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17Complex Systems of Charged Particles and their Interactions with Electromagnetic Radiation 2018
THE EVOLUTION OF DISSIPATIVE DUST STRUCTURES IN PLASMA UNDER ACTION OF LOW ENTROPY RADIATION
Oleg F. Petrov12
Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, Russia 23Moscow Institute of Physics and Technology, Dolgoprudny, Russia *e-mail: ofpetrov@ihed.ras.ru
The dust particles in plasma represent a non-neutral or quasi-neutral systems (dusty
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plasmas) containing micron-sized charged particles of substance with electrical charges up to 10 -105e. Most of the laboratory studies of dusty plasmas are carried out in weakly ionized gas discharge plasmas. As a result of strong interaction of the strongly charged dust particles they may form the open dissipative ordered structures of liquid and crystal types that are different from gaslike or chaotic systems. The laboratory dusty plasma is the unique object for studying the structure, phase transitions and transport properties of the systems of interacting grains on the "kinetic level".
We study Brownian motion of metal coated grains, suspended in rf gas discharge, under laser irradiation that could be considered as low entropy radiation. The motion is caused by photophoresis: i.e., absorption of a laser at the metal-coated surface of the particle creates radiometric force which in turn drives the particle. The grains gain
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sufficiently high electrical charge (~10 -10 of electron charge) under the flows of plasma particles. The action of external forces and forces of interparticle interaction combined with dissipative mechanisms in these systems can lead to the self-organization (evolution) of the system, resulting in formation of quasi-stationary crystal- or liquid-like structures. We observed experimentally the active Brownian motion caused by radiometric force at different Coulomb coupling of the charged grains. As a result, we present our studies the evolution of dissipative dust structures strongly coupled systems of charged dust particles driven by low entropy laser radiation.
