Development of a Big Area BackLighter for high energy density experiments

Flippo, K. A.; Kline, J. L.; Doss, F. W.; Loomis, Eric; Emerich, M.; DeVolder, B.G.; Murphy, T. J.; Fournier, K. B.; Kalantar, D. H.; Regan, S. P.; Barrios, M. A.; Merritt, Elizabeth; Perry, T. S.; Tregillis, I. L.; Welser‐Sherrill, L.; Fincke, J. R.

doi:10.1063/1.4893349

Cited by 35 publications

(6 citation statements)

References 35 publications

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“…This source is used to create X-ray radiographs (see Fig. 1c, d ), giving us a 2D image of the structure produced by instability growth 13 . Additional target and diagnostic details can be found in Supplementary Note 1 .…”

Section: Resultsmentioning

confidence: 99%

How high energy fluxes may affect Rayleigh–Taylor instability growth in young supernova remnants

et al. 2018

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Energy-transport effects can alter the structure that develops as a supernova evolves into a supernova remnant. The Rayleigh–Taylor instability is thought to produce structure at the interface between the stellar ejecta and the circumstellar matter, based on simple models and hydrodynamic simulations. Here we report experimental results from the National Ignition Facility to explore how large energy fluxes, which are present in supernovae, affect this structure. We observed a reduction in Rayleigh–Taylor growth. In analyzing the comparison with supernova SN1993J, a Type II supernova, we found that the energy fluxes produced by heat conduction appear to be larger than the radiative energy fluxes, and large enough to have dramatic consequences. No reported astrophysical simulations have included radiation and heat conduction self-consistently in modeling supernova remnants and these dynamics should be noted in the understanding of young supernova remnants.

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Section: Resultsmentioning

confidence: 99%

How high energy fluxes may affect Rayleigh–Taylor instability growth in young supernova remnants

et al. 2018

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“…Previous NIF experiments, while well-characterized and having obtained the highest Signal-to-Noise ratio (SNR) image of any laser-driven, single-mode HED instability to date, were not optimized for resolution [6]. Figure 1 shows data obtained from the campaign conducted in 2017 [6] using big-areabacklighter (BABL) scheme developed by Flippo et al [23]. The spatial resolution of the system in figure 1 (right) is ≈ 28 μm, mainly set by the 25 μm pinhole diameter [23].…”

Section: Radiography Diagnosticmentioning

confidence: 99%

Design of a high-resolution Rayleigh-Taylor experiment with the Crystal Backlighter Imager on the National Ignition Facility

et al. 2022

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The Rayleigh-Taylor (RT) instability affects a vast range of High Energy Density (HED) length scales, spanning from supernova explosions (1013 m) to inertial confinement fusion (10-6 m). In inertial confinement fusion, the RT instability is known to induce mixing or turbulent transition, which in turn cools the hot spot and hinders ignition. The fine-scale features of the RT instability, which are difficult to image in HED physics, may help determine if the system is mixing or is transitioning to turbulence. Earlier diagnostics lacked the spatial and temporal resolution necessary to diagnose the dynamics that occur along the RT structure. A recently developed diagnostic, the Crystal Backlighter Imager (CBI), [1,2] can now produce an x-ray radiograph capable of resolving the fine-scale features expected in these RT unstable systems. This paper describes an experimental design that adapts a well-characterized National Ignition Facility (NIF) platform to accommodate the CBI diagnostic. Simulations and synthetic radiographs highlight the resolution capabilities of the CBI in comparison to previous diagnostics. The improved resolution of the system can provide new observations to study the RT instability's involvement in mixing and the transition to turbulence in the HED regime.

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“…The cameras integrate over 100 ps. More data on the specific diagnostic scheme implemented here is available in Flippo et al [62]. In the early versions of this experiment, the shock tube was made of dense plastic, but has since been replaced by beryllium for its superior x-ray transparency.…”

Section: Experimental Designmentioning

confidence: 99%

Observation and analysis of emergent coherent structures in a high-energy-density shock-driven planar mixing layer experiment

2016

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Coherent emergent structures have been observed in a high-energy-density supersonic mixing layer experiment. A millimeter-scale shock tube uses lasers to drive Mbar shocks into the tube volume. The shocks are driven into initially solid foam (60 mg/cm^{3}) hemicylinders separated by an Al or Ti metal tracer strip; the components are vaporized by the drive. Before the experiment disassembles, the shocks cross at the tube center, creating a very fast (ΔU> 200 km/s) shear-unstable zone. After several nanoseconds, an expanding mixing layer is measured, and after 10+ ns we observe the appearance of streamwise-periodic, spanwise-aligned rollers associated with the primary Kelvin-Helmholtz instability of mixing layers. We additionally image roller pairing and spanwise-periodic streamwise-aligned filaments associated with secondary instabilities. New closures are derived to connect length scales of these structures to estimates of fluctuating velocity data otherwise unobtainable in the high-energy-density environment. This analysis indicates shear-induced specific turbulent energies 10^{3}-10^{4} times higher than the nearest conventional experiments. Because of difficulties in continuously driving systems under these conditions and the harshness of the experimental environment limiting the usable diagnostics, clear evidence of these developing structures has never before been observed in this regime.

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Development of a Big Area BackLighter for high energy density experiments

Cited by 35 publications

References 35 publications

How high energy fluxes may affect Rayleigh–Taylor instability growth in young supernova remnants

How high energy fluxes may affect Rayleigh–Taylor instability growth in young supernova remnants

Design of a high-resolution Rayleigh-Taylor experiment with the Crystal Backlighter Imager on the National Ignition Facility

Observation and analysis of emergent coherent structures in a high-energy-density shock-driven planar mixing layer experiment

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