A., Divol, L., Eckart, M. J., Graziani, F. R., Grim, G. P., Hansen, S. B., Hartouni, E. P., Hatarik, R., Hatchett, S. P., Hayes, A. K., Hopkins, L. F. Berzak, Johnson, M. Gatu, Khan, S. F., Knauer, J. P., Le Pape, S., MacKinnon, A. J., McNaney, J. M., Meezan, N. B., Rinderknecht, H. G., Shaughnessy, D. A., Stoeffl, W., Yeamans, C. B., Zylstra, A. B., and Schneider, D. H. Thu . "Neutron Time-of-Flight Measurements of Charged-Particle Energy Loss in Inertial Confinement Fusion Plasmas". United States. doi:10.1103/PhysRevLett.123.165001.
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@article{osti_1571736,
title = {Neutron Time-of-Flight Measurements of Charged-Particle Energy Loss in Inertial Confinement Fusion Plasmas},
author = {Sayre, D. B. and Cerjan, C. J. and Sepke, S. M. and Gericke, D. O. and Caggiano, J. A. and Divol, L. and Eckart, M. J. and Graziani, F. R. and Grim, G. P. and Hansen, S. B. and Hartouni, E. P. and Hatarik, R. and Hatchett, S. P. and Hayes, A. K. and Hopkins, L. F. Berzak and Johnson, M. Gatu and Khan, S. F. and Knauer, J. P. and Le Pape, S. and MacKinnon, A. J. and McNaney, J. M. and Meezan, N. B. and Rinderknecht, H. G. and Shaughnessy, D. A. and Stoeffl, W. and Yeamans, C. B. and Zylstra, A. B. and Schneider, D. H.},
abstractNote = {Neutron spectra from secondary 3H(d,n)α reactions produced by an implosion of a deuterium-gas capsule at the National Ignition Facility have been measured with order-of-magnitude improvements in statistics and resolution over past experiments. Furthermore, these new data and their sensitivity to the energy loss of fast tritons emitted from thermal 2H(d,p)3H reactions enable the first statistically significant investigation of charged-particle stopping via the emitted neutron spectrum. Radiation-hydrodynamic simulations, constrained to match a number of observables from the implosion, were used to predict the neutron spectra while employing two different energy loss models. This analysis represents the first test of stopping models under inertial confinement fusion conditions, covering plasma temperatures of kBT ≈ 1–4 keV and particle densities of n ≈ (12–2) × 1024 cm–3. Under these conditions, we find significant deviations of our data from a theory employing classical collisions whereas the theory including quantum diffraction agrees with our data.},
doi = {10.1103/PhysRevLett.123.165001},
journal = {Physical Review Letters},
number = 16,
volume = 123,
place = {United States},
year = {2019},
month = {10}
}
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DOI:  10.1103/PhysRevLett.123.165001
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