Askold V. Strikovsky

Propagation of whistlers in a plasma with a magnetic field duct

The propagation of whistlers in a homogeneous magnetized plasma in the presence of a magnetic field duct has been experimentally investigated. The possibility of efficiently trapping whistlers in a narrow (wavelength-scale) cylindrical duct with the increased field has been demonstrated. It has been shown that a comparatively slight perturbation of the external magnetic field (δB/B0 ∼ 0.1) can significantly change the spatial structure and increase the amplitude of whistlers near the duct axis.

Compression of whistler waves in a plasma with a nonstationary magnetic field

We present the results of our experiments in which the propagation of whistler waves in a plasma with a nonstationary magnetic-field perturbation (B=B0+δB(t), δB/B0 ≤ 5%) was investigated. The parametric and dispersive phenomena in a variable magnetic field were studied on the unique Krot plasma bench (the plasma column was 4 m in length and 1.5 m in diameter). A periodic field perturbation is shown to lead to an amplitude-frequency modulation of the whistler wave and to fragmentation of the signal into separate frequency-modulated wavepackets followed by their compression. The formation and compression of pulses is attributable to strong whistler group-velocity dispersion near the electron cyclotron frequency (ω ≤ ωH). The results can be used to interpret the spectral shapes of the signals received from the Earth’s magnetosphere and ionosphere in the electron and ion whistler frequency ranges.

Basic plasma physics experiments and modeling of space phenomena on a large inductively coupled magnetoplasma device

Large KROT device is developed for modeling of space plasma physics phenomena and studies of interaction of super‐strong electromagnetic radiation with plasmas. The core of the facility is pulsed RF plasma source with MW power level. Well repeated and highly uniform plasma, magnetized or not, can be produced in a volume of several tens of cubic meters. An overview of the facility operational parameters is presented along with the results of recent experiments.

Electrodynamic control of wave emission in the whistler frequency range by a loop antenna in magnetized plasma

An electrodynamic control of operation of a loop antenna used for the excitation and reception of waves in the whistler frequency range is proposed. According to the proposed method, a direct current producing local perturbations of the external magnetic field is passed through the loop in addition to the alternating current with a working frequency. Operation of the antenna in the transmission and reception regimes is considered. It is shown that a local increase in the magnetic field provides an increase in the antenna radiation impedance.

Technological Method of Substratum Metallization by Plasma-Arc Deposition

Institute of Applied Physics (IAP), Russian Academy of Sciences has developed a technological set-up for deposition of radio-reflecting coatings on various materials including composite materials like carbon-fibre and others is shown in Figure 1. The method of plasma deposition of coatings is based on electric arc vaporization of metals in vacuum chamber in active and inert gases added, as well as in their mixtures. The deposition of the vaporized substance on samples may be consequence for different materials. The coatings produced by this method have high degree of adhesion to the surface of processed materials, and high stability against thermal effects. Systems for motion of arcs that have been designed at IAP make it possible to obtain very homogeneous layers.