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

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

doi:10.1063/1.4935455

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

Journal Article · Sat Nov 14 04:00:00 EST 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4935455· OSTI ID:22492913

Sayre, D. B.; Caggiano, J. A.; Phillips, T.; Eckart, M. J.; Bond, E. J.; Cerjan, C.; Grim, G. P.; Hartouni, E. P.; Mcnaney, J. M.; Munro, D. H. ^[1]; Knauer, J. P. ^[2]

Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States)

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 + {sup 3}He (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{sub ion}) and cold fuel areal density. We report on novel methodologies used to determine neutron yield, apparent T{sub ion}, 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. These methods produce typical uncertainties for DT T{sub 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{sub ion} and 10% for the neutron yield.

OSTI ID:: 22492913

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

Country of Publication:: United States

Language:: English

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

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
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PLASMA
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Analysis of the neutron time-of-flight spectra from inertial confinement fusion experiments

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References (24)

Cited By (31)

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