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Hill MP, Williams GJ, Kalantar DH, Bachmann B, Martinez DA, Stan CV, Murphy A, Arend MJ, Mercado GA, Wong HC, Dunn Z, Santos CD, Lockard TE, Gumbrell ET, Rudd RE, McNaney JM, Le Galloudec KK, Remington BA, Park HS. Characterization of a 1D-imaging high-energy x-ray backlighter driven by the National Ignition Facility Advanced Radiographic Capability laser. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:103506. [PMID: 36319395 DOI: 10.1063/5.0101886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 09/01/2022] [Indexed: 06/16/2023]
Abstract
Plastic deformation of samples compressed to Mbar pressures at high strain rates at the National Ignition Facility (NIF) forms the basis of ongoing material strength experiments in conditions relevant to meteor impacts, geophysics, armor development, and inertial confinement fusion. Hard x-ray radiography is the primary means of measuring the evolution of these samples, typically employing a slit-collimated high-Z microdot driven by the NIF laser to generate >40 keV x rays [E. Gumbrell et al., Rev. Sci. Instrum. 89, 10G118 (2018) and C. M. Huntington et al., Rev. Sci. Instrum. 89, 10G121 (2018)]. Alternatively, a dysprosium "micro-flag" target driven by the Advanced Radiographic Capability laser (∼2 kJ, 10 ps) can deliver significantly higher spatiotemporal resolution [M. P. Hill et al., Rev. Sci. Instrum. 92, 033535 (2021)], especially in high-opacity samples. Initial experiments revealed problematic brightness and spectral gradients from this source, but by radiographing a set of diamond-turned, 105 µm-thick Pb test objects and supported by simulations using the 3D Monte Carlo code GEANT4, these geometry-dependent gradients across the field of view are quantified and mitigation strategies are assessed. In addition to significantly enhancing the modulation transfer function compared to the existing system, image stacking from multiple layers of image plate is shown to almost double the signal to noise ratio that will reduce uncertainties in future dynamic strength experiments.
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Affiliation(s)
- M P Hill
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - G J Williams
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - D H Kalantar
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - B Bachmann
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - D A Martinez
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - C V Stan
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - A Murphy
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - M J Arend
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - G A Mercado
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - H C Wong
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - Z Dunn
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - C D Santos
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - T E Lockard
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | | | - R E Rudd
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - J M McNaney
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - K K Le Galloudec
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - B A Remington
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
| | - H-S Park
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, USA
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Hohenberger M, Kerr S, Yeamans C, Rusby D, Meaney KD, Hahn K, Heredia R, Sarginson T, Blue B, Mackinnon AJ, Hsing WW. A combined MeV-neutron and x-ray source for the National Ignition Facility. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:103510. [PMID: 36319336 DOI: 10.1063/5.0101816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 08/11/2022] [Indexed: 06/16/2023]
Abstract
In support of future radiation-effects testing, a combined environment source has been developed for the National Ignition Facility (NIF), utilizing both NIF's long-pulse beams, and the Advanced Radiographic Capability (ARC) short pulse lasers. First, ARC was used to illuminate a gold foil at high-intensity, generating a significant x-ray signal >1 MeV. This was followed by NIF 10 ns later to implode an exploding pusher target filled with fusionable gas for neutron generation. The neutron and x-ray bursts were incident onto a retrievable, close-standoff diagnostic snout. With separate control over both neutron and x-ray emission, the platform allows for tailored photon and neutron fluences and timing on a recoverable test sample. The platform exceeded its initial fluence goals, demonstrating a neutron fluence of 2.3 ×1013 n/cm2 and an x-ray dose of 7 krad.
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Affiliation(s)
- M Hohenberger
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - S Kerr
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - C Yeamans
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - D Rusby
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - K D Meaney
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - K Hahn
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - R Heredia
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - T Sarginson
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - B Blue
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - A J Mackinnon
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
| | - W W Hsing
- Lawrence Livermore National Laboratory, Livermore, California 94550, USA
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Moody JD, Pollock BB, Sio H, Strozzi DJ, Ho DDM, Walsh C, Kemp GE, Kucheyev SO, Kozioziemski B, Carroll EG, Kroll J, Yanagisawa DK, Angus J, Bhandarkar SD, Bude JD, Divol L, Ferguson B, Fry J, Hagler L, Hartouni E, Herrmann MC, Hsing W, Holunga DM, Javedani J, Johnson A, Kalantar D, Kohut T, Logan BG, Masters N, Nikroo A, Orsi N, Piston K, Provencher C, Rowe A, Sater J, Skulina K, Stygar WA, Tang V, Winters SE, Chittenden JP, Appelbe B, Boxall A, Crilly A, O’Neill S, Davies J, Peebles J, Fujioka S. The Magnetized Indirect Drive Project on the National Ignition Facility. JOURNAL OF FUSION ENERGY 2022. [DOI: 10.1007/s10894-022-00319-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Hill MP, Williams GJ, Zylstra AB, Stan CV, Lockard TE, Gumbrell ET, Rudd RE, Powell PD, Swift DC, McNaney JM, Le Galloudec KK, Remington BA, Park HS. High resolution >40 keV x-ray radiography using an edge-on micro-flag backlighter at NIF-ARC. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2021; 92:033535. [PMID: 33820053 DOI: 10.1063/5.0043783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 02/26/2021] [Indexed: 06/12/2023]
Abstract
Radiography of low-contrast features in high-density materials evolving on a nanosecond timescale requires a bright photon source in the tens of keV range with high temporal and spatial resolution. One application for sources in this category is the study of dynamic material strength in samples compressed to Mbar pressures at the National Ignition Facility, high-resolution measurements of plastic deformation under conditions relevant to meteor impacts, geophysics, armor development, and inertial confinement fusion. We present radiographic data and the modulation transfer function (MTF) analysis of a multi-component test object probed at ∼100 keV effective backlighter energy using a 5 μm-thin dysprosium foil driven by the NIF Advanced Radiographic Capability (ARC) short-pulse laser (∼2 kJ, 10 ps). The thin edge of the foil acts as a bright line-projection source of hard x rays, which images the test object at 13.2× magnification into a filtered and shielded image plate detector stack. The system demonstrates a superior contrast of shallow (5 μm amplitude) sinusoidal ripples on gold samples up to 90 μm thick as well as enhanced spatial and temporal resolution using only a small fraction of the laser energy compared to an existing long-pulse-driven backlighter used routinely at the NIF for dynamic strength experiments.
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Affiliation(s)
- M P Hill
- AWE Plc, Aldermaston RG7 4PR, United Kingdom
| | - G J Williams
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore California 94550, USA
| | - A B Zylstra
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore California 94550, USA
| | - C V Stan
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore California 94550, USA
| | - T E Lockard
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore California 94550, USA
| | | | - R E Rudd
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore California 94550, USA
| | - P D Powell
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore California 94550, USA
| | - D C Swift
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore California 94550, USA
| | - J M McNaney
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore California 94550, USA
| | - K K Le Galloudec
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore California 94550, USA
| | - B A Remington
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore California 94550, USA
| | - H-S Park
- Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore California 94550, USA
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