Generation of sheath in magnetized plasma under the impact of slow rotation

Paul, J. W. M.; Nag, Apratim; Das, Himadri Sekhar

doi:10.1016/j.cjph.2018.04.007

Cited by 3 publications

(1 citation statement)

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“…When plasma interacts with walls or electrodes, a transition region that is not electrically neutral, called the plasma sheath, inevitably occurs. The study of sheaths is essential due to their increasing applications in various scenarios, such as plasmabased surface treatments [1,2], inductively coupled plasmas and electron cyclotron resonance plasmas [3] where magnetized sheaths could take place, probe diagnosis [4][5][6][7], boundary * Author to whom any correspondence should be addressed. plasma in fusion devices [8,9], etc.…”

Section: Introductionmentioning

confidence: 99%

Properties of collisional plasma sheath with ionization source term and two-temperature electrons in an oblique magnetic field

Chen,

An,

Tan

et al. 2024

J. Phys. D: Appl. Phys.

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A collisional magnetized plasma sheath with two groups of electrons has been studied using a fluid model including the effects of the ionization source term and the collisional force between ions and neutral atoms. Two kinds of non-Maxwellian descriptions of electron velocity distribution, non-extensive distribution and truncated distribution, are applied in the model, and the ionization effects of both kinds are considered. By applying Sagdeev potential, the modified Bohm sheath criterion is derived. The effects of ionization, magnetic field, and high-temperature electron concentration ratio on plasma sheath density, potential, sheath thickness, and ion kinetic energy are studied. In cases with high background gas density, ion density accumulates at the sheath edge position, forming a peak and manifesting as a rapid drop in the potential profile. The distribution characteristics of electrons have a significant impact on the transport properties of ions. Oscillations and non-monotonic characteristics of net charge near the sheath edge occur as the magnetic field angle increases, leading to an increase in the sheath layer width. It can be seen that in the case of a collisional sheath structure with high-temperature electrons, it is essential to consider the sheath changes induced by the ionization and the collisional force. Compared to a symmetric electron velocity distribution, the actual thickness of the sheath layer in a truncated electron distribution assumption could be significantly reduced.

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