COULOMB SYSTEMS OF STRONGLY INTERACTING DUST PARTICLES: LABORATORY AND MICROGRAVITY CONDITIONS
O. F. Petrov1,2, O. S. Vaulina1, M. M. Vasiliev1, E. A. Lisin1, M. I. Myasnikov1, S. N. Antipov1, V. M. Chepelev1,2, X. G. Koss1, Y. Tun2, V. E. Fortov1,2
1Joint Institute for High Temperatures, Russian Academy of Sciences, ul. Izhorskaya 13, building 2, Moscow, 125412 Russia
2Moscow Institute of Physics and Technology, per. Institutskii 9, Dolgoprudnyi, Moscow Region, 141700 Russia
Keywords: dusty plasma structures, dusty plasma, microgravity, cryogenic discharge, electron beam, Brownian motion
Abstract
Formation of ordered structures from a large number (~104) of charged diamagnetic macroparticles in a cusp magnetic trap under microgravity conditions is experimentally studied. The experiments are performed onboard the International Space Station. Dusty plasma structures in a cryogenic d.c. glow discharge (cryogenic dusty plasma) are examined. Ultrahigh charging of dust macroparticles under the action of an electron beam is experimentally obtained and studied. Results of an experimental investigation of various regimes of the Brownian motion of interacting dust particles in the plasma are presented. A method of determining particle interaction forces in nonideal systems with isotropic pair potentials is proposed. The method is based on solving an inverse problem that describes the motion of interacting particles by a system of the Langevin equations and allows reconstruction of parameters of the external confining potential without using a priori information about the friction coefficients of particles.
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