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Bitulev A.A.,All Russia Research Institute of Automatics VNIIA | Churin S.V.,All Russia Research Institute of Automatics VNIIA | Shchitov N.N.,All Russia Research Institute of Automatics VNIIA | Yurkov D.I.,All Russia Research Institute of Automatics VNIIA | And 4 more authors.
Atomic Energy | Year: 2015

Optimization of the operating regime of power supply circuits of vacuum neutron tubes by inserting additional elements eliminates the instability of current flow, matches the acceleration and discharge pulses, and makes it possible to decrease significantly the current and neutron load on the ion source. In addition, the neutron yield does not decrease, as experiments confirm. © 2015 Springer Science+Business Media New York


Kosov M.V.,Institute of Theoretical and Experimental Physics | Kudinov I.V.,All Russia Research Institute of Automatics VNIIA | Savin D.I.,Moscow Institute of Physics and Technology
EPJ Web of Conferences | Year: 2014

A novel TPT code (Toolkit for Particle Transport), which is included in CHIPS-TPT physics list for Geant4 simulations, is briefly overviewed. Underlying concept of exclusive modelling is introduced and its beneficial features are illustrated with several examples. Widely used neutron Monte Carlo codes, MCNP and Geant4/HP, are based on inclusive algorithms that independently model neutron state change and secondary particles production while tracking. The exclusive approach implemented in TPT overcomes this unphysical separation and makes it possible to allow for kinematic restrictions as well as correlated emission of gamma-rays and secondaries. © Owned by the authors, published by EDP Sciences, 2014.


Shumakov A.V.,All Russia Research Institute of Automatics VNIIA
Atomic Energy | Year: 2014

The critical regions (parts of space surveyed by a monitor) where it is expedient to use different combinations of detector counts (criteria) are determined. Variants with one, two, and four detectors – to which cases with a large number of detectors reduce – are examined. It is shown that there exist regions, comprising half the controlled space, where the use of additional detectors and criteria is inexpedient. The form and size of these regions depend on the relative arrangement of the detectors. The results obtained can be used to optimize the arrangement of detectors and to reduce the detection thresholds of stationary radiation monitors. © 2014 Springer Science+Business Media New York


Andriash A.V.,All Russia Research Institute of Automatics VNIIA | Bobylev A.V.,Karlstad University | Brantov A.V.,Russian Academy of Sciences | Yu Bychenkov V.,Russian Academy of Sciences | And 2 more authors.
Problems of Atomic Science and Technology | Year: 2013

A general approach to Monte Carlo methods for Coulomb collisions is proposed. Its key idea is an approximation of Landau-Fokker-Planck (LFP) equations by Boltzmann equations of quasi-Maxwellian kind. Highfrequency fields are included into consideration and comparison with the well-known results are given.


Yushkov G.Y.,Institute of High Current Electronics | Nikolaev A.G.,Institute of High Current Electronics | Frolova V.P.,Institute of High Current Electronics | Oks E.M.,Tomsk State University of Control Systems and Radioelectronics | And 2 more authors.
Technical Physics Letters | Year: 2014

An experimental study of the mass-charge composition of a vacuum arc plasma with zirconium cathode saturated with deuterium is carried out. It is shown that this system provides effective generation of deuterium ions with an integral fraction of about 60% per pulse of an arc current. The deuterium content in a vacuum arc plasma is maximum in the initial stage of discharge burning and considerably decreases during the first 150 μs of an arc current pulse. The cathode deuteration also leads to decreasing average ion charge of metallic substrate in the plasma of a vacuum arc discharge. © 2014, Pleiades Publishing, Ltd.


Solovyev A.S.,All Russia Research Institute of Automatics VNIIA | Igashov S.Yu.,All Russia Research Institute of Automatics VNIIA | Tchuvil'Sky Y.M.,Moscow State University
Bulletin of the Russian Academy of Sciences: Physics | Year: 2014

The radiative capture reaction t + α → 7Li + γ is investigated in the framework of the algebraic version of the resonating group method at low energies. The Hasegawa-Nagata nucleon-nucleon potential is used in calculations. The lowest compatible with the Pauli exclusion principle wave functions of a translationally invariant shell model are adopted as the internal wave functions for α and t clusters. The obtained results are in reasonable agreement with the experimental data. © 2014 Allerton Press, Inc.


Solovyev A.S.,All Russia Research Institute of Automatics VNIIA | Igashov S.Y.,All Russia Research Institute of Automatics VNIIA | Tchuvil'Sky Y.M.,Moscow State University
Journal of Physics: Conference Series | Year: 2014

A unified microscopic approach based on the algebraic version of the resonating group model has been realized for description of the radiative capture reactions 3H(α, γ)7Li and 3He(α, γ)7Be, which play an important role for modern nuclear astrophysics. The astrophysical S-factors of the reactions and branching ratios between capture to the ground and first excited states of the 7Li and 7Be nuclei have been calculated. The comparison with the most recent experimental data demonstrates a good agreement. © Published under licence by IOP Publishing Ltd.


Sorokina E.,Institute of Theoretical and Experimental Physics | Blinnikov S.,University of Tokyo | Blinnikov S.,All Russia Research Institute of Automatics VNIIA | Nomoto K.,University of Tokyo | And 3 more authors.
Astrophysical Journal | Year: 2016

A number of Type I (hydrogenless) superluminous supernova (SLSN) events have been discovered recently. However, their nature remains debatable. One of the most promising ideas is the shock interaction mechanism, but only simplified semi-analytical models have been applied so far. We simulate light curves for several Type I SLSN (SLSN-I) models enshrouded by dense, non-hydrogen circumstellar (CS) envelopes, using a multi-group radiation hydrodynamics code that predicts not only bolometric, but also multicolor light curves. We demonstrate that the bulk of SLSNe-I including those with relatively narrow light curves like SN 2010gx or broad ones like PTF09cnd can be explained by the interaction of the SN ejecta with the CS envelope, though the range of parameters for these models is rather wide. Moderate explosion energy (∼(2-4) × 1051 erg) is sufficient to explain both narrow and broad SLSN-I light curves, but ejected mass and envelope mass differ for those two cases. Only 5-10 M o of non-hydrogen material is needed to reproduce the light curve of SN 2010gx, while the best model for PTF09cnd is very massive: it contains almost 50 M o in the CS envelope and only 5 M o in the ejecta. The CS envelope for each case extends from 10 R o to ∼105 R o (7 × 1015 cm), which is about an order of magnitude larger than typical photospheric radii of standard SNe near the maximum light. We briefly discuss possible ways to form such unusual envelopes. © 2016. The American Astronomical Society. All rights reserved.


Solovyev A.S.,All Russia Research Institute of Automatics VNIIA | Igashov S.Y.,All Russia Research Institute of Automatics VNIIA | Tchuvil'sky Y.M.,Moscow State University
Bulletin of the Russian Academy of Sciences: Physics | Year: 2015

The 3He(α, γ)7Be nuclear reaction, which is of great interest for modern nuclear astrophysics, is investigated. The astrophysical S-factor of the reaction is calculated using the algebraic version of the resonating group model. The results agree with current experimental data. © 2015, Allerton Press, Inc.


Alkhimova M.A.,National Research Nuclear University MEPhI | Ananin O.B.,National Research Nuclear University MEPhI | Bogdanov G.S.,National Research Nuclear University MEPhI | Vovchenko E.D.,National Research Nuclear University MEPhI | And 5 more authors.
Physics Procedia | Year: 2015

The source of X-ray radiation with quantum energy in the range hv = 1-0 keV was developed for interaction of x-ray with matter and modification of solid surface. It was based on vacuum spark discharge with laser-triggering. The comprehensive study of X-rays imaging, quantum energy and temporal characteristics was carried out. Correlated estimates of the temperature of the investigated plasma based on moderate powerful vacuum discharge were obtained using the two methods in the case of lowstored energy (E<1 J). © 2015 The Authors.

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