Development of a short duration backlit pinhole for radiography on the National Ignition Facility

Huntington, C. M.; Krauland, C.; Kuranz, Carolyn; Drake, R. P.; Park, H.-S.; Kalantar, D. H.; Maddox, Brian; Remington, B. A.; Kline, J. L.

doi:10.1063/1.3496984

Cited by 21 publications

(7 citation statements)

References 17 publications

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“…Intense ultrashort bursts of x-ray radiation are essential for backlighting the implosion of capsules in inertial confinement fusion experiments [1,2]. They are also of significant interest for fundamental studies that include laboratory opacity measurements in matter at the conditions of stellar interiors [3], and for probing ultrafast changes in material with high spatial and temporal resolution [4,5].…”

Section: Introductionmentioning

confidence: 99%

Efficient picosecond x-ray pulse generation from plasmas in the radiation dominated regime

Hollinger¹,

Bargsten²,

Shlyaptsev³

et al. 2017

Optica

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The efficient conversion of optical laser light into bright ultrafast x-ray pulses in laser created plasmas is of high interest for dense plasma physics studies, material science, and other fields. However, the rapid hydrodynamic expansion that cools hot plasmas has limited the x-ray conversion efficiency (CE) to 1% or less. Here we demonstrate more than one order of magnitude increase in picosecond x-ray CE by tailoring near solid density plasmas to achieve a large radiative to hydrodynamic energy loss rate ratio, leading into a radiation loss dominated plasma regime. A record 20% CE into hν > 1 keV photons was measured in arrays of large aspect ratio Au nanowires heated to keV temperatures with ultrahigh contrast femtosecond laser pulses of relativistic intensity. The potential of these bright ultrafast x-ray point sources for table-top imaging is illustrated with single shot flash radiographs obtained using low laser pulse energy. These results will enable the deployment of brighter laser driven x-ray sources at both compact and large laser facilities.

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Section: Introductionmentioning

confidence: 99%

Efficient picosecond x-ray pulse generation from plasmas in the radiation dominated regime

Hollinger¹,

Bargsten²,

Shlyaptsev³

et al. 2017

Optica

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“…In another test experiment, a high-yield backlighter signal was demonstrated using 8 NIF beams (Huntington et al 2010). A vanadium foil mounted on a tantalum substrate with a pinhole aperture of 20 µm was used.…”

Section: Experimental Methods and Demonstration Experimentsmentioning

confidence: 99%

Astrophysically relevant radiation hydrodynamics experiment at the National Ignition Facility

Kuranz

Park

Remington

et al. 2011

Astrophys Space Sci

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The National Ignition Facility (NIF) is capable of creating new and novel high-energy-density (HED) systems relevant to astrophysics. Specifically, a system could be created that studies the effects of a radiative shock on a hydrodynamically unstable interface. These dynamics would be relevant to the early evolution after a core-collapse supernova of a red supergiant star. Prior to NIF, no HED facility had enough energy to perform this kind of experiment. The experimental target will include a 340 µm predominantly plastic ablator followed by a low-density SiO 2 foam. The interface will have a specific, machined pattern that will seed hydrodynamic instabilities. The growth of the instabilities in a radiation-dominated environment will be observed. This experiment requires a ≥300 eV hohlraum drive and

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“…Due to the small size of the slit, we worked diligently to ensure our backlighter had sufficient energy to provide us with enough photons to perform our experiments. If we assume 4.5 kJ of energy from the backlighter beams with 0.35% conversion efficiency into 5.2 keV V x-rays [23], we can expect 10 16 total photons emitted into 4𝜋. A slit with dimensions of 1 𝜇m × 30 𝜇m located 5 mm away transmits ∼10 11 photons, resulting in 200 photons incident on a 1 𝜇m × 1 𝜇m element of the wire.…”

Section: Facility Configurationmentioning

confidence: 99%

Towards an integrated platform for characterizing laser-driven, isochorically-heated plasmas with 1-$μ$m spatial resolution

Allen,

Oliver,

Divol

et al. 2021

Preprint

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Warm dense matter is a region of phase space that is of high interest to multiple scientific communities ranging from astrophysics to inertial confinement fusion. Further understanding of the conditions and properties of this complex state of matter necessitates experimental benchmarking of the current theoretical models. Benchmarking of transport properties like conductivity and diffusivity has been scarce because they are small and slow processes that require micron-level resolution to see. We discuss development of a radiography platform designed to allow for measurement of these properties at large laser facilities such as the OMEGA Laser.

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Development of a short duration backlit pinhole for radiography on the National Ignition Facility

Cited by 21 publications

References 17 publications

Efficient picosecond x-ray pulse generation from plasmas in the radiation dominated regime

Efficient picosecond x-ray pulse generation from plasmas in the radiation dominated regime

Astrophysically relevant radiation hydrodynamics experiment at the National Ignition Facility

Towards an integrated platform for characterizing laser-driven, isochorically-heated plasmas with 1-$μ$m spatial resolution

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