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

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.

doi:10.1103/PhysRevLett.123.165001

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

Journal Article · 16 October 2019 · Physical Review Letters

DOI: https://doi.org/10.1103/PhysRevLett.123.165001 · OSTI ID:1571736

Sayre, D. B. ^[1]; Cerjan, C. J. ^[1]; Sepke, S. M. ^[1]; Gericke, D. O. ^[2]; Caggiano, J. A. ^[1]; Divol, L. ^[1]; Eckart, M. J. ^[1]; Graziani, F. R. ^[1]; Grim, G. P. ^[1]; Hansen, S. B. ^[3]; Hartouni, E. P. ^[1]; Hatarik, R. ^[1]; Hatchett, S. P. ^[1]; Hayes, A. K. ^[4]; Hopkins, L. F. Berzak ^[1]; Johnson, M. Gatu ^[5]; Khan, S. F. ^[1]; Knauer, J. P. ^[6]; Le Pape, S. ^[1]; MacKinnon, A. J. ^[1] more »

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Warwick, Coventry (United Kingdom)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Univ. of Rochester, Rochester, NY (United States)

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 k_BT ≈ 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.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1571736

Report Number(s):: LLNL-JRNL--693537; 818980

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 123; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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