Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session NO08: High Energy Density and Beam Physics
9:30 AM–12:30 PM,
Wednesday, October 19, 2022
Room: 402 ABC
Chair: Valentin Karasiev, LLE
Abstract: NO08.00002 : Characterizing hot electrons in ensemble PIC simulations of high-intensity, laser-plasma interactions with machine learning.*
9:42 AM–9:54 AM
Presenter:
Andre F Antoine
(University of Michigan)
Authors:
Andre F Antoine
(University of Michigan)
Blagoje Z Djordjevic
(Lawrence Livermore National Laboratory)
Tammy Ma
(Lawrence Livermore National Laboratory)
Gerald J Williams
(Lawrence Livermore National Laboratory)
Alexander G Thomas
(University of Michigan)
Derek A Mariscal
(Lawrence Livermore National Laboratory)
In the interaction of high-intensity lasers with over-dense plasmas, the hot electron population dictates system dynamics, driving ion acceleration and x-ray generation, and fast ignition, for example. The primary method for modeling these systems are particle-in-cell simulations (PIC), where macroparticles approximate the kinetics of a distribution of particles. A problem shared with experiments, PIC simulations are inherently noisy given the statistical nature of the algorithm, particularly at lower fidelities. Individual electron energy distributions are easily analyzed with expert examination, but ‘by hand’ analysis is impractical for the hundreds of thousands of case examples produced by ensemble simulations, and this is exacerbated by noisy data. In this work, data from an ensemble of PIC simulations is analyzed and quantified using machine learning (ML) techniques to more reliably extract the hot electron temperature and other physical parameters. We present the dependency of the hot electron temperature and other electron sheath properties on various input parameters such as laser intensity and pulse length across a wide parameter space (~10^18-10^21 W/cm^2, 30-500 fs).
*This work was completed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344 with funding support from the Laboratory Directed Research and Development Program under tracking codes 20-ERD-048, 22-ERR-022, and DOE-SC SCW1722.
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