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

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.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1234914

Alternate ID(s):: OSTI ID: 1229577

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

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

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

Country of Publication:: United States

Language:: English

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