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DOE OSTI · 3797064

X-ray Imaging Qualifications

Malone, Robert M. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)] (ORCID:0000000161308568)·Castaneda, Jesus J. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)] (ORCID:0009000534398752)·Haines, Todd J. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)] (ORCID:0000000167988453)·Kaufman, Morris I. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)] (ORCID:0009000976908975)·McGillivray, Kevin D. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)] (ORCID:0000000177323754)·Pillow, Jordan A. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)] (ORCID:000900092911884X)·Walters, Katherine L. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)] (ORCID:0009000152646810)·Zepeda-Alarcon, Eloisa [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)] (ORCID:0000000182786075)·Prock, Nichelle L. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)]·Yim, Kevin Y. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)]
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73 NUCLEAR PHYSICS AND RADIATION PHYSICSoptical alignmentoptical designoptical tolerancex-ray radiography

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Malone, Robert M. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)] (ORCID:0000000161308568), Castaneda, Jesus J. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)] (ORCID:0009000534398752), Haines, Todd J. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)] (ORCID:0000000167988453), Kaufman, Morris I. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)] (ORCID:0009000976908975), McGillivray, Kevin D. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)] (ORCID:0000000177323754), Pillow, Jordan A. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)] (ORCID:000900092911884X), Walters, Katherine L. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)] (ORCID:0009000152646810), Zepeda-Alarcon, Eloisa [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)] (ORCID:0000000182786075), Prock, Nichelle L. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)], Yim, Kevin Y. [Nevada National Security Site/Mission Support and Test Services LLC (NNSS/MSTS), North Las Vegas, NV (United States)]. 2026-09-14. X-ray Imaging Qualifications. https://www.osti.gov/biblio/3797064

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DOE OSTI2026

A hybrid Monte Carlo-deterministic second moment method with efficient variance reduction

In this work, we present a hybrid method that combines Monte Carlo with deterministic finite element methods to solve a linear Boltzmann transport equation. Our hybrid method runs orders of magnitude faster than Monte Carlo, without sacrificing accuracy, for a proxy problem from radiative transfer that contains both optically-thick and optically-thin material. We believe that this is the first demonstration of a hybrid Second Moment Method in more than one spatial dimension, the first to consider more than one material, and the first to use variance reduction. Our variance reduction approach arises from an asymptotic analysis in which we show that the magnitude of the scattering source grows without bound. We transform the problem to compute the deviation of the radiation intensity from isotropy. The magnitude of the source in the transformed problem is bounded, and the quality of the hybrid method solution is dramatically improved by a substantial reduction in the variance.

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