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Study of Cryogenic Complex Plasma

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Final rept. 7 Jul 2008-7 Jun 2010

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The charge state of dust particles in a plasma in a liquid helium vapor has been determined by the trajectory of dust particles under the application of electric field. The charging and decharging processes in cryogenic collision plasma have been studied. Two dimensional lattice waves have been identified for dust particles floating at the sheath edge and the bow wave formation has been observed in YCOPEX. Major results include 1. Measurement of charge state of dust particles by the method of oscillating motion of dust particles. The determining method is unique in a sense that particles dropped vertically in YD-1 about 1m in length and bounced up and down in the sheath without touching the bottom of the tube. 2. Measurement of charge state of dust particles in YD-2. Charge of dust particles in a cryogenic environment is found to be much smaller than those at room temperature. The smaller charge is explained by the collisionality of neutral particles in a liquid helium vapor plasma. 3. A large area complex plasma device YCOPEX is used to study basic parameters associated with dusty plasma like screening length. Dust-plasma interaction was studied in a two dimensional dust sheet.

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics
  • Thermodynamics

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