Abstract
In this chapter we will discuss the main forces acting on dust particles in a plasma discharge. These forces are gravity, electric field force, ion drag force, thermophoresis and neutral drag. After the analysis of the forces under plasma conditions the trapping of large (micron-sized) dust particles in the laboratory and under microgravity as well as of small (submicron) particles in plasma processing devices will be described. We are then in a position to discuss vertical oscillations in the plasma sheath and to derive a first set of methods for the charge measurement in the sheath of a plasma.
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Notes
- 1.
As an estimate: Taking ∇E ∼ E∕λ D with the Debye length λ D and E ∼ k B T e∕(eλ D) yields F dip ∼ F E(a∕λ D)2 ≪ F E for the typical situation a ≪ λ D.
- 2.
In this case, the dipole moment is of the order of p ∼ (4πε 0 a)(k B T e∕e) a [3], hence, F dip ∼ F E(a∕λ D).
- 3.
The different prefactor given here compared that in Ref. [9] is due to the different normalizations of the thermal velocity.
- 4.
When defining the thermal velocity as \(\tilde {v}_{\mathrm {th,n}} = \sqrt { k_{\mathrm {B}} T_{\mathrm {n}}/m_{\mathrm {n}}}\), then \(\beta = \delta \sqrt {8/\pi }\, p /(a \rho _{\mathrm {d}} \tilde {v}_{\mathrm {th,n}})\).
- 5.
When defining the thermal velocity as \(\tilde {v}_{\mathrm {th,n}} \,{=}\, \sqrt {k_{\mathrm {B}} T_{\mathrm {n}}/m_{\mathrm {n}}}\), then \(F_{\mathrm {th}} \,{=}\, -(16/15)\sqrt {\pi /2} a^2 k_{\mathrm {n}}/\tilde {v}_{\mathrm {th,n}} \nabla T_{\mathrm {n}}\).
- 6.
For a 3 cm electrode gap this corresponds to a temperature difference of 6∘C, only.
- 7.
Here, for convenience, we have dropped the index “d” for the dust charge and use Q(z) = |Q d(z)| as positive.
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Melzer, A. (2019). Forces and Trapping of Dust Particles. In: Physics of Dusty Plasmas. Lecture Notes in Physics, vol 962. Springer, Cham. https://doi.org/10.1007/978-3-030-20260-6_3
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