RAS Federal Nuclear Center

Nizhny Novgorod, Russia

RAS Federal Nuclear Center

Nizhny Novgorod, Russia
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Agency: European Commission | Branch: FP7 | Program: CPCSA | Phase: INFRA-2008-1.2.2 | Award Amount: 3.39M | Year: 2009

Many research groups and institutes within the European Research Area (ERA) are playing a central role in the production of a vast range of atomic and molecular (AM) data, data that is of critical importance across a wide range of applications such as astrophysics, atmospheric physics, fusion, environmental sciences, combustion chemistry and in industrial applications from plasmas to lighting.\n\nThrough the auspices of this infrastructure the Virtual Atomic and Molecular Data Centre (VAMDC) aims to build a secure, documented, flexible and interoperable e-science environment-based interface to the existing AM data. The VAMDC will be built upon the expertise of existing AM databases, data producers and service providers with the specific aim of creating an infrastructure that is easily tuned to the requirements of a wide variety of users in academic, governmental, industrial or public communities both within and outside the ERA. The project will cover the building of the core consortium, the development and deployment of the infrastructure and the development of interfaces to the existing AM databases as well as providing a forum for training potential users and dissemination of expertise across the ERA. It is expected that VAMDC becomes a European legal entity during the course of the project.

Kurkov A.S.,RAS A.M. Prokhorov General Physics Institute | Dvoyrin V.V.,Fiber Optics Research Center | Marakulin A.V.,RAS Federal Nuclear Center
Optics Letters | Year: 2010

Three all-fiber Ho-doped lasers emitting in the range of 2050-2100 nm were fabricated. The lasers were pumped by an Yb-doped fiber laser at 1147 nm with a power up to 35 W. For all the lasers tested, the output power was found to be as high as 10 W, the efficiency slope being 30%. © 2010 Optical Society of America.

Kosyakov B.P.,RAS Federal Nuclear Center
European Journal of Physics | Year: 2014

In this paper we outline two subjects of relativistic mechanics: (i) the set of allowable world lines, and (ii) the origin of the relativistic law of dynamics governing point particles. We show that: (i) allowable world lines in the classical theory of particles and fields are quite simple geometric objects as opposed to their associated three-dimensional trajectories; and (ii) Newton's second law requires neither modification nor generalization, it should only be smoothly embedded in the four-dimensional geometry of Minkowski spacetime to yield the dynamical law for relativistic particles. © 2014 IOP Publishing Ltd.

Garanin S.G.,RAS Federal Nuclear Center
Physics-Uspekhi | Year: 2011

Work on the development of high-power lasers was initiated at the All-Russian Research Institute of Experimental Physics in 1963 by the scientific supervisor Yu B Khariton. Physical processes proceeding during the explosion of a thermonuclear charge occur at high energy densities. And although such high energy densities cannot yet be achieved under laboratory conditions, it is possible to improve the understanding of the physics of these processes by refining theoretical models for simulations and testing them in laboratory experiments. An advantage of laser studies is the possibility of performing repeated experiments by using the developing precision diagnostic. Investigations performed at the Iskra-4 facility were mainly devoted to the direct drive targets in the exploding-shell mode. An important stage of investigations covered the X-ray field characteristics inside the box, the field spectrum, the effective temperature, and the symmetry properties of irradiation of the central target.

Trunin R.F.,RAS Federal Nuclear Center
Physics-Uspekhi | Year: 2011

The examination of extreme states of metals using shock wave techniques is presented. The techniques proposed for determining the parameters of shock-compressed substances enabled making the first measurements of their characteristics already in 1947. The first substance whose properties had to be known to ensure the success of a bomb test was the explosive that was part of the bomb. Special methods were introduced for determining the particle velocity, permitting indirect determination of this parameter. The Hugoniot adiabat is the main source of experimental information that underlies the determination of other matter equations of state. Other shock wave characteristics of material sound velocities behind the shock front, expansion and two fold compression adiabats, shock compression temperatures, and so on are directly related to the shock adiabat and are largely determined by it.

Gorbatenko M.V.,RAS Federal Nuclear Center | Neznamov V.P.,RAS Federal Nuclear Center
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2011

Proofs of two statements are provided in this paper. First, the authors prove that the formalism of the pseudo-Hermitian quantum mechanics allows for describing the Dirac particles motion in arbitrary stationary gravitational fields. Second, it is proved that using the Parker weight operator and the subsequent transition to the η representation gives the transformation of the Schrödinger equation for the nonstationary metric, when the evolution operator becomes self-conjugate. The scalar products in the η representation are flat, which makes possible the use of a standard apparatus for the Hermitian quantum mechanics. Based on the results of this paper the authors draw a conclusion about solution of the problem of uniqueness and self-conjugacy of Dirac Hamiltonians in arbitrary gravitational fields including those dependent on time. The general approach is illustrated by the example of Dirac Hamiltonians for several stationary metrics, as well as for the cosmologically flat and the open Friedmann models. © 2011 American Physical Society.

Dwyer J.R.,Florida Institute of Technology | Babich L.P.,RAS Federal Nuclear Center
Journal of Geophysical Research: Space Physics | Year: 2011

This paper investigates the production of low-energy (few eV) electrons by relativistic runaway electron avalanches. This work is motivated by a growing body of literature that claims that runaway electron avalanches produce an anomalous growth of low-energy electrons and hence an anomalously large electrical conductivity, a factor of 50 larger than expected from standard calculations. Such large enhancements would have a substantial impact on properties of runaway electron avalanches and their observable effects. Indeed, these purportedly large conductivities have been used to argue that runaway electron avalanches result in a novel form of electrical breakdown called "runaway breakdown." In this paper, we present simple analytical calculations, detailed Monte Carlo simulations, and a review of the experimental literature to show that no such anomalous growth of low-energy electron populations exists. Consequently, estimates of the conductivity generated by a runaway electron avalanche have been greatly exaggerated in many previous papers, drawing into question several of the claims about runaway breakdown. Copyright 2011 by the American Geophysical Union.

Ilkaev R.I.,RAS Federal Nuclear Center
Physics-Uspekhi | Year: 2012

21 May 2011 would have marked the 90th birthday of Andrei Dmitrievich Sakharov, a towering 20th-century figure in science and human thought, whose ideas, research contribu- tions, and life example exerted enormous influence on the history of the second half of the 20th century and, in particu- lar, on the history of Russia. Whether as a scientist or a private person (including his public activities and exceptional attitude to human personality), he always displayed creativity and a freedom of spirit, thought, and action. Sakharov's life and creative work make him a model scientist and citizen for many and undoubtedly provide a legacy for the development of science and society in the 21st century. In this paper, some of Sakhar- ov's key ideas and achievements relating to his KB-11 period are exemplified, and how they influence present day research and technology, notably as employed for affording national secur- ity, is examined. © 2012 Uspekhi Fizicheskikh Nauk, Russian Academy of Sciences.

Smirnov N.A.,RAS Federal Nuclear Center
Physical Review B - Condensed Matter and Materials Physics | Year: 2011

This paper presents results obtained in ab initio calculations of the thermodynamic properties of B1 and B2 lithium fluoride under pressure. The data were used to calculate LiF isotherms and isochors at pressures from 0 to 500 GPa and temperatures up to the melting point. Calculated results are compared with available theoretical and experimental data on the shock and static compression of LiF crystal. Based on the analysis of our calculations and available experimental data, a hypothetical (P,T) diagram of LiF which includes the crystalline phases B1 and B2 and liquid is proposed. © 2011 American Physical Society.

Piskunov V.N.,RAS Federal Nuclear Center
Journal of Physics A: Mathematical and Theoretical | Year: 2012

The paper analyzes the asymptotic behavior of disperse systems with coagulation and fragmentation of particles. The possible types of self-similarity regimes have been analyzed and conditions required for their existence have been set. The generalized approximation method (GA-method) numerical simulation is used to determine the actual behavior of moments L α(t). The examples of GA-method application show its suitability for use in research problems. In general, the obtained results show that binary breakage coagulation is a wide and non-trivial scope for investigation. A number of regimes are represented such as steady state, coagulation winning, gelation, collapsing self-similarity and spectrum singularity. The existence of collapsing (accumulating in zero) self-similar spectra is illustrated in terms of a particular example of the coagulation kernel K(g, n) = gn and breakage rate f(g, n) = a. © 2012 IOP Publishing Ltd.

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