A design of a two-dimensional, supersonic KH experiment on OMEGA-EP

Malamud, G.; Shimony, A.; Wan, Weigang; Stéfano, Carlos Di; Elbaz, D.; Kuranz, Carolyn; Keiter, P. A.; Drake, R. P.; Shvarts, D.

doi:10.1016/j.hedp.2013.06.002

Cited by 22 publications

(17 citation statements)

References 39 publications

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“…In fact, more laser energy allows first launching stronger shocks with high Mach numbers (Ma = u/c where u is the flow velocity and c the speed of sound in the material) in the range of 2-10 [60] . On the other hand, a sustained laser drive will produce steady conditions that endure long enough to observe substantial instability growth, as done on NIF in indirect-drive [10,[36][37][38] , or direct-drive [43] , ablative RTI experiments [10,[36][37][38] as well as shock-shear platform [61,62] and RM-reshock experiments [63] .…”

Section: Experimental Roadmapmentioning

confidence: 99%

Turbulent hydrodynamics experiments in high energy density plasmas: scientific case and preliminary results of the TurboHEDP project

Casner

Rigon

Albertazzi

et al. 2018

High Pow Laser Sci Eng

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The physics of compressible turbulence in high energy density (HED) plasmas is an unchartered experimental area. Simulations of compressible and radiative flows relevant for astrophysics rely mainly on subscale parameters. Therefore, we plan to perform turbulent hydrodynamics experiments in HED plasmas (TurboHEDP) in order to improve our understanding of such important phenomena for interest in both communities: laser plasma physics and astrophysics. We will focus on the physics of supernovae remnants which are complex structures subject to fluid instabilities such as the Rayleigh-Taylor and Kelvin-Helmholtz instabilities. The advent of megajoule laser facilities, like the National Ignition Facility and the Laser Megajoule, creates novel opportunities in laboratory astrophysics, as it provides unique platforms to study turbulent mixing flows in HED plasmas. Indeed, the physics requires accelerating targets over larger distances and longer time periods than previously achieved. In a preparatory phase, scaling from experiments at lower laser energies is used to guarantee the performance of future MJ experiments. This subscale experiments allow us to develop experimental skills and numerical tools in this new field of research, and are stepping stones to achieve our objectives on larger laser facilities. We review first in this paper recent advances in high energy density experiments devoted to laboratory astrophysics. Then we describe the necessary steps forward to commission an experimental platform devoted to turbulent hydrodynamics on a megajoule laser facility. Recent novel experimental results acquired on LULI2000, as well as supporting radiative hydrodynamics simulations, are presented. Together with the development of LiF detectors as transformative X-ray diagnostics, these preliminary results are promising on the way to achieve micrometric spatial resolution in turbulent HED physics experiments in the near future.

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Section: Experimental Roadmapmentioning

confidence: 99%

Turbulent hydrodynamics experiments in high energy density plasmas: scientific case and preliminary results of the TurboHEDP project

Casner

Rigon

Albertazzi

et al. 2018

High Pow Laser Sci Eng

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“…In Fig. 4, the experimental amplitudes were measured in a manner similar to that reported in [43,44], with the caveat that in this case, the aluminum layer is very thick and very opaque. Therefore, in a transmission radiograph, the contour corresponding to the mean Al/foam interface will be at a signal level close to that of the dark Al, and the measurements were made accordingly.…”

Section: Discussionmentioning

confidence: 90%

Evolution of surface structure in laser-preheated perturbed materials

et al. 2017

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We report an experimental and computational study investigating the effects of laser preheat on the hydrodynamic behavior of a material layer. In particular, we find that perturbation of the surface of the layer results in a complex interaction, in which the bulk of the layer develops density, pressure, and temperature structure, and in which the surface experiences instability-like behavior, including mode coupling. A uniform one-temperature preheat model is used to reproduce the experimentallyobserved behavior, and we find that this model can be used to capture the evolution of the layer, while also providing evidence of complexities in the preheat behavior. This result has important consequences for inertially-confined fusion plasmas, which can be difficult to diagnose in detail, as well as for laser hydrodynamics experiments, which generally depend on assumptions about initial conditions in order to interpret their results.

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“…The growth rate for compressible flows [19,20] is for the flow to be supersonic in the usual sense is that M c 0.5). Figure 1 shows the ratio γ/γ ic as a function of A and M c [21]. For the parameters of the experiment, compressible effects are predicted to reduce the smallamplitude growth rate by a factor of 2.…”

mentioning

confidence: 97%

“…The experimental design [21] exploited the long pulses available on Omega EP [22] to create sustained, steady, laser-driven shocks of unprecedented duration. We drove the experiment using three sequential laser beams, each HYADES is a Lagrangian radiation-hydrodynamic code including a laser-absorption model.…”

mentioning

confidence: 99%

“…We processed the radiographic data using an unsharpmask algorithm [10,21] to obtain the interface location, and analyzed the results to infer several quantities of interest, shown in Table I. We determined the shock location for each radiograph by locating the position where the surface of the plastic was deflected downward, and inferred the shock velocity from these observations at various times.…”

mentioning

confidence: 99%

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