Ion collection by a sphere in a flowing plasma: 3. Floating potential and drag force
TLDR
In this paper, the interaction of an ion-collecting sphere at floating potential with a flowing collisionless plasma is investigated using the particle in cell code SCEPTIC, and the dependence of the floating potential on the flow velocity for a conducting sphere is found to agree very well with the orbital motion limited approximation, which ignores the asymmetry in the plasma potential.Abstract:
The interaction of an ion-collecting sphere at floating potential with a flowing collisionless plasma is investigated using the particle in cell code SCEPTIC. The dependence of the floating potential on the flow velocity for a conducting sphere is found to agree very well with the orbital motion limited approximation, which ignores the asymmetry in the plasma potential. But the charge, even on conducting spheres and at zero flow, is not well represented by using the standard expression for capacitance. Insulating spheres become asymmetrically charged because of ion collection asymmetry, and their total (negative) charge is considerably increased by flow. The collection flux asymmetry is documented for both conducting and insulating spheres and is not greatly different between them. The drag force upon the sphere is obtained from the code calculations. It shows reasonable agreement with appropriate analytic approximations. However, numerical discrepancies up to 20% are found, which are attributed to uncertainties in the analytical values.read more
Citations
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References
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Book
Introduction to Dusty Plasma Physics
TL;DR: The book Introduction to Plasma Physics by Shukla and Mamun as discussed by the authors deals with various aspects of collective processes in dusty plasmas and provides a handbook on waves and instabilities in the coming years.
Book
Principles of Plasma Diagnostics
TL;DR: In this paper, the authors introduce a glossary of fast ions and fusion products, including fast ions, fast ion, and fast ion fusion products and their applications in the field of magnetic diagnostics.
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The Theory of Collectors in Gaseous Discharges
H. M. Mott-Smith,Irving Langmuir +1 more
TL;DR: In this article, a cylindrical or spherical electrode (collector) immersed in an ionized gas is brought to a suitable potential, it becomes surrounded by a symmetrical space charge region or "sheath" of positive or of negative ions (or electrons).
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Dynamical friction. I. General considerations: the coefficient of dynamical friction
TL;DR: In this paper, it was shown that a star must experience dynamical friction, i.e., it must suffer from a systematic tendency to be decelerated in the direction of its motion.