Daniela Kartoon

• Doctor of Philosophy
• Ben-Gurion University of the Negev

We present a design and first use of a kJ level laser facility for research of non-local thermodynamic equilibrium atomic physics using the buried layer target method. The target design included a metal layer buried inside a plastic tamper with thicknesses tailored to the expected laser intensities. The target was illuminated from each side by two...

Modeling of phase diagrams and in particular the anomalous reentrant melting curves of the alkali metals is an open challenge for interatomic potentials. Machine learning-based interatomic potentials have shown promise in overcoming this challenge, unlike earlier embedded atom-based approaches. We introduce a relatively simple and cheap approach to...

Rubidium, like the other alkali metals, exhibits multiple structural transformations in its solid phase upon application of pressure. Recent experiments and calculations suggest it also goes through a phase transformation in its liquid state, along the 573 K isotherm, slightly above its melting curve. We employ ab initio molecular dynamic simulatio...

Many half-filled p-band materials form complex, semiconducting or semi-metallic crystallographic structures, which are commonly conceived of as distortions of simpler, higher-symmetry structures. This distortion is conventionally attributed to the energy gained by the opening of a band gap in the vicinity of the Fermi level, which was assumed to lo...

At high pressure, bismuth acquires a complex incommensurate host-guest structure, only recently discovered. Characterizing the structure and properties of this incommensurate phase from first principles is challenging owing to its nonperiodic nature. In this study we use large-scale density functional theory calculations to model commensurate appro...

At high pressure, bismuth acquires a complex incommensurate host-guest structure, only recently discovered. Characterizing the structure and properties of this incommensurate phase from first principles is challenging owing to its non-periodic nature. In this study we use large scale DFT calculations to model commensurate approximants to the Bi-III...

The onset of distortion in one-dimensional monatomic chains with partially filled valence bands is considered to be well-established by the Peierls theorem, which associates the distortion with the formation of a band gap and a subsequent gain in energy. Employing modern total energy methods on the test cases of lithium, sodium and carbon chains, w...

The onset of distortion in one-dimensional monatomic chains with partially filled valence bands is considered to be well established by the Peierls theorem, which associates the distortion with the formation of a band gap and a subsequent gain in energy. Employing modern total energy methods on the test cases of lithium, sodium, and carbon chains,...

The late-time nonlinear evolution of the Rayleigh-Taylor (RT) and Richtmyer-Meshkov (RM) instabilities for random initial perturbations is investigated using a statistical mechanics model based on single-mode and bubble-competition physics at all Atwood numbers (A) and full numerical simulations in two and three dimensions. It is shown that the RT...

The passage of a shock wave through a spherical bubble results in the formation of a vortex ring. In the present study, simple dimensional analysis is used to show that the circulation is linearly dependent on the surrounding material speed of sound cs and the initial bubble radius R. In addition, it is shown that the velocities characterizing...

The late-time growth rate of the Richtmyer–Meshkov instability was experimentally studied at different Atwood numbers with two-dimensional (2D) and three-dimensional (3D) single-mode initial perturbations. The results of these experiments were found to be in good agreement with the results of the theoretical model and numerical simulations. In...

The three-dimensional (3D) turbulent mixing zone (TMZ) evolution under Rayleigh–Taylor and Richtmyer–Meshkov conditions was studied using two approaches. First, an extensive numerical study was made, investigating the growth of a random 3D perturbation in a wide range of density ratios. Following that, a new 3D statistical model was developed,...

The late-time nonlinear evolution of the three-dimensional (3D) Rayleigh–Taylor (RT) and Richtmyer–Meshkov (RM) instabilities for random initial perturbations is investigated. Using full 3D numerical simulations, a statistical mechanics bubble-competition model, and a Layzer-type drag-buoyancy model, it is shown that the RT scaling parameters, αB a...

Using a statistical mechanics bubble competition model, Alon et al. (1994,1995) have shown that the two-dimensional Rayleigh-Taylor (RT) mixing zone bubble and spike fronts evolves as h=alpha (B/S).A.g.t(2) with alpha (B)similar to0.05 and alpha (S)similar to alpha (s). (1+A). The Richtmyer-Meshkov (RM) mixing zone fronts have been found to evolve...

In order to verify the predictions of the 2D high Atwood number potential flow model for the evolution of the shock wave induced Richtmyer-Meshkov instability,(1) shock-tube experiments were performed with a single-mode perturbation and two competing bubbles as the initial conditions.(2) The experimental results were compared to theoretical model a...

The late-time nonlinear evolution of the Rayleigh-Taylor (RT) and Richtmyer-Meshkov (RM) instabilities for random initial perturbations is investigated using a statistical mechanics model based on single-mode and bubble-competition physics at all Atwood numbers ( A ) and full numerical simulations in two and three dimensions. It is shown that the R...

In a recent theoretical [Phys. Rev. Lett. 74, 534 (1995)] and experimental work [Phys. Rev. Lett. 80, 1654 (1998)] it was shown that the evolution of shock wave induced 2D Richtmyer-Meshkov (RM) instability can be predicted by using bubble-merger statistical-mechanics models which is based on two fundamental features: the evolution of a single mode...

The late time nonlinear evolution of the Rayleigh-Taylor (RT) and the Richtmyer-Meshkov (RM) instabilities for 3D random initial perturbation is investigated and compared with the scaling laws in 2D. It is shown that the RT mixing zone bubble and spike fronts evolves as h ~ alpha \cdot A \cdot g \cdot t^2 with different alpha's for the bubble and s...

In order to verify the prediction of a 2D high Atwood number potential flow model for the evolution of the shock wave induced Richtmyer-Meshkov instability [Phys. Rev. Lett. 74, 534 (1995)], shock-tube experiments were performed with a single-mode perturbation and two competing bubbles as the initial conditions [Phys. Rev. Lett. 80, 1654 (1998)]. T...

Hydrodynamic instabilities, such as the Rayleigh-Taylor and Richtmyer-Meshkov instabilities, have a central role when trying to achieve net thermonuclear fusion energy via the method of Inertial Confinement Fusion. We shall review recent theoretical, numerical and experimental work that describes the evolution of two-and three-dimensional perturbat...