The study of high-speed surface dynamics using a pulsed proton beam

Buttler, W. T.; Oró, D.; Preston, Dean L.; Mikaelian, Karnig O.; Cherne, F. J.; Hixson, R. S.; Mariam, Fesseha; Morris, C. L.; Stone, Joseph B.; Terrones, Guillermo; Tupa, D.

doi:10.1063/1.3686446

Cited by 25 publications

(21 citation statements)

References 10 publications

(13 reference statements)

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“…Although these models have not been tested at extreme pressures, it is interesting to see how our results compare with their conclusions (and since no data exist at extreme regimes, our results may even form a first data basis for the validation of ejecta models at high pressure). We use in particular the model developed in the study of Buttler et al [19]. In this study, the asymptotic limit V limit of bubble velocity as a function of time t derives from the Mikaelian's model [35]: V limit = 2/(3kt) (on late times, it is independent of the initial perturbation amplitudes); and the maximum velocity attainable by the spikes is ).…”

Section: The Continuum Point Of Viewmentioning

confidence: 99%

“…In this study, the asymptotic limit V limit of bubble velocity as a function of time t derives from the Mikaelian's model [35]: V limit = 2/(3kt) (on late times, it is independent of the initial perturbation amplitudes); and the maximum velocity attainable by the spikes is ). This expression includes portions of Mikaelian's model [35] with linear [36] and nonlinear [19] corrections.…”

Section: The Continuum Point Of Viewmentioning

confidence: 99%

“…From these studies, is now well admitted that the phenomenon is a limiting case of Richtmyer-Meshkov instabilities (RMIs) [1,[19][20].…”

Section: Introductionmentioning

confidence: 99%

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Mass-velocity and size-velocity distributions of ejecta cloud from shock-loaded tin surface using atomistic simulations

Durand

Soulard

2015

Journal of Applied Physics

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Abstract:The mass (volume and areal densities) versus velocity as well as the size versus velocity distributions of a shock-induced cloud of particles are investigated using large scale molecular dynamics (MD) simulations. A generic three-dimensional tin crystal with a sinusoidal free surface roughness (single wavelength) is set in contact with vacuum and shock-loaded so that it melts directly on shock. At the reflection of the shock wave onto the perturbations of the free surface, two-dimensional sheets/jets of liquid metal are ejected. The simulations show that the distributions may be described by an analytical model based on the propagation of a fragmentation zone, from the tip of the sheets to the free surface, within which the kinetic energy of the atoms decreases as this zone comes closer to the free surface on late times. As this kinetic energy drives (i) the (self-similar) expansion of the zone once it has broken away from the sheet and (ii) the average size of the particles which result from fragmentation in the zone, the ejected mass and the average size of the particles progressively increase in the cloud as fragmentation occurs closer to the free surface.Though relative to nanometric scales, our model may help in the analysis of experimental profiles.2

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Section: The Continuum Point Of Viewmentioning

confidence: 99%

Section: The Continuum Point Of Viewmentioning

confidence: 99%

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Mass-velocity and size-velocity distributions of ejecta cloud from shock-loaded tin surface using atomistic simulations

Durand

Soulard

2015

Journal of Applied Physics

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“…The present decade has seen the application of proton radiography to study RM unstable phenomena, and ejecta studies began to focus more on RMI physics and RMI ejecta models; research on RMI models is now extensively reported [39][40][41][42].…”

Section: Smentioning

confidence: 99%

Foreword to the Special Issue on Ejecta

Buttler

Williams

Najjar

2017

J. dynamic behavior mater.

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A Brief History of Ejecta Physics 1950s and 1960sThere exists anecdotal evidence that ejecta research began in the 1950s, but little of this early research was documented publicly. In Russia, the ejecta phenomenon was first observed in plate impact experiments, and shown to be dependent on the initial surface roughness [1]. The Los Alamos PHERMEX radiographic facility was used to study the production and interaction of jets from shocked surfaces, starting from its very first shot in 1963 [2]. By 1969, Bristow and Hyde [3] describe the results of a mature program in the UK using photographic imaging of ejecta processes to infer whether melt had occurred at the surface of shocked materials. They showed that drive nonuniformity and subsurface fragmentation (spall/scabbing) were also contributory factors in determining the nature of ejecta produced. 1970sThe earliest published ejecta research was done by James Asay [4]. Asay went on to develop a non-radiographic ejecta diagnostic, the eponymous Asay foil [5]. Later, he developed a prescriptive model of ejecta, where he associated the amount of mass ejected from a shocked surface to the volume of surface defects, the rise time of the shock impulse, the yield strength of the material, and the phase of the material on release, i.e., liquid or solid [6]; interestingly he also observed that ejecta production was independent over broad ranges to the peak loading stress P S . Los Alamos National Laboratory (LANL) also became active in the development of ejecta diagnostics, as released by Hopson and Olinger [7].Ejecta physics is a young field, having developed over the last 60 years or so. Essentially, ejecta forms as a spray of dense particles generated from the free surface of metals subjected to strong shocks, but the detailed mechanisms controlling the properties of this particulate ejecta are only now being fully elucidated. The field is dynamic and rapidly growing, with military and industrial applications, and applications to areas such as fusion research.This Special Issue on Ejecta reports the current state of the art in ejecta physics, describing experimental, theoretical and computational work by research groups around the world. While much remains to be done, the dramatic recent progress in the field, some of it first reported here, means that this volume provides a particularly timely review.In this foreword, we provide a brief historical overview of the development of ejecta physics, to define the context for the work in the rest of this Special Issue.

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“…A number of experiments have been performed to study the spike and bubble growth in plane wave driven Richtmyer-Meshkov instability growth in both solid and liquid metals [27][28][29][30][31]. These data have been used to develop new models of the dynamics of instability growth and ejecta formation with unsupported shocks.…”

Section: Richtmyer-meshkov Instability With the ×3 Lensmentioning

confidence: 99%

New Developments in Proton Radiography at the Los Alamos Neutron Science Center (LANSCE)

et al. 2015

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An application of nuclear physics, a facility for using protons for flash radiography, has been developed at the Los Alamos Neutron Science Center (LANSCE). Protons have proven far superior to high energy x-rays for flash radiography because of their long mean free path, good position resolution, and low scatter background. Although this facility is primarily used for studying very fast phenomena such as high explosive driven experiments, it is finding increasing application to other fields, such as tomography of static objects, phase changes in materials and the dynamics of chemical reactions. The advantages of protons are discussed, data from some recent experiments will be reviewed and concepts for new techniques are introduced.

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The study of high-speed surface dynamics using a pulsed proton beam

Cited by 25 publications

References 10 publications

Mass-velocity and size-velocity distributions of ejecta cloud from shock-loaded tin surface using atomistic simulations

Mass-velocity and size-velocity distributions of ejecta cloud from shock-loaded tin surface using atomistic simulations

Foreword to the Special Issue on Ejecta

New Developments in Proton Radiography at the Los Alamos Neutron Science Center (LANSCE)

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