Simulation of Physical Phenomena in the Ionosphere and Magnetosphere of the Earth on Krot Plasma Device. Some Results and Prospects

Aidakina, N. A.; Galka, A. G.; Gundorin, V. I.; Gushchin, M. E.; Zudin, I. Yu.; Korobkov, S. V.; Костров, А. В.; Loskutov, K. N.; Mogilevskiy, M. M.; Priver, S. E.; Strikovskiy, A. V.; Чугунин, Д. В.; Yanin, D. V.

doi:10.1134/s0016793218030027

Cited by 15 publications

(5 citation statements)

References 27 publications

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“…The experiments were performed using the gigantic coaxial line (GCL) [19,20] installed inside the chamber of the large-scale Krot plasma device (Figure 1). This device is used for simulating space plasma and is described in detail in [18]. It is a vacuum chamber with a volume of about 170 cubic meters, in which a large quasiuniform plasma column can be produced using several pulsed radio-frequency (rf) generators.…”

Section: Description Of the Experimentsmentioning

confidence: 99%

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Transformation of the Shape and Spectrum of an Ultrawideband Electromagnetic Pulse in a “Gigantic” Coaxial Line Filled with Magnetized Plasma

Zudin,

Gushchin,

Korobkov

et al. 2024

Applied Sciences

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A propagation of ultrawideband electromagnetic pulses (UWB EMPs) through magnetized plasma has been experimentally studied using a “gigantic” coaxial line, which has been developed at IAP RAS for laboratory modeling of ionospheric effects. This coaxial line is 1.4 m in diameter and 10 m in length and is installed inside the chamber of the large-scale Krot plasma device. The line can be filled with rf inductively coupled plasma, magnetized or not. It allows one to explore the propagation of UWB EMPs in plasma along a long path without refraction and divergence and obtain a physical picture of EMP transformation. Under conditions where the duration of the UWB EMP is comparable to the period of electron plasma oscillations (fp−1), the period of cyclotron rotation of electrons (fc−1), or even significantly shorter, a complex of effects of transformation of the waveform and frequency spectrum of the pulse occurs. Without ambient magnetic field, a UWB EMP is distorted due to the effects of the cutoff and frequency dispersion. In dense magnetized plasma, i.e., when fp >> fc, the UWB EMP breaks into two wave packets, the high-frequency one (f > fp) and low-frequency one (f < fc). In rare magnetized plasma (fp << fc), the cyclotron absorption produces a long train of damped oscillations at a frequency close to the cyclotron frequency fc following the UWB EMP.

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Section: Description Of the Experimentsmentioning

confidence: 99%

“…In Russia, the largest device for simulation of physical phenomena in the atmosphere and ionosphere is the Krot device at the Institute of Applied Physics of the Russian Academy of Sciences [18]. Recently, a new scientific instrument (a "gigantic" plasma-filled coaxial line, GCL) has been added to this device.…”

Section: Introductionmentioning

confidence: 99%

Transformation of the Shape and Spectrum of an Ultrawideband Electromagnetic Pulse in a “Gigantic” Coaxial Line Filled with Magnetized Plasma

Zudin,

Gushchin,

Korobkov

et al. 2024

Applied Sciences

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“…The large-scale (volume of 170 m 3 ) KROT device (Aidakina et al 2018) is the space plasma simulation chamber designed and constructed at the IAP RAS, Nizhny Novgorod (Russia). The chamber is equipped with a pulsed solenoid for the magnetic field generation and a pulsed radio frequency (RF) source of inductively coupled background plasma.…”

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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“…The KROT facility, designed to model physical phenomena in the ionosphere and space environment, is one of the largest plasma facilities available [21]. The core of the facility is a vacuum chamber that has a volume of 180 m 3 and a diameter of 3 m, where the residual gas pressure reaches a level of 1 µTorr.…”

Section: Large-scale Coaxial Linementioning

confidence: 99%

“…Nanosecond voltage having amplitudes up to 250 kV can be generated by RADAN generators [24]. Alum end sections 2, 3 and 4 of the tapered transitions (see Figure 1) are made solid, The coaxial line is filled with plasma by means of a standard pair of inductor antennas [21], brought into the gap between the outer and inner conductors (not shown in Figure 1). The maximum density of the plasma, which can be obtained in the case of a pulsed breakdown of a working gas (argon, nitrogen, or air) under a pressure of 10 −4 -10 −2 Torr in the absence of an ambient magnetic field, exceeds 10 11 cm −3 [20].…”

Section: Large-scale Coaxial Linementioning

confidence: 99%

Gigantic Coaxial Line for Experimental Studies of the Interaction of Nanosecond Electromagnetic Pulses with an Ionized Gas Medium

et al. 2021

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A large-scale coaxial line filled with the plasma of RF discharge has been developed for laboratory modeling of the effects of the interaction of ultrashort electromagnetic pulses (EMPs) with the atmosphere and the ionosphere in the KROT facility. The oversized coaxial line ensures pulse transmission through an ionized medium in the TEM mode, which corresponds to the polarization of the transverse electromagnetic wave in free space, and in uniform isotropic plasma. The coaxial line has a length of 10 m and a diameter of 140 cm. The processes of propagation of the nanosecond and subnanosecond pulses in this line, in vacuum and with plasma, have been simulated numerically.

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Simulation of Physical Phenomena in the Ionosphere and Magnetosphere of the Earth on Krot Plasma Device. Some Results and Prospects

Cited by 15 publications

References 27 publications

Transformation of the Shape and Spectrum of an Ultrawideband Electromagnetic Pulse in a “Gigantic” Coaxial Line Filled with Magnetized Plasma

Transformation of the Shape and Spectrum of an Ultrawideband Electromagnetic Pulse in a “Gigantic” Coaxial Line Filled with Magnetized Plasma

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

Gigantic Coaxial Line for Experimental Studies of the Interaction of Nanosecond Electromagnetic Pulses with an Ionized Gas Medium

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