Bulletin of the American Physical Society
58th Annual Meeting of the APS Division of Plasma Physics
Volume 61, Number 18
Monday–Friday, October 31–November 4 2016; San Jose, California
Session NI2: Stix Award and ICF: Implosion Stagnation
9:30 AM–12:30 PM,
Wednesday, November 2, 2016
Room: 210 CDGH
Chair: Sean Regan, University of Rochester
Abstract ID: BAPS.2016.DPP.NI2.2
Abstract: NI2.00002 : Impact of temperature-velocity distribution on fusion neutron peak shape*
10:00 AM–10:30 AM
Preview Abstract Abstract
(Lawrence Livermore National Laboratory)
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 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 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. This talk 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 radhydro implosion simulations.
*This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2016.DPP.NI2.2
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