Персона: Гасилов, Владимир Анатольевич
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Институт ядерной физики и технологий
Цель ИЯФиТ и стратегия развития - создание и развитие научно-образовательного центра мирового уровня в области ядерной физики и технологий, радиационного материаловедения, физики элементарных частиц, астрофизики и космофизики.
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Владимир Анатольевич
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- ПубликацияОткрытый доступLaser-heated capillary discharge plasma waveguides for electron acceleration to 8 GeV(2020) Gonsalves, A. J.; Nakamura, K.; Benedetti, C.; Pieronek, C. V.; Bagdasarov, G.; Gasilov, V.; Гасилов, Владимир АнатольевичA plasma channel created by the combination of a capillary discharge and inverse Bremsstrahlung laser heating enabled the generation of electron bunches with energy up to 7.8GeV in a laser-driven plasma accelerator. The capillary discharge created an initial plasma channel and was used to tune the plasma temperature, which optimized laser heating. Although optimized colder initial plasma temperatures reduced the ionization degree, subsequent ionization from the heater pulse created a fully ionized plasma on-axis. The heater pulse duration was chosen to be longer than the hydrodynamic timescale of approximate to 1ns, such that later temporal slices were more efficiently guided by the channel created by the front of the pulse. Simulations are presented which show that this thermal self-guiding of the heater pulse enabled channel formation over 20cm. The post-heated channel had lower on-axis density and increased focusing strength compared to relying on the discharge alone, which allowed for guiding of relativistically intense laser pulses with a peak power of 0.85 PW and wakefield acceleration over 15 diffraction lengths. Electrons were injected into the wake in multiple buckets and times, leading to several electron bunches with different peak energies. To create single electron bunches with low energy spread, experiments using localized ionization injection inside a capillary discharge waveguide were performed. A single injected bunch with energy 1.6GeV, charge 38 pC, divergence 1 mrad, and relative energy spread below 2% full-width half-maximum was produced in a 3.3cm-long capillary discharge waveguide. This development shows promise for mitigation of energy spread and future high efficiency staged acceleration experiments.
- ПубликацияТолько метаданныеDifference Schemes of Consistent Approximation of the Stress-Strain State and Energy Balance of a Medium(2020) Podryga, V. O.; Ladonkina, M. E.; Voloshin, A. S.; Boykov, D. S.; Poveshchenko, Y. A.; Gasilov, V. A.; Повещенко, Юрий Андреевич; Гасилов, Владимир Анатольевич© 2020, Pleiades Publishing, Ltd.Abstract: Using the support operator technique for two-dimensional problems of the elasticity theory we constructed integrally consistent approximations of the components of the strain tensor and the elastic energy of the medium for the equations of the elasticity theory in terms of displacements. Approximations are constructed for the case of irregular difference grids in the R–Z plane of a cylindrical coordinate system. We use the limiting process assuming that the azimuthal angle tends to zero for passing from the full three-dimensional approximations to the two-dimensional approximations in the R–Z plane. The used technique preserves the divergent form, self-adjointness, and sign-definiteness of the two-dimensional approximations. These properties are inherent in their 3D predecessors corresponding to the operators in the governing differential equations.
- ПубликацияТолько метаданныеCompletely Conservative Difference Schemes for Fluid Dynamics in a Piezoconductive Medium with Gas Hydrate Inclusions(2020) Podryga, V. O.; Rahimly, P. I.; Gasilov, V. A.; Poveshchenko, Y. A.; Гасилов, Владимир Анатольевич; Повещенко, Юрий Андреевич© 2019, Pleiades Publishing, Ltd.Abstract: The dynamics equations for a two-component fluid in a porous medium with gas hydrate inclusions are approximated on a structurally irregular difference grid. The case of a thermodynamically equilibrium model is considered. The support operator method is used to construct a family of completely conservative two-level difference schemes. The time approximation is based on expressions “weighted” according to grid time levels with weighting factors that generally vary in space. For a difference fluid dynamics problem, an algorithm based on splitting into physical processes is proposed.
- ПубликацияТолько метаданныеProgress in researching the implosion of nested arrays of mixed composition and the generation of soft X-ray power pulse(2022) Mitrofanov, K. N.; Aleksandrov, V. V.; Branitski, A. V.; Grabovskiy, E. V.; Gasilov, V. A.; Гасилов, Владимир Анатольевич© 2022 IOP Publishing Ltd.The results of experiments on the study of plasma compression of nested wire arrays of mixed composition and the generation of powerful pulses of soft X-ray radiation (SXR), carried out on a pulse power facility Angara-5-1 at a current level of up to 3 MA, are presented. Based on the latest experimental data on the intensity of plasma formation of various substances m˙ (in μg(cm2 ns)-1) (Mitrofanov et al 2020 Plasma Phys. Rep. 46 1150-80) and on the features of the dynamics of plasma compression in nested arrays (Mitrofanov et al 2018 Plasma Phys. Rep. 44 203-35), a nested wire array design has been developed which makes it possible to obtain a high peak SXR power in comparison with the known designs of single and nested tungsten wire arrays. During the implosion of nested arrays of mixed composition, consisting of plastic fibers and tungsten wires, shorter and more powerful SXR pulses were obtained with a maximum peak power P SXRmax∼10 TW with a full width at half maximum (FWHM) duration of ∼5 ns compared to the parameters of SXR pulses upon compression of single tungsten arrays: P SXRmax∼5 TW and FWHM ∼10 ns. Thus, under the conditions of our experiments, we have shown the possibility of a twofold increase in the peak SXR power during compression of nested arrays by optimizing their design.