Shock front
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Ultrafast visualization of crystallization and grain growth in shock-compressed SiO2 Open
Pressure- and temperature-induced phase transitions have been studied for more than a century but very little is known about the non-equilibrium processes by which the atoms rearrange. Shock compression generates a nearly instantaneous pro…
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Study of TeV shell supernova remnants at gamma-ray energies Open
Context. The breakthrough developments of Cherenkov telescopes in the past decade have led to angular resolution of 0.1° and an unprecedented sensitivity. This has allowed the current generation of Cherenkov telescopes (H.E.S.S., MAGIC, an…
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Understanding the effects of radiative preheat and self-emission from shock heating on equation of state measurement at 100s of Mbar using spherically converging shock waves in a NIF hohlraum Open
Over the last six years many experiments have been done at the National Ignition Facility to measure the Hugoniot of materials, such as CH plastic at extreme pressures, up to 800 Mbar. The “Gbar” design employs a strong spherically converg…
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Vacuum high-harmonic generation in the shock regime Open
Electrodynamics becomes nonlinear and permits the self-interaction of fields\nwhen the quantised nature of vacuum states is taken into account. The effect on\na plane probe pulse propagating through a stronger constant crossed background\n…
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Laser-driven shock waves studied by x-ray radiography Open
Multimegabar laser-driven shock waves are unique tools for studying matter under extreme conditions. Accurate characterization of shocked matter is for instance necessary for measurements of equation of state data or opacities. This paper …
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Shocks in relativistic viscous accretion flows around Kerr black holes Open
We study the relativistic viscous accretion flows around the Kerr black holes. We present the governing equations that describe the steady-state flow motion in full general relativity and solve them in 1.5D to obtain the complete set of gl…
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The role of the mobility law of dislocations in the plastic response of shock loaded pure metals Open
This article examines the role that the choice of a dislocation mobility law has in the study of plastic relaxation at shock fronts. Five different mobility laws, two of them phenomenological fits to data, and three more based on physical …
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Diversity of supernovae and impostors shortly after explosion Open
Observational surveys are now able to detect an increasing number of transients, such as core-collapse supernovae (SN) and powerful non-terminal outbursts (SN impostors). Dedicated spectroscopic facilities can follow up these events shortl…
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Termination Shock Measured by Voyagers and IBEX Open
Our heliosphere’s innermost boundary—the termination shock—slows and heats the supersonic solar wind and energizes anomalous cosmic rays (ACRs). We show that in addition to their termination shock crossings, the Voyager 1 and 2 spacecraft …
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Electromagnetic shocks in the quantum vacuum Open
The interaction of two counter-propagating electromagnetic waves in a vacuum\nis analyzed within the framework of the Heisenberg-Euler formalism in quantum\nelectrodynamics. The nonlinear electromagnetic wave in the quantum vacuum is\nchar…
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Theory of the corrugation instability of a piston-driven shock wave Open
We analyze the two-dimensional stability of a shock wave driven by a steadily moving corrugated piston in an inviscid fluid with an arbitrary equation of state. For h≤-1 or h>h(c), where h is the D'yakov parameter and h(c) is the Kontorovi…
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Study on a novel high energetic and insensitive munitions formulation: TKX-50 based melt cast high explosive Open
Dihydroxylammonium 5,5′-bistetrazole-1,1′-diolate (TKX-50) is a promising candidate to replace traditional explosives, HMX and RDX, used in insensitive munitions, which is currently being explored to achieve shock insensitive melt cast for…
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Molecular dynamics simulations of ejecta formation in helium-implanted copper Open
The effect of He concentration and morphology on ejecta production is investigated via molecular dynamics simulations. Identical He concentrations are inserted into Cu single crystals as interstitial atoms or bubbles near a flat free surfa…
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Using radio triangulation to understand the origin of two subsequent type II radio bursts Open
Context. Eruptive events such as coronal mass ejections (CMEs) and flares accelerate particles and generate shock waves which can arrive at Earth and can disturb the magnetosphere. Understanding the association between CMEs and CME-driven …
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Radio Spectroscopic Imaging of a Solar Flare Termination Shock: Split-band Feature as Evidence for Shock Compression Open
Solar flare termination shocks have been suggested as one of the promising drivers for particle acceleration in solar flares, yet observational evidence remains rare. By utilizing radio dynamic spectroscopic imaging of decimetric stochasti…
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Data-driven modeling of rotating detonation waves Open
The direct monitoring of a rotating detonation engine (RDE) combustion\nchamber has enabled the observation of combustion front dynamics that are\ncomposed of a number of co- and/or counter-rotating coherent traveling shock\nwaves whose no…
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Expansion of a compressible gas in vacuum Open
Tai-Ping Liu \cite{Liu\_JJ} introduced the notion of "physical solution' of the isentropic Euler system when the gas is surrounded by vacuum. This notion can be interpreted by saying that the front is driven by a force resulting from a Höl…
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Full self-similar solutions of the subsonic radiative heat equations Open
We study the phenomenon of diffusive radiative heat waves (Marshak waves) under general boundary conditions. In particular, we derive full analytic solutions for the subsonic case that include both the ablation and the shock wave regions. …
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A series of shocks and edges in Abell 2219 Open
Here, we present deep, 170 ks, Chandra X-ray observations of Abell 2219 (z = 0.23), one of the hottest and most X-ray luminous clusters known, and which is experiencing a major merger event. We discover a ‘horseshoe’ of high-temperature ga…
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Physics of relativistic collisionless shocks. III. The suprathermal particles Open
In this third paper of a series, we discuss the physics of the population of\naccelerated particles in the precursor of an unmagnetized, relativistic\ncollisionless pair shock. In particular, we provide a theoretical estimate of\ntheir sca…
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Relativistic viscous accretion flow model for ULX sources: a case study for IC 342 X-1 Open
In this paper, we develop a model formalism to study the structure of a relativistic, viscous, optically thin, advective accretion flow around a rotating black hole in presence of radiative coolings. We use this model to examine the physic…
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Nonequilibrium phase transition in compact stars through a violent shock Open
In this letter we study the dynamics of a first order phase transition from\nnucleonic to quark matter in neutron stars. Using standard equations of state\nfor these two phases we find the density range where such a transition is\npossible…
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Melting behind the front of the shock wave Open
A simple caloric model of the equation of state is proposed to describe thermodynamic properties of solid materials with phase transitions with the minimum number of parameters as initial data. Thermodynamic characteristics are calculated …
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Structure of velocity distributions in shock waves in granular gases with extension to molecular gases Open
Velocity distributions in normal shock waves obtained in dilute granular flows are studied. These distributions cannot be described by a simple functional shape and are believed to be bimodal. Our results show that these distributions are …
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A 3D Simulation of a Type II-P Supernova: From Core Bounce to beyond Shock Breakout Open
In order to better connect core-collapse supernova (CCSN) theory with its observational signatures, we have developed a simulation pipeline from the onset of the core collapse to beyond shock breakout from the stellar envelope. Using this …
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Pulsed power driven cylindrical wire array explosions in different media Open
Cylindrical copper wire array explosions were carried out in de-ionized water, sodium polytungstate solution, nitromethane, and polyester in order to obtain high energy density conditions in the vicinity of implosion using the generated co…
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Physical Roles of Interstellar-origin Pickup Ions at Heliospheric Termination Shock. II. Impact of the Front Nonstationary on the Energy Partition and Particle Velocity Distribution Open
The impact of the nonstationarity of the heliospheric termination shock in the presence of pickup ions (PUIs) on the energy partition between different plasma components is analyzed self-consistently by using a one-dimensional particle-in-…
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The Ignition Physics Campaign on NIF: Status and Progress Open
We have made significant progress in ICF implosion performance on NIF since the 2011 IFSA. Employing a 3-shock, high adiabat CH ("High-Foot") design, total neutron yields have increased 10-fold to 6.3 x1015 (a yield of ∼ 17 kJ, which is gr…
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Supersonic-to-subsonic transition of a radiation wave observed at the LMJ Open
We detail results of an experiment performed at the Laser Mégajoule facility aimed at studying transition from supersonic radiation front to shock front in a low density CHOBr foam enclosed in a plastic tube driven by thermal emission prod…
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RGS Observations of Ejecta Knots in Tycho’s Supernova Remnant Open
We present results from XMM-Newton/Reflection Grating Spectrometer (RGS) observations of prominent knots in the southernmost portion of Tycho’s supernova remnant, known to be the remnant of a Type Ia supernova in 1572 C.E. By dispersing th…