Bulletin of the American Physical Society
60th Annual Meeting of the APS Division of Plasma Physics
Volume 63, Number 11
Monday–Friday, November 5–9, 2018; Portland, Oregon
Session YP11: Poster Session IX: The crossover between high-energy-density plasmas and ultracold neutral plasmas ; Supplemental; Post-Deadline Abstracts (9:30am-12:30pm)
Friday, November 9, 2018
OCC
Room: Exhibit Hall A1&A
Abstract ID: BAPS.2018.DPP.YP11.49
Abstract: YP11.00049 : Performance impacts on direct drive ICF due to beam width*
Presenter:
William Richard Magrogan
(Los Alamos National Laboratory)
Authors:
William Richard Magrogan
(Los Alamos National Laboratory)
Brett Scheiner
(Los Alamos National Laboratory)
Mark Jude Schmitt
(Los Alamos Natl Lab)
In direct drive ICF, beams incident on a spherical target impose a variety of incidence angles across the illumination surface which may be characterized by the beam radius (rb) to target radius (rt). Previous studies [1] examine the effects of the rb/rt ratio on implosion velocity, scattered light fraction, and neutron yield in the rb/rt ~ 1 regime. In this presentation, the impact of the beam radius to target radius on the ablation pressure and the mass ablation rate due to incidence angle spread is explored using radiation hydrodynamic simulations. An analytic expression is derived for the average incidence angle of a beam as a function of the rb/rt ratio. Comparisons of the ablation pressure, mass ablation rate, and scattered light fraction are made with respect to this average incidence angle parameter. Analysis of the effects of beam width may indicate benefits of using narrower beams such as in the Revolver design [2].
[1] D. Froula, et al. Phy. Rev. Lett. 108 125003 (2012)
[2] K. Molvig, et al. Phy. Rev. Lett. 116, 255003 (2016)
*This research was supported by the LANL LDRD program under project number 20180051DR
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DPP.YP11.49
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