Персона: Голубев, Александр Александрович
Загружается...
Email Address
Birth Date
Организационные подразделения
Организационная единица
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.
Статус
Руководитель научной группы "Физика высокой плотности энергии в веществе при воздействии интенсивных ионных пучков"
Фамилия
Голубев
Имя
Александр Александрович
Имя
6 results
Результаты поиска
Теперь показываю 1 - 6 из 6
- ПубликацияОткрытый доступHigh-energy-density-science capabilities at the Facility for Antiproton and Ion Research(2020) Schoenberg, K.; Bagnoud, V.; Blazevic, A.; Fortov, V. E.; Golubev, A.; Голубев, Александр Александрович© 2020 Author(s).The Facility for Antiproton and Ion Research (FAIR) will employ the World's highest intensity relativistic beams of heavy nuclei to uniquely create and investigate macroscopic (millimeter-sized) quantities of highly energetic and dense states of matter. Four principal themes of research have been identified: properties of materials driven to extreme conditions of pressure and temperature, shocked matter and material equation of state, basic properties of strongly coupled plasma and warm dense matter, and nuclear photonics with a focus on the excitation of nuclear processes in plasmas, laser-driven particle acceleration, and neutron production. The research program, principally driven by an international collaboration of scientists, called the HED@FAIR collaboration, will evolve over the next decade as the FAIR project completes and experimental capabilities develop. The first programmatic research element, called "FAIR Phase 0, officially began in 2018 to test components, detectors, and experimental techniques. Phase-0 research employs the existing and enhanced infrastructure of the GSI Helmholtzzentrum für Schwerionenforschung (GSI) heavy-ion synchrotron coupled with the PHELIX high-energy, high-intensity laser. The "FAIR Day one" experimental program, presently scheduled to begin in 2025, commences the use of FAIR's heavy-ion synchrotron, coupled to new experimental and diagnostic infrastructure, to realize the envisaged high-energy-density-science research program.
- ПубликацияОткрытый доступApplied nuclear physics at the new high-energy particle accelerator facilities(2019) Durante, M.; Park, W. -Y.; Trautmann, C.; Golubev, A.; Голубев, Александр Александрович© 2019 The Author(s) Applied nuclear physics is an essential part of the research activity at many particle accelerators. New, large accelerator facilities are currently under construction in Europe, Asia, and USA. These machines will be able to produce radioactive ion beams, and to increase the intensity and the energy of the heavy ions well beyond the limits currently available at the therapy or research facilities. The upcoming facilities open new opportunities for research in biomedical applications that require these special properties, such as particle radiography, radioactive beam imaging, ultra-high dose rates and new ions for therapy. Moreover, space radiation research and materials science can successfully exploit these new centers. The new facilities can pave the way to many future applications of nuclear physics for the benefit of the society. In this paper we will summarize the current status of applied sciences at high-energy accelerators, describe the characteristics of some of the machines under construction (FAIR, NICA, RAON, ELI) and discuss the new opportunities offered by these facilities in applied sciences.
- ПубликацияТолько метаданныеMethod for Reconstructing Volume Density Distribution in Dynamic Targets in Proton Radiography Experiments(2019) Kolesnikov, D. S.; Kantsyrev, A. V.; Golubev, A. A.; Колесников, Дмитрий Сергеевич; Канцырев, Алексей Викторович; Голубев, Александр Александрович© 2019, Pleiades Publishing, Ltd.A method for reconstruction of the volume density distribution in dynamic targets from their proton radiography image is considered. The reconstruction can be carried out using the inverse Abel transform under the assumption that the studied object and processes have radial symmetry. To increase the accuracy of reconstructed data, algorithms for correction of basic types of distortions of proton radiography images are proposed. The results of processing experimental data obtained on proton radiography facilities PUMA at ITEP and PRIOR at GSI are presented.
- ПубликацияТолько метаданныеExpansion opacity in laboratory conditions(2021) Glazyrin, S. I.; Blinnikov, S. I.; Roudskoy, I. V.; Rosmej, O. N.; Golubev, A. A.; Pikuz, S. A.; Голубев, Александр Александрович© 2021 Author(s).Radiation-matter interaction depends mainly on the state of matter (its density, temperature, etc.), and also on the radiation spectrum. The opacity of thick plasma also depends on plasma velocity - the Doppler effect shifts atomic lines. For the cases when there are many bound-bound transitions, i.e., the plenty of lines contribute to the opacity, the latter is enhanced when the plasma expands with a nonuniform velocity field. It is known as "expansion opacity"in the literature. Existing models are discrepant and predict diverse results in some cases. Here, we present a rigorous derivation of the effect and show that the effect is available for experimental study at modern laser facilities. The plasma created by a Cu target irradiated with an ∼ 100 J nanosecond laser pulse is rich in lines and has enough expansion velocity so that its opacity is increased in the spectral range ∼ 10 2 - 10 3 eV by the order of magnitude. The possible experimental measurement of the effect is briefly discussed.
- ПубликацияТолько метаданныеBenchmark Experiment to Prove the Role of Projectile Excited States upon the Ion Stopping in Plasmas(2021) Zhao, Y. T.; Zhang, Y. N.; Cheng, R.; He, B.; Golubev, A. A.; Hoffmann, D. H. H.; Голубев, Александр Александрович© 2021 American Physical Society.We report on a precision energy loss measurement and theoretical investigation of 100 keV/u helium ions in a hydrogen-discharge plasma. Collision processes of helium ions with protons, free electrons, and hydrogen atoms are ideally suited for benchmarking plasma stopping-power models. Energy loss results of our experiments are significantly higher than the predictions of traditional effective charge models. We obtained good agreement with our data by solving rate equations, where in addition to the ground state, also excited electronic configurations were considered for the projectile ions. Hence, we demonstrate that excited projectile states, resulting from collisions, leading to capture-, ionization-, and radiative-decay processes, play an important role in the stopping process in plasma.
- ПубликацияТолько метаданныеDynamics of supernova bounce in laboratory(2019) Blinnikov, S. I.; Ilkaev, R. I.; Mochalov, M. A.; Mikhailov, A. L.; Glazyrin, S. I.; Golubev, A. A.; Голубев, Александр АлександровичWe draw attention to recent high-explosive (HE) experiments which provide compression of macroscopic amount of matter to high, even record, values of pressure in comparison with other HE experiments. The observed bounce after the compression corresponds to processes in core-collapse supernova explosions after neutrino trapping. Conditions provided in the experiments resemble those in core-collapse supernovae, permitting their use for laboratory astrophysics. A unique feature of the experiments is compression at low entropy. The values of specific entropy are close to those obtained in numerical simulations during the process of collapse in supernova explosions, and much lower than those obtained at laser ignition facilities, another type of high-compression experiment. Both in supernovae and HE experiments the bounce occurs at low entropy, so the HE experiments provide a new platform to realize some supernova collapse effects in laboratory, especially to study hydrodynamics of collapsing flows and the bounce. Due to the good resolution of diagnostics in the compression of macroscopic amounts of material with essential effects of non ideal plasma in EOS, and observed development of 3D instabilities, these experiments may serve as a useful benchmark for astrophysical hydrodynamic codes.