Impact of temperature-velocity distribution on fusion neutron peak shape

Munro, D. H.; Field, J. E.; Hatarik, R.; Peterson, J. L.; Hartouni, E. P.; Spears, B. K.; Kilkenny, J. D.

doi:10.1063/1.4976857

Title: Impact of temperature-velocity distribution on fusion neutron peak shape

Journal Article · Tue Feb 21 00:00:00 EST 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4976857· OSTI ID:1345328

^[1]; Field, J. E. ^[1]; Hatarik, R. ^[1];

^[1];

^[1]; Spears, B. K. ^[1]; Kilkenny, J. D. ^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
General Atomics, San Diego, CA (United States)

Doppler broadening of the 14 MeV DT and 2.45 MeV DD fusion neutron lines has long been our best measure of temperature in a burning plasma. At the National Ignition Facility (NIF), yields are high enough and our neutron spectrometers accurate enough that we see finer details of the peak shape. For example, we can measure the shift of the peak due to the bulk motion of the plasma, and we see indications of non-thermal broadening, skew, and kurtosis of the peak caused by the variations of temperature and fluid velocity during burn. We can also distinguish spectral differences among several lines of sight. Finally, this paper will review the theory of fusion neutron line shape, show examples of non-Gaussian line shapes and directional variations in NIF data, and describe detailed spectral shapes we see in radiation-hydrodynamics simulations of implosions.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344; NA0001808

OSTI ID:: 1345328

Alternate ID(s):: OSTI ID: 1348022

Report Number(s):: LLNL-JRNL-708813; TRN: US1700697

Journal Information:: Physics of Plasmas, Vol. 24, Issue 5; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 22 works

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A near one-dimensional indirectly driven implosion at convergence ratio 30 MacLaren, S. A.; Masse, L. P.; Czajka, C. E. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5017976	journal	May 2018
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
Synthetic nuclear diagnostics for inferring plasma properties of inertial confinement fusion implosions Crilly, A. J.; Appelbe, B. D.; McGlinchey, K. Physics of Plasmas, Vol. 25, Issue 12 https://doi.org/10.1063/1.5027462	journal	December 2018
Calibration of a neutron time-of-flight detector with a rapid instrument response function for measurements of bulk fluid motion on OMEGA Mannion, O. M.; Glebov, V. Yu.; Forrest, C. J. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5037324	journal	October 2018
Using a 2-shock 1D platform at NIF to measure the effect of convergence on mix and symmetry Kyrala, G. A.; Pino, J. E.; Khan, S. F. Physics of Plasmas, Vol. 25, Issue 10 https://doi.org/10.1063/1.5038570	journal	October 2018
A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited) Moore, A. S.; Schlossberg, D. J.; Hartouni, E. P. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5039322	journal	October 2018
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
Nuclear diagnostics for Inertial Confinement Fusion (ICF) plasmas Frenje, J. A. Plasma Physics and Controlled Fusion, Vol. 62, Issue 2 https://doi.org/10.1088/1361-6587/ab5137	journal	January 2020

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