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 GO06: ICF: Measurement and Diagnostic Techniques
9:30 AM–12:30 PM,
Tuesday, October 18, 2022
Room: Ballroom 111 C
Chair: Roberto Mancini, University of Nevada, Reno
Abstract: GO06.00006 : Direct inversion of deflectometry data using an electrostatic plasma model*
10:30 AM–10:42 AM
Presenter:
Jonathan R Davies
(University of Rochester)
Authors:
Jonathan R Davies
(University of Rochester)
Peter V Heuer
(Laboratory for Laser Energetics)
Archie F Bott
(Princeton University)
Laboratory for Laser Energetics, Rochester, NY
A. F. A. Bott
Princeton University, Princeton, NJ
Deflectometry encompasses charged particle radiography and shadowgraphy. We propose a new method for the direct inversion of deflectometry data using an electrostatic plasma model, and compare it to a new Monge-Ampère code and an existing power-diagram code. The measured and source intensities are represented by fixed ions and mobile electrons subject to drag. The displacement of the electrons at equilibrium determines the path-integrated transverse deflection force. The decrease in energy provides a measure of convergence. We have implemented two approaches: PIC (particle in cell) and Lagrangian fluid. A series of test cases were run to validate and compare the algorithms. Only the PIC code obtained a solution to every case. The Monge--Ampère code was by far the fastest, but failed to converge for strong modulations. The power-diagram code was by far the slowest and failed to obtain a solution in cases with large peaks in the measured intensity, but was more accurate than the other codes for a test with a mesh placed between the source and the object.
*This material is based upon work supported by the Department of Energy National Nuclear Security Administration under Award Number DE-NA0003856.
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