1. Particle chains in a dilute dusty plasma with subsonic ion flow.
- Author
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Arp, O., Goree, J., and Piel, A.
- Subjects
- *
DUSTY plasmas , *ION flow dynamics , *PARTICLE dynamics , *RADIO frequency , *REDUCED gravity environments , *ION acoustic waves , *ELECTROSTATICS - Abstract
Chains of charged dust particles are observed aligned with a subsonic ion flow. These chains are found in dilute regions, near the midplane of a parallel-plate radio-frequency plasma under microgravity conditions. The argon ion flow speed near these chains was estimated to be of order 102 m/s, corresponding to an ion acoustic Mach number M < 0.1. The chains were observed to be stable in both the longitudinal and transverse directions. This stability suggests that there is a transverse restoring force. The transverse components of the ion-drag force or electrostatic wake-field forces could provide such a stabilizing effect. The chain appears to terminate with a final dust particle that is located in a dilute region; this observation suggests a possible attractive force in the longitudinal direction in the presence of a subsonic ion flow. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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