Laboratory Simulation of the Dynamics of a Dense Plasma Cloud Expanding in a Magnetized Background Plasma on a Krot Large-Scale Device

Gushchin, M. E.; Korobkov, S. V.; Terekhin, V. A.; Strikovskiy, A. V.; Gundorin, V. I.; Zudin, I. Yu.; Aidakina, N. A.; Nikolenko, A. D.

doi:10.1134/s0021364018180054

Cited by 11 publications

(4 citation statements)

References 13 publications

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“…The plasma flow was injected into the vacuum at the residual air pressure p 0 ∼ 3 -50 µ Torr and propagated in the ambient Bfield having strength from 45 to 450 G. The overall set-up, illustrated in Figure 2, is similar to that of the high-power laser experiment. The plasma was generated by a "cable gun" made of a 50 Ohm coaxial cable with a polyethylene insulator (Gushchin et al 2018;Korobkov et al 2019). The gun was installed at the centre of the area of the quasi-uniform magnetic field.…”

Section: Using a Plasma Gun At The Krot Facilitymentioning

confidence: 99%

Inferring possible magnetic field strength of accreting inflows in EXor-type objects from scaled laboratory experiments

Burdonov,

Bonito,

Giannini

et al. 2021

Preprint

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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.

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Section: Using a Plasma Gun At The Krot Facilitymentioning

confidence: 99%

Inferring possible magnetic field strength of accreting inflows in EXor-type objects from scaled laboratory experiments

Burdonov,

Bonito,

Giannini

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…2, is similar to that of the high-power laser experiment. The plasma was generated by a "cable gun" made of a 50 Ohm coaxial cable with a polyethylene insulator (Gushchin et al 2018;Korobkov et al 2019). The gun was installed at the centre of the area of the quasi-uniform magnetic field.…”

Section: Using a Plasma Gun At The Krot Facilitymentioning

confidence: 99%

“…Several diagnostics were used to measure the plasma parameters (Gushchin et al 2018). The self-emission from the plasma stream was recorded, using a 4Picos fast shutter camera, along two directions, parallel and perpendicular to the B-field lines axis.…”

Section: Using a Plasma Gun At The Krot Facilitymentioning

confidence: 99%

Inferring possible magnetic field strength of accreting inflows in EXor-type objects from scaled laboratory experiments

Burdonov

Bonito

Giannini

et al. 2021

A&A

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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.

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“…Figure 1 shows the relationship between the plasma deceleration radius (1) and the values of the external magnetic field induced at energies E0 = 1-100 J, which are typical for laboratory laser-plasma experiments. A significant number of experimental studies of the interaction of plasma clouds with an external magnetic field are performed at B0 ~ 100 -1000 G [15][16][17]. In this case, the characteristic dimensions of the plasma cloud lie in the range Rb ~ 10 cm -1 m and the characteristic plasma densities turn out to be of the order of 10 14 cm -3 .…”

Section: Justification Of the Parameters Of The Magnetic System For A...mentioning

confidence: 99%

Pulsed magnetic field generation system for laser-plasma research

Лучинин¹,

Малышев²,

Kopelovich³

et al. 2021

Review of Scientific Instruments

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An up to 15 T pulsed magnetic field generator in a volume of a few cubic centimeters has been created for experiments with magnetized laser plasma. The magnetic field is created by a pair of coils placed in a sealed reservoir with liquid nitrogen, which is installed in a vacuum chamber with a laser target. The bearing body provides the mechanical strength of the system both in the case of co-directional and oppositely connected coils. The configuration of the housing allows laser radiation to be introduced into the working area between the coils in a wide range of directions and focusing angles, to place targets away from the symmetry axis of the magnetic system, and to irradiate several targets simultaneously.

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Laboratory Simulation of the Dynamics of a Dense Plasma Cloud Expanding in a Magnetized Background Plasma on a Krot Large-Scale Device

Cited by 11 publications

References 13 publications

Inferring possible magnetic field strength of accreting inflows in EXor-type objects from scaled laboratory experiments

Inferring possible magnetic field strength of accreting inflows in EXor-type objects from scaled laboratory experiments

Inferring possible magnetic field strength of accreting inflows in EXor-type objects from scaled laboratory experiments

Pulsed magnetic field generation system for laser-plasma research

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