Long duration backlighter experiments at Omega

Reighard, A. B.; Glendinning, S. G.; Young, P. E.; Hsing, W. W.; Foord, Mark; Schneider, M.; Lu, K.; Dittrich, Thomas; Wallace, R. J.; Sorce, C.

doi:10.1063/1.2981173

Cited by 12 publications

(3 citation statements)

References 13 publications

(7 reference statements)

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“…The object to be imaged required a high-brightness x-ray source, such that a conventional point-projection radiography scheme could be adopted to make use of all of the available photons. Past efforts have demonstrated that high-resolution images can be obtained using the laser-driven point-backlighting technique [27][28][29][30] and the technique has been employed to dynamically image a Rayleigh-Taylor instability event. 31 The backlighting target employed in the present study comprised three layers.…”

Section: Methodsmentioning

confidence: 99%

Exploration of the fragmentation of laser shock-melted aluminum using x-ray backlighting

Zou

et al. 2016

AIP Advances

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The fragmentation of shock-melted metal material is an important scientific problem in shock physics and is suitable for experimentally investigating by the laser-driven x-ray backlighting technique. This letter reports on the exploration of laser shock-melted aluminum fragmentation by means of x-ray backlighting at the SGII high energy facility in China. High-quality and high-resolution radiographs with negligible motion blur were obtained and these images enabled analysis of the mass distribution of the fragmentation product.

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Section: Methodsmentioning

confidence: 99%

Exploration of the fragmentation of laser shock-melted aluminum using x-ray backlighting

Zou

et al. 2016

AIP Advances

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“…18,19 For PABL, the laser shines on a foil behind a shield with a small pinhole. The pinhole becomes a point source of x rays.…”

Section: Introductionmentioning

confidence: 99%

Development of a Big Area BackLighter for high energy density experiments

Flippo

Kline

Doss

et al. 2014

Review of Scientific Instruments

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A very large area (7.5 mm(2)) laser-driven x-ray backlighter, termed the Big Area BackLighter (BABL) has been developed for the National Ignition Facility (NIF) to support high energy density experiments. The BABL provides an alternative to Pinhole-Apertured point-projection Backlighting (PABL) for a large field of view. This bypasses the challenges for PABL in the equatorial plane of the NIF target chamber where space is limited because of the unconverted laser light that threatens the diagnostic aperture, the backlighter foil, and the pinhole substrate. A transmission experiment using 132 kJ of NIF laser energy at a maximum intensity of 8.52 × 10(14) W/cm(2) illuminating the BABL demonstrated good conversion efficiency of >3.5% into K-shell emission producing ~4.6 kJ of high energy x rays, while yielding high contrast images with a highly uniform background that agree well with 2D simulated spectra and spatial profiles.

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“…Large, homogeneous sources are useful for area backlighters, and very bright sources can be apertured for point-projection backlighters [5][6][7] . High x-ray fluence sources across a range of x-ray energies are needed for studies of x-ray interaction with materials [8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

Multi-keV x-ray source development experiments on the National Ignition Facility

et al. 2010

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We report results from a five shot campaign carried out with Ar-Xe gas-filled targets at the National Ignition Facility (NIF). The targets were shot with ≈ 350 kJ of 3ω laser energy delivered with a 5 ns trapezoidal laser pulse. We report measured x-ray output from the target in different spectral bands both below and above 1.5 keV photon energies: we find yields of ≈20.5 kJ/sr with peak x-ray power approaching 4 TW/sr over all energies, as measured for the unique viewing angle of our detector, and ≈3.6 kJ/sr with peak x-ray power of 1 TW/sr for x rays with energies >3 keV. This is a laser-to-x-ray conversion efficiency of 13±1.3 % for isotropic x rays with energies >3 keV. Laser energy reflected by the target plasma for both inner and outer-cone beams is measured and found to be small, between 1-4% of the drive energy. The energy emitted in hard x rays (with energies >25 keV) is measured and found to be ≈1 J/sr. Two-dimensional imaging of the target plasma during the laser pulse confirms a fast, volumetric heating of the entire target, resulting in efficient laser-to-x-ray conversion. Post-shot simulations with a two-dimensional radiation-hydrodynamics code reproduce well the observed x-ray flux and fluence, backscattered light, and bulk target motion.

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Long duration backlighter experiments at Omega

Cited by 12 publications

References 13 publications

Exploration of the fragmentation of laser shock-melted aluminum using x-ray backlighting

Exploration of the fragmentation of laser shock-melted aluminum using x-ray backlighting

Development of a Big Area BackLighter for high energy density experiments

Multi-keV x-ray source development experiments on the National Ignition Facility

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