WorldCat Identities

Velikovich, A. L. (Aleksandr Lazarevich) 1951-

Overview
Works: 47 works in 57 publications in 3 languages and 286 library holdings
Roles: Editor
Classifications: QC168.85.S45, 533.293
Publication Timeline
Key
Publications about  A. L Velikovich Publications about A. L Velikovich
Publications by  A. L Velikovich Publications by A. L Velikovich
Most widely held works by A. L Velikovich
Physics of shock waves in gases and plasmas by A. L Velikovich ( Book )
9 editions published between 1985 and 1986 in English and held by 223 WorldCat member libraries worldwide
Fizika udarnykh voln v gazakh i plazme by A. L Velikovich ( Book )
2 editions published in 1987 in Russian and held by 9 WorldCat member libraries worldwide
Physics of ionizing shock waves in magnetic fields by M. A Liberman ( Book )
1 edition published in 1982 in English and held by 6 WorldCat member libraries worldwide
On two-dimensional self-similar motion with azimuthal magnetic field by Reinhard F Schmalz ( Book )
2 editions published in 1984 in German and English and held by 6 WorldCat member libraries worldwide
Direct Observation of Mass Oscillations due to Ablative Richtmyer-Meshkov Instability and Feedout in Planar Plastic Targets ( )
1 edition published in 2002 in English and held by 1 WorldCat member library worldwide
Perturbations that seed Rayleigh-Taylor (RT) instability in laser-driven targets form during the early-time period. This time includes a shock wave transit from the front to the rear surface of the target, and a rarefaction wave transit in the opposite direction. During this time interval, areal mass perturbations caused by all sources of nonuniformity (laser imprint, surface ripple) are expected to oscillate. The first direct experimental observations of the areal mass oscillations due to ablative Richtmyer-Meshkov (RM) instability and feedout followed by the RT growth of areal mass modulation are discussed. The experiments were made with 40 to 99 mm thick planar plastic targets rippled either on the front or on the rear with a sine wave ripple with either 30 or 45 mm wavelength and with 0.5, 1 or 1.5 mm amplitude. Targets were irradiated with 4 ns long Nike KrF laser pulses at approximately 50 TW/cm2. The oscillations were observed with our novel diagnostic technique, a monochromatic x-ray imager coupled to a streak camera. For the ablative RM instability (front side ripple), the mass modulation amplitude was typically observed to grow, reach a peak, and then decrease, after which the exponential RT growth started. In some cases, one phase reversal due to the ablative RM instability was observed. For the feedout geometry (rear side ripple), in all cases two phase reversals were observed: a distinct half-oscillation was followed by the onset of the RT growth, resulting in a second phase reversal
Shock waves in a plasma by A. L Velikovich ( Book )
in English and held by 1 WorldCat member library worldwide
Magnetohydrodynamic shock waves in a plasma by A. L Velikovich ( Book )
in English and held by 1 WorldCat member library worldwide
Dynamics of shock waves in a magnetic field by A. L Velikovich ( Book )
in English and held by 1 WorldCat member library worldwide
Direct-Drive Laser Target Designs for Sub-MegaJoule Energies ( )
1 edition published in 2007 in English and held by 1 WorldCat member library worldwide
New direct-drive laser target designs with KrF laser light take advantage of the shorter wavelength to lower the laser energy required for substantial gain (>30x) to sub-MJ level. These low laser-energy pellets are useful in systems that could form an intermediate step towards fusion energy, such as the proposed Fusion Test Facility [S.P. Obenschain, et al, Phys. Plasmas 13, 056320 (2006)]. The short wavelength laser should allow higher intensity (and higher pressure) without increasing the risk of laser-plasma instabilities. The higher pressure in turn allows higher velocities to be achieved while keeping the low aspect ratios required for hydrodynamic stability. The canonical laser energy has been chosen to be 500 kJ. A target design is presented with various laser pulse shapes and both 1D and 2D simulation results are shown. The sensitivity of these targets to both low-mode and high-mode perturbations is examined. The analysis and simulations in this paper indicate that significant gain (G=57) can be achieved for these targets even in the presence of hydrodynamic instabilities
Magnetohydrodynamic shock waves in a plasma by A. L Velikovich ( Book )
in English and held by 1 WorldCat member library worldwide
Alternate Approaches to Laser Guided Discharges ( )
1 edition published in 2006 in English and held by 1 WorldCat member library worldwide
We propose a novel use of laser induced breakdown channels to establish a transmission line through air, which terminates at a distant load object
Introduction to the theory of gasdynamic shock waves by A. L Velikovich ( Book )
in English and held by 1 WorldCat member library worldwide
Ionizing shock waves in a magnetic field by A. L Velikovich ( Book )
in English and held by 1 WorldCat member library worldwide
Large-Scale High-Resolution Simulations of High Gain Direct-Drive Inertial Confinement Fusion Targets ( )
1 edition published in 2004 in English and held by 1 WorldCat member library worldwide
Targets have been designed that produce moderate to high gain when directly driven by lasers. The intrinsic sensitivity of these targets to hydro instabilities is found using the FAST(2D) multidimensional radiation hydrocode [J.H. Gardner, A.J. Schmitt, J.P. Dahlburg, et al., Phys. Plasmas 5, 1935 (1998)], which simulates the simultaneous behavior of a large bandwidth (e.g., l = 2-256) of perturbations from compression to acceleration, and then to stagnation and burn. The development of the structure in these multi-mode simulations is benchmarked to theoretical analysis and single-mode calculations, which reveals the need to "renormalize" the simulation after compression. The simulations predict that a direct drive point design is expected to degrade significantly from its 1-D clean yield, yet still ignite and give appreciable gain. Simulations of high-gain pellets using a spike prepulse to inhibit Richtmyer-Meshkov growth show a considerable robustness, with high (> 100) gains possible even with nominal surface finishes and laser imprint
Dynamics of shock waves in a magnetic field by A. L Velikovich ( Book )
in English and held by 1 WorldCat member library worldwide
Introduction to the theory of gasdynamic shock waves by A. L Velikovich ( Book )
in English and held by 1 WorldCat member library worldwide
Shock waves in a plasma by A. L Velikovich ( Book )
in English and held by 1 WorldCat member library worldwide
Instability of a Planar Expansion Wave ( )
1 edition published in 2005 in English and held by 1 WorldCat member library worldwide
An expansion wave is produced when an incident shock wave interacts with a surface separating a fluid from a vacuum. Such an interaction starts the feedout process that transfers perturbations from the rippled inner (rear) to the outer (front) surface of a target in inertial confinement fusion. Being essentially a standing sonic wave superimposed on a centered expansion wave, a rippled expansion wave in an ideal gas, like a rippled shock wave, typically produces decaying oscillations of all fluid variables. Its behavior, however, is different at large and small values of the adiabatic exponent gamma. At gamma> 3, the mass modulation amplitude delta-m in a rippled expansion wave exhibits a power-law growth with time alpha tau(beta), where beta = (gamma - 3)/(gamma - 1). This is the only example of a hydrodynamic instability whose law of growth, dependent on the equation of state, is expressed in a closed analytical form. The growth is shown to be driven by a physical mechanism similar to that of a classical Richtmyer-Meshkov instability. In the opposite extreme gamma - 1 much less than 1, delta-m exhibits oscillatory growth, approximately linear with time, until it reaches its peak value approximately (gamma - 1)^( - 1/2), and then starts to decrease. The mechanism driving the growth is the same as that of Vishniac's instability of a blast wave in a gas with low gamma. Exact analytical expressions for the growth rates are derived for both cases and favorably compared to hydrodynamic simulation results
Dynamics of shock waves in a magnetic field by A. L Velikovich ( Book )
in English and held by 1 WorldCat member library worldwide
Ionizing shock waves in a magnetic field by A. L Velikovich ( Book )
in English and held by 1 WorldCat member library worldwide
 
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Alternative Names
Velikovič, A. L.
Velikovich, A. L.
Velikovich, Aleksandr L., 1951-
Velikovich, Aleksandr Lazarevich.
Velikovich, Aleksandr Lazarevich, 1951-
Velikovich, Alexander L.
Velikovich, Alexander L., 1951-
Languages
English (27)
Russian (2)
German (1)
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