14 results on '"Zemskov, R."'
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2. Particle energization in colliding subcritical collisionless shocks investigated in the laboratory
- Author
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Fazzini, A., Yao, W., Burdonov, K., Béard, J., Chen, S. N., Ciardi, A., d'Humières, E., Diab, R., Filippov, E. D., Kisyov, S., Lelasseux, V., Miceli, M., Moreno, Q., Orlando, S., Pikuz, S., Ribeyre, X., Starodubtsev, M., Zemskov, R., and Fuchs, J.
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Physics - Plasma Physics - Abstract
Colliding collisionless shocks appear in a great variety of astrophysical phenomena and are thought to be possible sources of particle acceleration in the Universe. To investigate the detailed dynamics of this phenomenon, we have performed a dedicated laboratory experiment. We have generated two counter-streaming subcritical collisionless magnetized shocks by irradiating two teflon (CF$_2$) targets with 100 J, 1 ns laser beams on the LULI2000 laser facility. The interaction region between the plasma flows was pre-filled with a low density background hydrogen plasma and initialized with an externally applied homogeneous magnetic field perpendicular to the shocks. We report here on measurements of the plasma density and temperature during the formation of the supercritical shocks, their transition to subcritical, and final interpenetration. We have also modeled the macroscopic evolution of the system via hydrodynamic simulations and the microphysics at play during the interaction via Particle-In-Cell simulations. The main goal was to understand what was the effect of the second shock on particle energization. We found that in the presence of two shocks the ambient ions reach energies around 1.5 times of the ones obtained with single shocks. Both the presence of the downstream zone of the second shock and of the downstream zone common for the two shocks play a role in the different energization: the characteristics of the perpendicular electric fields in the two areas allow, indeed, certain particles to keep being accelerated or to avoid being decelerated.
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- 2022
- Full Text
- View/download PDF
3. Inferring possible magnetic field strength of accreting inflows in EXor-type objects from scaled laboratory experiments
- Author
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Burdonov, K., Bonito, R., Giannini, T., Aidakina, N., Argiroffi, C., Beard, J., Chen, S. N., Ciardi, A., Ginzburg, V., Gubskiy, K., Gundorin, V., Gushchin, M., Kochetkov, A., Korobkov, S., Kuzmin, A., Kuznetsov, A., Pikuz, S., Revet, G., Ryazantsev, S., Shaykin, A., Shaykin, I., Soloviev, A., Starodubtsev, M., Strikovskiy, A., Yao, W., Yakovlev, I., Zemskov, R., Zudin, I., Khazanov, E., Orlando, S., and Fuchs, J.
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
Aims. EXor-type objects are protostars that display powerful UV-optical outbursts caused by intermittent and powerful events of magnetospheric accretion. These objects are not yet well investigated and are quite difficult to characterize. Several parameters, such as plasma stream velocities, characteristic densities, and temperatures, can be retrieved from present observations. As of yet, however, there is no information about the magnetic field values and the exact underlying accretion scenario is also under discussion. Methods. We use laboratory plasmas, created by a high power laser impacting a solid target or by a plasma gun injector, and make these plasmas propagate perpendicularly to a strong external magnetic field. The propagating plasmas are found to be well scaled to the presently inferred parameters of EXor-type accretion event, thus allowing us to study the behaviour of such episodic accretion processes in scaled conditions. Results. We propose a scenario of additional matter accretion in the equatorial plane, which claims to explain the increased accretion rates of the EXor objects, supported by the experimental demonstration of effective plasma propagation across the magnetic field. In particular, our laboratory investigation allows us to determine that the field strength in the accretion stream of EXor objects, in a position intermediate between the truncation radius and the stellar surface, should be of the order of 100 gauss. This, in turn, suggests a field strength of a few kilogausses on the stellar surface, which is similar to values inferred from observations of classical T Tauri stars.
- Published
- 2021
- Full Text
- View/download PDF
4. Experimental Study of Terahertz Radiation Generation in the Interaction of Ultrashort Laser Pulse with Gas Targets
- Author
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Zemskov, R. S., Perevalov, S. E., Kotov, A. V., Bodrov, S. B., Stepanov, A. N., Solov’ev, A. A., Bakunov, M. I., Luchinin, A. G., Ginzburg, V. N., Kuz’min, A. A., Yakovlev, I. V., Stukachev, S. E., Kochetkov, A. A., Shaikin, I. A., Shaykin, A. A., Khazanov, E. A., Glyavin, M. Yu., Chekmarev, N. V., Vodop’yanov, A. V., and Starodubtsev, M. V.
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- 2023
- Full Text
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5. Features of Dynamics and Instability of Plasma Jets Expanding into an External Magnetic Field in Laboratory Experiments with Compact Coaxial Plasma Generators on a Large-Scale “Krot” Stand
- Author
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Korobkov, S. V., Nikolenko, A. S., Gushchin, M. E., Strikovsky, A. V., Zudin, I. Yu., Aidakina, N. A., Shaikhislamov, I. F., Rumenskikh, M. S., Zemskov, R. S., and Starodubtsev, M. V.
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- 2023
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6. Experimental Study of the Interaction of a Laser Plasma Flow with a Transverse Magnetic Field
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Soloviev, A. A., Burdonov, K. F., Kotov, A. V., Perevalov, S. E., Zemskov, R. S., Ginzburg, V.N., Kochetkov, A. A., Kuzmin, A. A., Shaikin, A. A., Shaikin, I. A., Khazanov, E. A., Yakovlev, I. V., Luchinin, A. G., Morozkin, M.V., Proyavin, M. D., Glyavin, M.Yu., Fuchs, J., and Starodubtsev, M.V.
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- 2021
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7. Laboratory modeling of YSO jets collimation by a large-scale divergent interstellar magnetic field.
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Zemskov, R., primary, Burdonov, K., additional, Soloviev, A., additional, Sladkov, A., additional, Korzhimanov, A., additional, Fuchs, J., additional, Bisikalo, D., additional, Zhilkin, A., additional, Barkov, M., additional, Ciardi, A., additional, Yao, W., additional, Glyavin, M., additional, Morozkin, M., additional, Proyavin, M., additional, Luchinin, A., additional, Chuvakin, P., additional, Ginzburg, V., additional, Kochetkov, A., additional, Kuzmin, A., additional, Shaykin, A., additional, Shaikin, I., additional, Perevalov, S., additional, Kotov, A., additional, Pikuz, S., additional, Ryazantsev, S., additional, Khazanov, E., additional, and Starodubtsev, M., additional
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- 2023
- Full Text
- View/download PDF
8. Features of Dynamics and Instability of Plasma Jets Expanding into an External Magnetic Field in Laboratory Experiments with Compact Coaxial Plasma Generators on a Large-Scale “Krot” Stand
- Author
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Korobkov, S. V., primary, Nikolenko, A. S., additional, Gushchin, M. E., additional, Strikovsky, A. V., additional, Zudin, I. Yu., additional, Aidakina, N. A., additional, Shaikhislamov, I. F., additional, Rumenskikh, M. S., additional, Zemskov, R. S., additional, and Starodubtsev, M. V., additional
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- 2023
- Full Text
- View/download PDF
9. Particle energization in colliding subcritical collisionless shocks investigated in the laboratory
- Author
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Fazzini, A., primary, Yao, W., additional, Burdonov, K., additional, Béard, J., additional, Chen, S. N., additional, Ciardi, A., additional, d’Humières, E., additional, Diab, R., additional, Filippov, E. D., additional, Kisyov, S., additional, Lelasseux, V., additional, Miceli, M., additional, Moreno, Q., additional, Orlando, S., additional, Pikuz, S., additional, Ribeyre, X., additional, Starodubtsev, M., additional, Zemskov, R., additional, and Fuchs, J., additional
- Published
- 2022
- Full Text
- View/download PDF
10. Numerical investigation of spallation neutrons generated from petawatt-scale laserdriven proton beams
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Soloviev, A., Burdonov, K., Kotov, A., Perevalov, S., Zemskov, R., Ginzburg, V.N., Kochetkov, A., Kuzmin, A., Shaikin, A., Shaikin, I., Khazanov, E., Yakovlev, I., Luchinin, A., Morozkin, M.V., Proyavin, M., Glyavin, M.Yu., Fuchs, J., Starodubtsev, M.V., Laboratoire pour l'utilisation des lasers intenses (LULI), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
[PHYS.PHYS.PHYS-PLASM-PH]Physics [physics]/Physics [physics]/Plasma Physics [physics.plasm-ph] - Abstract
International audience; Laser-driven neutron sources could offer a promising alternative to those based on conventional accelerator technologies in delivering compact beams of high brightness and short duration. We examine this through particle-in-cell and Monte Carlo simulations, that model, respectively, the laser acceleration of protons from thin-foil targets and their subsequent conversion into neutrons in secondary lead targets. Laser parameters relevant to the 0.5 petawatt (PW) LMJ-PETAL and 0.6-6 PW Apollon systems are considered. Due to its high intensity, the 20-fs-duration 0.6 PW Apollon laser is expected to accelerate protons up to above 100 MeV, thereby unlocking efficient neutron generation via spallation reactions. As a result, despite a 30-fold lower pulse energy than the LMJ-PETAL laser, the 0.6 PW Apollon laser should perform comparably well both in terms of neutron yield and flux. Notably, we predict that very compact neutron sources, of ~ 10 ps duration and ~ 100 µm spot size, can be released provided the lead convertor target is thin enough (~ 100 µm). These sources are characterized by extreme fluxes, of the order of 10 23 n cm-2 s-1 , and even ten times higher when using the 6 PW Apollon laser. Such values surpass those currently achievable at large-scale accelerator-based neutron sources (~ 10 16 n cm-2 s-1), or reported from previous laser experiments using low-Z converters (~ 10 18 n cm-2 s-1). By showing that such laser systems can produce neutron pulses significantly brighter than existing sources, our findings open a path towards attractive novel applications, such as flash neutron radiography or laboratory studies of heavy-ion nucleosynthesis.
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- 2021
- Full Text
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11. Laboratory modelling of equatorial ‘tongue’ accretion channels in young stellar objects caused by the Rayleigh-Taylor instability
- Author
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Burdonov, K., primary, Yao, W., additional, Sladkov, A., additional, Bonito, R., additional, Chen, S.N., additional, Ciardi, A., additional, Korzhimanov, A., additional, Soloviev, A., additional, Starodubtsev, M., additional, Zemskov, R., additional, Orlando, S., additional, Romanova, M., additional, and Fuchs, J., additional
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- 2022
- Full Text
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12. Inferring possible magnetic field strength of accreting inflows in EXor-type objects from scaled laboratory experiments
- Author
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Burdonov, K., primary, Bonito, R., additional, Giannini, T., additional, Aidakina, N., additional, Argiroffi, C., additional, Béard, J., additional, Chen, S. N., additional, Ciardi, A., additional, Ginzburg, V., additional, Gubskiy, K., additional, Gundorin, V., additional, Gushchin, M., additional, Kochetkov, A., additional, Korobkov, S., additional, Kuzmin, A., additional, Kuznetsov, A., additional, Pikuz, S., additional, Revet, G., additional, Ryazantsev, S., additional, Shaykin, A., additional, Shaykin, I., additional, Soloviev, A., additional, Starodubtsev, M., additional, Strikovskiy, A., additional, Yao, W., additional, Yakovlev, I., additional, Zemskov, R., additional, Zudin, I., additional, Khazanov, E., additional, Orlando, S., additional, and Fuchs, J., additional
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- 2021
- Full Text
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13. Inferring possible magnetic field strength of accreting inflows in EXor-type objects from scaled laboratory experiments
- Author
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Mikhail Gushchin, Rosaria Bonito, K. Gubskiy, Efim A. Khazanov, Julien Fuchs, A. V. Strikovskiy, V. I. Gundorin, A. Kuznetsov, S. N. Ryazantsev, S. A. Pikuz, Salvatore Orlando, Alexander Soloviev, W. P. Yao, I. Shaykin, Teresa Giannini, R. Zemskov, Ivan V. Yakovlev, Shihua Chen, N. A. Aidakina, I. Zudin, Andrey Shaykin, M. V. Starodubtsev, Vladislav Ginzburg, K. Burdonov, A. A. Kuzmin, J. Béard, G. Revet, A. A. Kochetkov, Andrea Ciardi, S. V. Korobkov, Costanza Argiroffi, Laboratoire pour l'utilisation des lasers intenses (LULI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), Laboratoire national des champs magnétiques intenses - Toulouse (LNCMI-T), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Institute of Applied Physics of RAS, Russian Academy of Sciences [Moscow] (RAS), INAF - Osservatorio Astronomico di Palermo (OAPa), Istituto Nazionale di Astrofisica (INAF), INAF - Osservatorio Astronomico di Roma (OAR), Università degli studi di Palermo - University of Palermo, Horia Hulubei National Institute for Physics and Nuclear Engineering, Moscow State Engineering Physics Institute (MEPhI), Joint Institute for High Temperatures of the RAS (JIHT), The National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) [Moscow, Russia], This work was partly done within the LABEX Plas@Par, the DIM ACAV funded by the Region Ile-de-France, and supported by Grant No. 11-IDEX- 0004-02 from ANR, The research leading to these results is supported by Extreme Light Infrastructure Nuclear Physics (ELINP) Phase II, a project co-financed by the Romanian Government and European Union through the European Regional Development Fund, and by the project ELI-RO-2020-23 funded by IFA (Romania)., European Project: ERC787539,GENESIS, Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), HEP, INSPIRE, Burdonov K., Bonito R., Giannini T., Aidakina N., Argiroffi C., Beard J., Chen S.N., Ciardi A., Ginzburg V., Gubskiy K., Gundorin V., Gushchin M., Kochetkov A., Korobkov S., Kuzmin A., Kuznetsov A., Pikuz S., Revet G., Ryazantsev S., Shaykin A., Shaykin I., Soloviev A., Starodubtsev M., Strikovskiy A., Yao W., Yakovlev I., Zemskov R., Zudin I., Khazanov E., Orlando S., and Fuchs J.
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Shock wave ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Field strength ,Astrophysics ,stars: pre-main sequence ,01 natural sciences ,magnetohydrodynamics (MHD) ,Settore FIS/05 - Astronomia E Astrofisica ,accretion ,0103 physical sciences ,Protostar ,Astrophysics::Solar and Stellar Astrophysics ,010306 general physics ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) ,Astrophysics::Galaxy Astrophysics ,High Energy Astrophysical Phenomena (astro-ph.HE) ,Physics ,[PHYS]Physics [physics] ,accretion disks ,Astronomy and Astrophysics ,Radius ,Plasma ,shock waves ,Accretion, accretion disks ,Accretion (astrophysics) ,Magnetic field ,T Tauri star ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,instabilities ,stars: individual: V1118 Ori ,Astrophysics::Earth and Planetary Astrophysics ,[PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph] ,Astrophysics - High Energy Astrophysical Phenomena ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] - Abstract
Aims. EXor-type objects are protostars that display powerful UV-optical outbursts caused by intermittent and powerful events of magnetospheric accretion. These objects are not yet well investigated and are quite difficult to characterize. Several parameters, such as plasma stream velocities, characteristic densities, and temperatures, can be retrieved from present observations. As of yet, however, there is no information about the magnetic field values and the exact underlying accretion scenario is also under discussion. Methods. We use laboratory plasmas, created by a high power laser impacting a solid target or by a plasma gun injector, and make these plasmas propagate perpendicularly to a strong external magnetic field. The propagating plasmas are found to be well scaled to the presently inferred parameters of EXor-type accretion event, thus allowing us to study the behaviour of such episodic accretion processes in scaled conditions. Results. We propose a scenario of additional matter accretion in the equatorial plane, which claims to explain the increased accretion rates of the EXor objects, supported by the experimental demonstration of effective plasma propagation across the magnetic field. In particular, our laboratory investigation allows us to determine that the field strength in the accretion stream of EXor objects, in a position intermediate between the truncation radius and the stellar surface, should be of the order of 100 G. This, in turn, suggests a field strength of a few kilogausses on the stellar surface, which is similar to values inferred from observations of classical T Tauri stars.
- Published
- 2021
- Full Text
- View/download PDF
14. Improving focusability of post-compressed PW laser pulses using a deformable mirror.
- Author
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Soloviev A, Kotov A, Martyanov M, Perevalov S, Zemskov R, Starodubtsev M, Alexandrov A, Galaktionov I, Samarkin V, Kudryashov A, Yakovlev I, Ginzburg V, Kochetkov A, Shaikin I, Kuzmin A, Stukachev S, Mironov S, Shaykin A, and Khazanov E
- Abstract
The use of the post-compression technique ensures gain in laser pulse peak power but at the same time degrades beam focusability due to the nonlinear wavefront distortions caused by a spatially nonuniform beam profile. In this paper a substantial focusability improvement of a post-compressed laser pulse by means of adaptive optics was demonstrated experimentally. The Strehl ratio increase from 0.16 to 0.43 was measured. Simulations showed that the peak intensity in this case reaches 0.52 of the theoretical limit.
- Published
- 2022
- Full Text
- View/download PDF
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