Simulation of Nonrelativistic Jet Ejections During the Laboratory Studies

Бескин, В. С.; Istomin, Ya. N.; Kiselev, A. M.; Krauz, V. I.; Mitrofanov, K. N.; Myalton, V. V.; Nokhrina, E. E.; Sob’yanin, D. N.; Kharrasov, A. M.

doi:10.1007/s11141-017-9760-8

Cited by 18 publications

(8 citation statements)

References 33 publications

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“…It was found that the compact plasma jets moving along the axis occur at the stage of the pinch decay and developing the MHD instabilities (Fig. 3) [11,12,13]. The initial jet velocity, determined from a series of successive snapshots in a frame mode, V 0 ≥ 10 7 cm/s, regardless of the operating gas used.…”

Section: Plasma Focusmentioning

confidence: 99%

Laboratory simulation of astrophysical jets within facilities of plasma focus type

Krauz

Бескин

Velikhov

2018

Int. J. Mod. Phys. D

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A laboratory simulation of astrophysical processes is one of the intensively developed areas of plasma physics. A new series of experiments has been launched recently on the Plasma Focus type facility in NRC Kurchatov Institute. The main goal is to study the mechanisms of the jet stabilization, due to which it can propagate at distances much greater than their transverse dimensions. The experiments with stationary gas filling revealed regimes in which a narrowly collimated plasma jet was formed, the head of which was no wider than several centimeters at jet propagation distances of up to 100 cm. The PF-1000 (IFPiLM, Warsaw, Poland) and KPF-4 (SFTI, Sukhum, Abkhazia) experiments are aimed at creating profiled initial gas distributions to control the conditions of plasma jet propagation in the ambient plasma. Estimations of the dimensionless parameters, i.e. the Mach, Reynolds, and Peclet numbers which were achieved during the experiments, showed that the PF-facilities can be used for the YSO jets modelling. The future experiments, which can allow one to understand the nature of the stable plasma ejections observed in many astrophysical sources, are discussed.

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Section: Plasma Focusmentioning

confidence: 99%

Laboratory simulation of astrophysical jets within facilities of plasma focus type

Krauz

Бескин

Velikhov

2018

Int. J. Mod. Phys. D

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“…Indications were also found that current closure occurs on the periphery of the flow itself (Krauz et al 2019). Finally, the morphology of the areas of interaction between the plasma ejections and the working gases filling the chamber was indeed close to the structure of the characteristic regions observed both in non-relativistic (Herbig-Haro objects) and relativistic (so-called radio lobes) astrophysical objects (Beskin et al 2017a;Krauz et al 2017Krauz et al , 2018. Therefore, it seems extremely important to conduct further detailed studies to clarify the role of the external environment and the details of the structure in the areas of interaction with the external environment.…”

Section: Introductionmentioning

confidence: 51%

“…Finally, the morphology of the areas of interaction between the plasma ejections and the working gases filling the chamber was indeed close to the structure of the characteristic regions observed both in non-relativistic (Herbig–Haro objects) and relativistic (so-called radio lobes) astrophysical objects (Beskin et al . 2017 a ; Krauz et al. 2017, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Devices of the 'plasma focus' (PF) type (Filippov, Filippova & Vinogradov 1962;Mather 1965) appear to be very promising to achieve this goal. PF facilities are known as sources of intense plasma flows, which are widely used in various fields, including the modelling of astrophysical processes (Mourenas et al 2003;Beskin et al 2017a;Krauz, Beskin & Velikhov 2018).…”

Section: Introductionmentioning

confidence: 99%

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Properties of toroidal magnetic fields in axial plasma flow on the PF-1000U plasma focus facility

et al. 2020

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This paper presents the results of studies of plasma flow parameters on the PF-1000U facility. A distinctive feature of this facility is the ability to create profiled initial gas distributions using gas puffs. In the experiments described, a combined system for filling the vacuum chamber with a working gas was used, in which an additional injection of various gases (deuterium, helium, neon and their mixtures) into the axial region of the chamber prefilled with deuterium was performed using a pulse valve. Thus, both the pinching processes and, accordingly, the generation of axial plasma flows and the conditions of their propagation in the background gas of the facility chamber were affected. Regimes with the generation of compact stable plasma formations propagating over long distances were found. The results obtained can be used in laboratory modelling of astrophysical jets from young stellar objects.

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“…Figure2. Photos of the plasma stream front according to[14] at a distance of z = 35 cm from the anode in a discharge in hydrogen (a) and neon (b), as well as in a discharge in neon at a distance of 65 cm (c). The scale of one cell is 1 cm.…”

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confidence: 99%

The collimated propagation causes of astrophysical and laboratory jets

Kalashnikov,

Dodin,

Il'ichev

et al. 2021

Preprint

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The use of Z-pinch facilities makes it possible to carry out well-controlled and diagnosable laboratory experiments to study laboratory jets with scaling parameters close to those of the jets from young stars. This makes it possible to observe processes that are inaccessible to astronomical observations. Such experiments are carried out at the PF-3 facility ("plasma focus," Kurchatov Institute), in which the emitted plasma emission propagates along the drift chamber through the environment at a distance of one meter. The paper presents the results of experiments with helium, in which a successive release of two ejections was observed. An analysis of these results suggests that after the passage of the first supersonic ejection, a region with a low concentration is formed behind it, the so-called vacuum trace, due to which the subsequent ejection practically does not experience environmental resistance and propagates being collimated. The numerical modeling of the propagation of two ejections presented in the paper confirms this point of view. Using scaling laws and appropriate numerical simulations of astrophysical ejections, it is shown that this effect can also be significant for the jets of young stars.

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Simulation of Nonrelativistic Jet Ejections During the Laboratory Studies

Cited by 18 publications

References 33 publications

Laboratory simulation of astrophysical jets within facilities of plasma focus type

Laboratory simulation of astrophysical jets within facilities of plasma focus type

Properties of toroidal magnetic fields in axial plasma flow on the PF-1000U plasma focus facility

The collimated propagation causes of astrophysical and laboratory jets

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