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Dust particle charging process in a radio frequency sheath of plasma containing kappa distribution electrons
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- Journal:
- Journal of Plasma Physics / Volume 88 / Issue 4 / August 2022
- Published online by Cambridge University Press:
- 25 July 2022, 905880403
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- Article
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Based on self-consistent modelling of the radio-frequency sheath parameters, such as the ion and electron densities and the ion velocity, the dust particle charging process in an RF sheath is investigated by employing the kappa $(\kappa )$
distribution for the electrons. It is shown that the charge number of the dust particle decreases near the sheath–wall interface while it shows the opposite tendency near the plasma-sheath edge, as the $\kappa$
value is decreased. The fluctuation of the dust particle charge modified by the $\kappa$
value depends on the dust particle radius. With an increases in the $\kappa$
value, the fluctuation of the dust particle charge has a slight increase for a small dust particle, and it shows a significant increase for a large dust particle. In addition, as the $\kappa$
value is decreased, the charge number of the dust particle obtained from the time-averaged plasma parameters deviates from the results obtained from the instantaneous plasma parameters. Moreover, a smaller deviation can be found for a large dust particle under the same $\kappa$
value conditions.
