Laboratory Simulations of the Radial Distribution of the Toroidal Magnetic Field in an Axial Jet from a Young Stellar Object

Krauz, V. I.; Mitrofanov, K. N.; Voĭtenko, D. A.; Astapenko, G. I.; Markoliya, A. I.; Timoshenko, Andrei P.

doi:10.1134/s1063772919020057

Cited by 11 publications

(5 citation statements)

References 28 publications

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“…This behavior of the magnetic field agrees with the model formulated in [20,23,30,31]. In this model the plasma flow is a dense core in which the axial current flows creating a holding toroidal magnetic field (fig.…”

supporting

confidence: 87%

“…The development of instabilities m = 0 may cause an interruption of current, reconnection of magnetic field lines, and formation of a plasmoid with a captured magnetic flux. The formation of such structures, including in gas-puff modes, using laser interferometry and magnetic probes, was shown earlier in [29][30][31][32]. Affected by the magnetic field gradient, this plasmoid is pushed out along the axis.…”

mentioning

confidence: 68%

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Generation of compact plasma objects in plasma focus discharge

Krauz

Paduch

Tomaszewski³

et al. 2020

EPL

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This paper provides the results of studies of plasma flows generated in the plasma focus facility PF-1000U. Regimes are found, involving the formation of compact plasma objects propagating in the variable-density background environment to the distances exceeding the initial crosswise dimensions of these objects by dozens of times. It is shown that the flow spreads with its proper captured toroidal magnetic field. The plasma flow front structure is studied. The conclusions about the role of radiation cooling and magnetic confinement in the collimation and stability of outflows are drawn. The results obtained in this work can be used to analyze the existing and build new models describing the collimation and stability of non-relativistic outflows of young stellar objects.

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supporting

confidence: 87%

mentioning

confidence: 68%

Generation of compact plasma objects in plasma focus discharge

Krauz

Paduch

Tomaszewski³

et al. 2020

EPL

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“…First experiments (Mitrofanov et al 2014(Mitrofanov et al , 2017aVoitenko et al 2017) showed that the observed plasma flows contain a strong (up to 10 kG) toroidal magnetic field, which decreases as 1/r n with distance r from the axis of the flow. 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.…”

Section: Introductionsupporting

confidence: 53%

“…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 .…”

Section: Introductionmentioning

confidence: 99%

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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“…Figure 1 shows the typical shape of the plasma outflow constructed from the magnetic probe measurements at the KPF-4 facility (Krauz et al 2019). In this experiment the radial distribution of the toroidal magnetic field was measured with a multichannel magnetic probe consisting of coils with a separation between the coil centers of 5-6 mm.…”

Section: Introductionmentioning

confidence: 99%

Internal Structure of the Jets from Young Stars Simulated at Plasma Focus Facilities

Beskin,

Kalashnikov

2020

Preprint

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The laboratory simulations of jets from young stars that have been carried out for many years at plasma focus facilities allow the internal structure of the active regions emerging during the interaction of the jet with the surrounding plasma to be studied in detail. We have found a new wide class of solutions for the equations of ideal magnetohydrodynamics describing the closed axisymmetric stationary flows that are apparently realized in the active regions. Such flows are shown to well reproduce the internal structure of the plasma structures observed in laboratory simulations of astrophysical jets.

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Laboratory Simulations of the Radial Distribution of the Toroidal Magnetic Field in an Axial Jet from a Young Stellar Object

Cited by 11 publications

References 28 publications

Generation of compact plasma objects in plasma focus discharge

Generation of compact plasma objects in plasma focus discharge

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

Internal Structure of the Jets from Young Stars Simulated at Plasma Focus Facilities

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