Dr. Steve A. Payne Profile

Dr. Steve A. Payne

Distinguished Member of the Technical Staff at Lawrence Livermore National Lab

SPIE Involvement:

Fellows Committee | Conference Program Committee | Author | Editor

Publications (92)

Proceedings Article | 4 October 2024 Presentation

Bismuth-loaded plastic scintillators

Sean O'Neal, Nerine Cherepy, Saphon Hok, Steve Payne, Charles Hurlbut

Proceedings Volume PC13151, PC1315104 (2024) https://doi.org/10.1117/12.3029881

KEYWORDS: Plastics, Scintillators, Spectroscopy, Sensors, Materials properties, Gamma radiation, Energy efficiency, Detector development, Bismuth

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Proceedings Article | 10 June 2024 Presentation

Transparent ceramic gain media

Steve Payne, Nerine Cherepy, Ross Osborne, Thomas Rudzik, Alexander Drobshoff, Zachary Seeley, Timothy Yee, Tyler Wineger, Raymond Beach, Jun Zhang, Mark Dubinskii

Proceedings Volume PC13029, PC130290A (2024) https://doi.org/10.1117/12.3018945

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Proceedings Article | 7 June 2024 Presentation + Paper

Self Q-switched Nd, Cr:YAG transparent ceramics

Ross Osborne, Alexander Drobshoff, Nerine Cherepy, Raymond Beach, Stephen Payne

Proceedings Volume 13029, 1302905 (2024) https://doi.org/10.1117/12.3019086

KEYWORDS: Chromium, Neodymium, Annealing, Rod lasers, Ceramics, Absorption, Q switched lasers, Q switching, Nd:YAG lasers, Diodes

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Proceedings Article | 4 October 2023 Presentation

High resolution lens-coupled MeV x-radiography of dense additively manufactured objects

Nerine Cherepy, Daniel Schneberk, Zachary Seeley, Colby McNamee, Stephen Payne, Paul Carriere, Robert Berry, Jarvis Caffrey

Proceedings Volume PC12696, PC1269606 (2023) https://doi.org/10.1117/12.2680643

KEYWORDS: Inspection, Additive manufacturing, Metals, Spatial resolution, Scintillators, X-rays, X-ray computed tomography, Imaging systems, Cameras, Amorphous silicon

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Additive manufacturing techniques are being extended to refractory metals and other metals capable of operating in high-temperature environments. Many of these metals are high-Z and high density necessitating higher x-ray inspection energies. 3D volumetric X-ray computed tomography (X-ray CT) has emerged as a strategic inspection choice for these parts. The internal channels and features of these parts are often complicated and can articulate in spiral configurations for longer chord lengths that are difficult to inspect in a single or ensemble of radiographs. In particular, it is the entire 3D structure of the part that is of interest not just one or two locations in the volume. At the same time, 3D printing is extending the spatial resolution limits for small, manufactured details and defects, which impacts the target resolution. CT inspection requirements for these parts include resolution down to 0.1 mm at MeV energies. In this context, properties of the GLO transparent ceramic scintillator (Gd0.3Lu1.6Eu0.1O3): high-stopping power, high-brightness, high transparency in large area plates combined to produce high intrinsic spatial resolution, could be pivotal for delivering 3D inspections of these parts. Radiabeam LLC has configured an area-detector CT camera-scintillator system employing GLO (other scintillators have been used in this system) in combination with the ARCIS LINAC (adjustable from 2-9 MeV). A variety of AM-fabricated refractory metal components have been scanned at 7.8 MeV, providing robust transmitted signal for high density parts with 2-3” chord lengths, in parts that are up to 6 inches in diameter. Lens-coupled X-ray CT using a transparent scintillator imaged on a sCMOS camera obtains higher spatial resolution than the more commonly employed phosphor-enhanced amorphous silicon (A-Si) panels. The result is higher contrast imaging due to increased stopping power. Interior features of the additively manufactured components have been resolved down to a voxel size of 80 microns. Inspection data from this system with representative AM parts will be reviewed and evaluated.

Proceedings Article | 4 October 2023 Presentation

Large volume bismuth-loaded plastics for portal monitors

Sean O'Neal, Saphon Hok, Nerine Cherepy, Stephen Payne, Charles Hurlbut

Proceedings Volume PC12696, PC126960C (2023) https://doi.org/10.1117/12.2682491

KEYWORDS: Plastics, Scintillators, Bismuth

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Proceedings Article | 3 October 2023 Presentation + Paper

Improved gamma imaging at NIF using the ceramic scintillator GYGAG

M. Rubery, D. Fittinghoff, N. Cherepy, C. Danly, V. Geppert-Kleinrath, V. Fatherley, H. Jorgenson, M. Freeman, C. Wilde, P. Volegov, M. Durocher, G. Saavedra, A. Moore, D. Schlossberg, E. Casco, S. Payne, R. Osborne, Z. Seeley, C. McNamee, C. Waltz

Proceedings Volume 12696, 1269605 (2023) https://doi.org/10.1117/12.2682629

KEYWORDS: Scintillators, National Ignition Facility, Imaging systems, Gamma ray imaging, Cameras, Spatial resolution, Point spread functions, Ceramics, Tungsten, Relays

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Proceedings Article | 3 October 2023 Presentation + Paper

Direct fabrication of pixelated detector arrays for high-energy x-ray imaging via additive manufacturing

Joshua Smith, Ross Osborne, Timothy Yee, Colby McNamee, Phillip Kerr, Nerine Cherepy, Zachary Seeley, Stephen Payne

Proceedings Volume 12696, 1269609 (2023) https://doi.org/10.1117/12.2689039

KEYWORDS: X-ray imaging, Additive manufacturing, Printing, Reflectors, X-rays, Ceramics, Scintillators, Detector arrays, Sintering, Imaging arrays

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Proceedings Article | 15 June 2023 Presentation + Paper

Single-step fabrication of transparent SrF2 ceramics for optical applications

Thomas Rudzik, Zachary Seeley, Nerine Cherepy, Stephen Payne

Proceedings Volume 12515, 125150B (2023) https://doi.org/10.1117/12.2661729

KEYWORDS: Ceramics, Particles, Fluoride, Depolarization, Porosity, Optical transmission, Laser scattering, Fabrication, Photomicroscopy, Sintering

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Proceedings Article | 15 June 2023 Presentation

Transparent ceramic laser media fabricated via additive manufacturing

Ross Osborne, Ian Phillips, Nerine Cherepy, Alexander Drobshoff, Stephen Payne, Mark Dubinskii

Proceedings Volume PC12515, PC125150A (2023) https://doi.org/10.1117/12.2664173

KEYWORDS: Additive manufacturing, Ceramics, Laser manufacturing, Doping, Nanoparticles, Ions, YAG lasers, Waveguides, Rod lasers, Laser development

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Proceedings Article | 4 October 2022 Presentation + Paper

Large transparent ceramic garnet scintillator module

N. J. Cherepy, S. P. O'Neal, R. A. Osborne, T. J. Wineger, Z. M. Seeley, C. J. McNamee, S. A. Payne, F. Liang, H. Brands, L. Hoy, J. Verity, A. Jackson, D. Hook, L. Ruthardt, W. Johnson, T. Zhang, T. Stefanik

Proceedings Volume 12241, 1224105 (2022) https://doi.org/10.1117/12.2634325

KEYWORDS: Ceramics, Scintillators, Spectroscopy, Sensors, Garnet

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Proceedings Article | 3 October 2022 Presentation

Advantages of bismuth loaded plastic scintillators (Conference Presentation)

Sean O'Neal, Nerine Cherepy, Saphon Hok, Robert Sanner, Steven Payne

Proceedings Volume PC12241, PC1224107 (2022) https://doi.org/10.1117/12.2635289

KEYWORDS: Scintillators, Bismuth, Spectroscopy, Sensors, Environmental sensing

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Proceedings Article | 1 September 2021 Presentation + Paper

Lens-coupled MeV x-radiography and CT with transparent ceramic GLO scintillators

N. Cherepy, Z. Seeley, D. Schneberk, C. McNamee, C. Pincus, T. Rudzik, R. Osborne, I. Phillips, J. Nicolino, J. Hall, A. Townsend, S. Payne

Proceedings Volume 11838, 118380P (2021) https://doi.org/10.1117/12.2595956

KEYWORDS: Scintillators, Radiography, Aluminum, Ceramics, X-rays, X-ray computed tomography, Cameras, Tungsten, Copper, Spatial resolution

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Proceedings Article | 5 August 2021 Presentation

High-light yield bismuth-loaded plastic scintillators

Sean O'Neal, Nerine Cherepy, Saphon Hok, Stephen Payne

Proceedings Volume 11838, 1183808 (2021) https://doi.org/10.1117/12.2596144

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Proceedings Article | 4 August 2021 Presentation

Pixelated dual module GYGAG directional gamma spectrometer

Erik Swanberg, Sean O'Neal, Nerine Cherepy, Zachary Seeley, Stephen Payne, Joel Kindem

Proceedings Volume 11838, 1183809 (2021) https://doi.org/10.1117/12.2596159

KEYWORDS: Spectroscopy, Scintillators, Sensors, Photodiodes, Microcontrollers, Image resolution, Garnet, Ceramics

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Proceedings Article | 19 April 2021 Presentation

3D printed ceramic laser gain media

Zachary Seeley, Nerine Cherepy, Thomas Rudzik, Ian Phillips, Alexander Drobshoff, Timothy Yee, Oscar Herrera, Fredrick Ryerson, Tyler Wineger, Yimin Wang, Mike Squillante, Mark Dubinskiy, Stephen Payne

Proceedings Volume 11724, 117240B (2021) https://doi.org/10.1117/12.2589593

KEYWORDS: Laser optics, Ceramics, Nonimpact printing, Integrated optics, Doping, Printing, Laser development, Ions, Geometrical optics, Control systems

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Proceedings Article | 17 September 2020 Presentation + Paper

Scintillators and detectors for MeV x-ray and neutron imaging

N. Cherepy, Z. Seeley, S. Hok, D. Schneberk, P. Kerr, S. O'Neal, I. Oksuz, M. Bisbee, L. Cao, S. Payne, R. Sanner, G. Stone, B. Hobson, G. Guethlein, J. Hall, R. Stoneking, J. Mintz, C. McNamee, P. Thelin

Proceedings Volume 11494, 114940N (2020) https://doi.org/10.1117/12.2569519

KEYWORDS: Scintillators, X-rays, Radiography, X-ray imaging, Amorphous silicon, Ceramics, Spatial resolution

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