Quantification of MagLIF morphology using the Mallat scattering transformation

Glinsky, Michael E.; Moore, Thomas W.; Lewis, William E.; Weis, Matthew R.; Jennings, Christopher A.; Ampleford, David J.; Knapp, Patrick F.; Harding, Eric C.; Gomez, Matthew R.; Harvey-Thompson, Adam J.

doi:10.1063/5.0010781

Quantification of MagLIF morphology using the Mallat scattering transformation

Journal Article · Mon Nov 02 23:00:00 EST 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0010781· OSTI ID:1698192

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The morphology of the stagnated plasma resulting from magnetized liner inertial fusion is measured by imaging the self-emission x rays coming from the multi-keV plasma. Equivalent diagnostic responses can be generated by integrated radiation-magnetohydrodynamic (rad-MHD) simulations from programs such as HYDRA and GORGON. There have been only limited quantitative ways to compare the image morphology, that is the texture, of simulations and experiments. We have developed a metric of image morphology based on the Mallat scattering transformation (MST), a transformation that has proved to be effective at distinguishing textures, sounds, and written characters. This metric is designed, demonstrated, and refined by classifying ensembles (i.e., classes) of synthetic stagnation images and by regressing an ensemble of synthetic stagnation images to the morphology (i.e., model) parameters used to generate the synthetic images. We use this metric to quantitatively compare simulations to experimental images, experimental images to each other, and to estimate the morphological parameters of the experimental images with uncertainty. This coordinate space has proved to be very adept at doing a sophisticated relative background subtraction in the MST space. This was needed to compare the experimental self-emission images to the rad-MHD simulation images.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: NA0003525

OSTI ID:: 1698192

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 11 Vol. 27; ISSN 1070-664X

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

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