Bragg diffraction using a 100 ps 17.5 keV x-ray backlighter and the Bragg diffraction imager

Maddox, Brian; Park, H.-S.; Hawreliak, J.; Elsholz, A.; Maren, R. Van; Remington, B. A.; Comley, A. J.; Wark, J. S.

doi:10.1063/1.3491295

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…In-situ x-ray diffraction was first used to study plasticity in gas gun experiments [1], and was subsequently extended to laser-driven experiments [2][3][4]. Diffraction from single crystals has shown that the material that is initially compressed uniaxially relaxes to a more equiaxed state over a time period that depends on the material.…”

Section: Introductionmentioning

confidence: 99%

Theory and simulation of 1D TO 3D plastic relaxation in tantalum

Rudd

Comley

Hawreliak

et al. 2012

AIP Conference Proceedings

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(2003)Abstract. In plane shockwaves the uniaxial strain rate can greatly exceed the rate at which dislocation flow can relax the concomitant shear stress. The result is an overdriven plastic state in which the compression is 1D uniaxial initially and only after a period of time does the lattice relax to a more 3D compressed state due to plastic flow. Here we use an analytic calculation based on a generalization of the Gilman model of flow involving dislocation evolution to predict the phases of plastic relaxation and to derive an analytic estimate of the relaxation time, including a decomposition into incubation and flow times, suitable for comparison with in-situ x-ray diffraction. We use molecular dynamics (MD) to study the threshold for homogeneous nucleation both in shock compression of single crystal Ta 100 . We find that shock heating on the Hugoniot substantially lowers the threshold pressure for homogeneous nucleation.

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Section: Introductionmentioning

confidence: 99%

Theory and simulation of 1D TO 3D plastic relaxation in tantalum

Rudd

Comley

Hawreliak

et al. 2012

AIP Conference Proceedings

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“…[1][2][3][4][5][6][7][8][9][10][11][12] There are principally two methods for backlit x-ray radiography: area backlighting 13 and Point Projection BackLighting (PPBL). 14,15 For area backlighting, lasers impinging on a high-Z foil generate a source of x rays distributed over the area in which the laser beams hit the target.…”

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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