Reaction-in-flight neutrons as a test of stopping power in degenerate plasmas

Hayes, A. C.; Jungman, Gerard; Schulz, A. E.; Boswell, M.; Fowler, M. M.; Grim, G.; Klein, A.; Rundberg, R. S.; Wilhelmy, J. B.; Wilson, D.; Cerjan, C.; Schneider, D.; Sepke, S. M.; Tonchev, A.; Yeamans, C.

doi:10.1063/1.4928104

Title: Reaction-in-flight neutrons as a test of stopping power in degenerate plasmas

Journal Article · Thu Aug 06 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4928104· OSTI ID:1234914

Hayes, A. C. ^[1]; Jungman, Gerard ^[1]; Schulz, A. E. ^[1];

^[1]; Fowler, M. M. ^[1]; Grim, G. ^[1]; Klein, A. ^[1];

^[1];

^[1]; Wilson, D. ^[1];

^[2]; Schneider, D. ^[2]; Sepke, S. M. ^[2]; Tonchev, A. ^[2];

^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

We present the first measurements of reaction-in-flight (RIF) neutrons in an inertial confinement fusion system. The experiments were carried out at the National Ignition Facility, using both Low Foot and High Foot drives and cryogenic plastic capsules. In both cases, the high-energy RIF (E_n > 15 MeV) component of the neutron spectrum was found to be about 10^–4 of the total. The majority of the RIF neutrons were produced in the dense cold fuel surrounding the burning hotspot of the capsule, and the data are consistent with a compressed cold fuel that is moderately to strongly coupled (Γ~ 0.6) and electron degenerate (θ_Fermi/θ_e~ 4). The production of RIF neutrons is controlled by the stopping power in the plasma. Thus, the current RIF measurements provide a unique test of stopping power models in an experimentally unexplored plasma regime. In conclusion, we find that the measured RIF data strongly constrain stopping models in warm dense plasma conditions, and some models are ruled out by our analysis of these experiments.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396; Not applicable

OSTI ID:: 1234914

Alternate ID(s):: OSTI ID: 1229577

Report Number(s):: LA-UR-14-29105; PHPAEN

Journal Information:: Physics of Plasmas, Vol. 22, Issue 8; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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References (27)

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A neutron activation spectrometer and neutronic experimental platform for the National Ignition Facility (invited) Yeamans, C. B.; Gharibyan, N. Review of Scientific Instruments, Vol. 87, Issue 11 https://doi.org/10.1063/1.4962871	journal	September 2016
In-flight neutron spectra as an ICF diagnostic for implosion asymmetries Cerjan, C.; Sayre, D. B.; Sepke, S. M. Physics of Plasmas, Vol. 25, Issue 2 https://doi.org/10.1063/1.5018108	journal	February 2018
On alpha-particle transport in inertial fusion Zylstra, A. B.; Hurricane, O. A. Physics of Plasmas, Vol. 26, Issue 6 https://doi.org/10.1063/1.5101074	journal	June 2019
Modified parameterization of the Li-Petrasso charged-particle stopping power theory Zylstra, A. B.; Rinderknecht, H. G.; Frenje, J. A. Physics of Plasmas, Vol. 26, Issue 12 https://doi.org/10.1063/1.5114637	journal	December 2019
Dynamic high energy density plasma environments at the National Ignition Facility for nuclear science research Cerjan, Ch J.; Bernstein, L.; Hopkins, L. Berzak Journal of Physics G: Nuclear and Particle Physics, Vol. 45, Issue 3 https://doi.org/10.1088/1361-6471/aa8693	journal	February 2018
Kinetic physics in ICF: present understanding and future directions Rinderknecht, Hans G.; Amendt, P. A.; Wilks, S. C. Plasma Physics and Controlled Fusion, Vol. 60, Issue 6 https://doi.org/10.1088/1361-6587/aab79f	journal	April 2018
Spectral composition of thermonuclear particle and recoil nuclear emissions from laser fusion targets intended for modern ignition experiments Gus’kov, S. Yu; Il’in, D. V.; Perlado, J. M. Plasma Physics and Controlled Fusion, Vol. 60, Issue 8 https://doi.org/10.1088/1361-6587/aac739	journal	June 2018
Reaction-in-Flight neutrons as a test of stopping power in degenerate plasmas Hayes, A. C.; Cerjan, C. J.; Jungman, G. Journal of Physics: Conference Series, Vol. 717 https://doi.org/10.1088/1742-6596/717/1/012022	journal	May 2016
Measurement of the ${}^{209}{Bi} (n, 4 n) {}^{206}{Bi}$ and ${}^{169}{Tm} (n, 3 n) {}^{167}{Tm}$ cross sections between 23.5 and 30.5 MeV relevant to reaction-in-flight neutron studies at the National Ignition Facility Gooden, M. E.; Bredeweg, T. A.; Champine, B. Physical Review C, Vol. 96, Issue 2 https://doi.org/10.1103/physrevc.96.024622	journal	August 2017
Neutron Time-of-Flight Measurements of Charged-Particle Energy Loss in Inertial Confinement Fusion Plasmas Sayre, D. B.; Cerjan, C. J.; Sepke, S. M. Physical Review Letters, Vol. 123, Issue 16 https://doi.org/10.1103/physrevlett.123.165001	journal	October 2019

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