Browsing by Author "Petrov, O. F."

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    Dynamics of dust grains in an electron-dust plasma induced by solar radiation under microgravity conditions
    ([London] : IOP, 2003) Fortov, V. E.; Nefedov, A. P.; Vaulina, O. S.; Petrov, O. F.; Dranzhevski, I. E.; Lipaev, A. M.; Semenov, Yu. P.
    In this paper the results of experimental investigation of the dynamic behaviour of macroparticles charged via photoemission are presented. The experimental data have been obtained for bronze particles subjected to solar radiation under conditions of microgravity (on board the Mir space station). The distribution of velocity, temperatures and charge, as well as the friction coefficient and diffusion constants, have been found. The analysis of the results obtained has shown that the polarization effects of opposite charges may appreciably influence the transport processes in a two-component electron-dust plasma, consisting of positively charged dust and emitted electrons.
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    The dynamics of macroparticles in a direct current glow discharge plasma under micro-gravity conditions
    ([London] : IOP, 2003) Nefedov, A. P.; Vaulina, O. S.; Petrov, O. F.; Molotkov, V. I.; Torchinskii, V. M.; Fortov, V. E.; Chernyshev, A. V.; Lipaev, A. M.; Ivanov, A. I.; Kaleri, A. Yu.; Semenov, Yu. P.; Zaletin, S. V.
    The dynamics of large-sized (70-180 μm) spherical bronze particles in a direct current glow discharge plasma was studied experimentally under microgravitation conditions. The temperatures, velocities, pair correlation functions and self-diffusion coefficients of macroparticles were measured at various discharge currents. The charges of dust particles (on the order of 106 e) corresponded to high surface potentials of about 30-40 V.
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    Self-excited motions in dusty plasmas with gradient of charge of macroparticles
    ([London] : IOP, 2003) Vaulina, O. S.; Samarian, A. A.; Petrov, O. F.; James, B. W.; Fortov, V. E.
    Various self-excited motions in dusty plasmas involving spatial variations of macroparticle charge are considered. Two basic types of instabilities in these systems are examined numerically and analytically. The main attention is given to the vortex motions of macroparticles. Conditions suitable for creating the instabilities examined are discussed. Experimental observations of self-excited oscillations in dc-glow, and capacitive rf, discharges are presented. It is shown that spatial variation of dust charge can account for many phenomena observed in inhomogeneous laboratory dusty plasmas.