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Rosmej O.N.,Helmholtz Center for Heavy Ion Research | Bagnoud V.,Helmholtz Center for Heavy Ion Research | Eisenbarth U.,Helmholtz Center for Heavy Ion Research | Vatulin V.,All Russian Scientific Research Institute of Experimental Physics | And 14 more authors.
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2011

Interaction of soft X-ray thermal radiation with polymer foam layers has been studied experimentally. Indirectly heated CHO-foams were used to create a plasma target for applications in combined heavy ion beam-laser experiments that are aimed at investigation of the heavy ion energy loss in ionized matter. In this work, we report experimental results on heating of low Z foams by means of the Planckian radiation generated in gold hohlraums. The experimental goal was to study the hohlraum radiation field, duration of the soft X-ray pulse, the conversion efficiency of the laser energy into soft X-rays, measurements of the absorption properties of foam layers and parameters of the foam targets heated by the Plankian radiation. © 2011 Elsevier B.V.

Orlov N.Yu.,RAS Joint Institute for High Temperatures | Denisov O.B.,RAS Joint Institute for High Temperatures | Rosmej O.N.,Helmholtz Center for Heavy Ion Research | Schafer D.,Institute for X optics | And 8 more authors.
Laser and Particle Beams | Year: 2011

Theoretical and experimental studies of radiative properties of substances heated by pulsed current devises or lasers and used as X-ray sources have been carried out depending on plasma conditions, and specific spectra of X-ray absorption and radiation for different materials have been calculated. Important features of the theoretical model, known as the ion model of plasma, are discussed. This model can be applied for calculations of the radiative properties of complex materials over a wide range of plasma parameters. For purposes of indirect-driven inertial fusion based on the hohlraum concept, an optimization method is used for the selection of an effective complex hohlraum wall material, which provides high radiation efficiency at laser interaction with the wall. The radiation efficiency of the resulting material is compared with the efficiency of other composite materials that have previously been evaluated theoretically. A similar theoretical study is performed for the optically thin X-pinch plasma produced by exploding wires. Theoretical estimations of radiative efficiency are compared with experimental data that have been obtained from measurements of X-pinch radiation energy yield using two exploding wire materials, NiCr and Alloy 188. It is shown that the theoretical results agree well with the experimental data. A symmetric multilayer X-pinch, where W and Mo wires are used, is as well considered. The theoretical explanation of experimental phenomena is discussed based on the W and Mo radiative spectra. The ion model was as well applied for interpretation of experimental results on opacities of CHO-plasma obtained via indirect heating of low density polymer layers by means of soft X-rays. The new diagnostics method based on the deformation of the of the Carbon absorption K-edge when foam layer is heated to plasma is discussed. The spectral coefficients for X-ray absorption in CHO-plasma are calculated in the photon energy region around the Carbon K-edge for different plasma temperatures and mean foam density. In this case, the Carbon K-edge position on the energy scale can be used for plasma temperature diagnostic. © 2010 Cambridge University Press.

Khmelnikov E.A.,Ural Federal University | Styrov A.V.,Ural Federal University | Smagin K.,Ural Federal University | Rudenko V.L.,Federal State Enterprise Nizhny Tagil Institute of Metal Testing | And 5 more authors.
Proceedings - 27th International Symposium on Ballistics, BALLISTICS 2013 | Year: 2013

Results of experiments and numerical modeling of fluoropolymer projectiles penetration processin aluminium-based targets are presented. Analysis of mathematical models of elastoplastic projectile interaction with target without taking into consideration additional energy released during interaction of fluoropolymer with aluminium is carried out. Energy fraction which is spent effectively on cavity volume increase is determined. A promising direction in arms development is using "reactive materials" inits design instead of inert ones. One of the first works in thisdirection were experiments carried out in Ural Federal Universitybetween 1984 and 1988 [1,2]. In the USA first works on reactivematerials were published in the end of 1990s and beginning of 2000s. Beside USA, UK and China are also involved in research and testing of newprinciples of damage increase for kinetic, shaped charge and fragmentation projectiles by including reactive materials in theirdesign. Application of reactive materials in the future could allow solving a wide range of tasks - from increasing damage and effectivenessto enhancing their safety and reliability. One of the components of modern mixture reactive materials is fluoropolymer (TFE). Fluoropolymer has the ability to develop chemical reactions with energy release under certain conditions, not only under static loads and heating [1-3], but also under high-speed deformation together with targets containing aluminium [4-6]. The goal of the investigations is to determine fluoropolymer'sbehavior under conditions of dynamic high-speed loading during the interaction with titanium alloys, and also to determine the behaviour of target material. Additional energy, that is released in the exothermic chemical reactions of fluoropolymer is transferred into mechanical work on cavity expansion in target; and the amount of effective work increases with the impact velocity. In order to check this effect, a comparative analysis of experimental data of dynamic interaction of combined (containing fluoropolymer and inert filler: textolite or ebonite) and monolith metal projectiles with half-space targets from aluminium alloys AMn1 and D16-AT.

Buyko A.M.,All Russian Scientific Research Institute of Experimental Physics | Volkov G.I.,All Russian Scientific Research Institute of Experimental Physics | Gorbachev Yu.N.,All Russian Scientific Research Institute of Experimental Physics | Yegorychev B.T.,All Russian Scientific Research Institute of Experimental Physics | And 22 more authors.
PPPS 2001 - Pulsed Power Plasma Science 2001 | Year: 2015

A joint US/Russian Advanced Liner Technology experiment ALT-1 was conducted to simulate the anticipated performance of the Atlas capacitor bank. A disk-explosive magnetic generator and foil opening switch were used to produce an electrical current waveform that reached a peak value of 32.5 MA and that imploded an aluminum liner to an inner surface velocity of 12 km/s. © 2002 IEEE.

Khmelnikov E.A.,Ural Federal University | Styrov A.V.,Ural Federal University | Kravchenko N.S.,Ural Federal University | Smagin K.V.,Ural Federal University | And 3 more authors.
International Journal of Energetic Materials and Chemical Propulsion | Year: 2016

The results of experiments and numerical modeling of fluoropolymer projectile penetration processes into aluminum-based targets are presented in this paper. The analysis of mathematical models of the elastoplastic projectile interaction with a target is examined, in which consideration of additional energy released during the interaction of fluoropolymer with aluminum was not taken into account. The energy fraction is determined, which is spent effectively on the increase in the volume of the cavity. This paper gives a comparison of the experimental results and the calculations on penetration of combined and inert projectiles. © 2016 by Begell House, Inc.

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