Analysis of the neutron time-of-flight spectra from inertial confinement fusion experiments

Hatarik, R.; Sayre, D. B.; Caggiano, J. A.; Phillips, T.; Eckart, M. J.; Bond, E. J.; Cerjan, C.; Grim, G. P.; Hartouni, E. P.; Knauer, J. P.; Mcnaney, J. M.; Munro, D. H.

doi:10.1063/1.4935455

Title: Analysis of the neutron time-of-flight spectra from inertial confinement fusion experiments

Journal Article · Thu Nov 12 00:00:00 EST 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4935455· OSTI ID:1240967

Hatarik, R. ^[1]; Sayre, D. B. ^[1]; Caggiano, J. A. ^[1];

^[1]; Eckart, M. J. ^[1]; Bond, E. J. ^[1];

^[1]; Grim, G. P. ^[1];

^[1]; Knauer, J. P. ^[2]; Mcnaney, J. M. ^[1];

^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Neutron time-of-flight diagnostics have long been used to characterize the neutron spectrum produced by inertial confinement fusion experiments. The primary diagnostic goals are to extract the d+t → n+α (DT) and d+d→ n+³He (DD) neutron yields and peak widths, and the amount DT scattering relative to its unscattered yield, also known as the down-scatter ratio (DSR). These quantities are used to infer yield weighted plasma conditions, such as ion temperature (T_ion) and cold fuel areal density. We report on novel methodologies used to determine neutron yield, apparent Tion, and DSR. These methods invoke a single temperature, static fluid model to describe the neutron peaks from DD and DT reactions and a spline description of the DT spectrum to determine the DSR. Both measurements are performed using a forward modeling technique that includes corrections for line-of-sight attenuation and impulse response of the detection system. Lastly, these methods produce typical uncertainties for DT T_ion of 250 eV, 7% for DSR, and 9% for the DT neutron yield. For the DD values, the uncertainties are 290 eV for T_ion and 10% for the neutron yield.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1240967

Alternate ID(s):: OSTI ID: 1225817; OSTI ID: 1341985

Report Number(s):: LLNL-JRNL-675169; LLNL-JRNL-686422; JAPIAU

Journal Information:: Journal of Applied Physics, Vol. 118, Issue 18; ISSN 0021-8979

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

Country of Publication:: United States

Language:: English

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Cited by: 86 works

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