Sheath properties in active magnetized multi-component plasmas

Hatami, M. M.

doi:10.1038/s41598-021-88894-1

Cited by 10 publications

(9 citation statements)

References 39 publications

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“…In previous studies on the properties of the magnetized sheath, the stress tensor in the ion motion equations is often neglected, meaning that the influence of stress on ion motion is not considered [14][15][16][17]. Some studies only consider the effects of thermal pressure and external fields [18][19][20][21][22][23][24][25][26][27]. Generally, when ions enter the sheath, their velocity rapidly increases to several times the ion sound speed under the influence of the electric field.…”

Section: Introductionmentioning

confidence: 99%

Effect of ion stress on properties of magnetized plasma sheath

CHEN 陈,

CUI 崔,

GAO 高

et al. 2024

Plasma Sci. Technol.

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In the plasma sheath, there is a significant gradient in ion velocity, resulting in strong stress on ions treated as a fluid. This aspect has often been neglected in previous sheath studies. This study is based on the Braginskii plasma transport theory and establishes a 1D3V sheath fluid model that takes into account the ion stress effect. Under the assumption that ions undergo both electric and diamagnetic drift in the presheath region, self-consistent boundary conditions, including the ion Bohm velocity, are derived based on the property of the Sagdeev pseudopotential. Furthermore, assuming that the electron velocity at the wall follows a truncated Maxwellian distribution, the wall floating potential is calculated, leading to a more accurate sheath thickness estimation. The results show that ion stress significantly reduces the sheath thickness, enhances ion Bohm velocity, wall floating potential, and ion flux at the wall. It hinders the acceleration of ions within the sheath, leading to notable alterations in the particle density profiles within the sheath. Further research indicates that in ion stress, bulk viscous stress has the greatest impact on sheath properties.

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Section: Introductionmentioning

confidence: 99%

Effect of ion stress on properties of magnetized plasma sheath

CHEN 陈,

CUI 崔,

GAO 高

et al. 2024

Plasma Sci. Technol.

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“…To explore ion-acoustic rogue waves, the rational solution of the nonlinear Schrödinger (NLS) equation isobtained from the mKdV equation for small wavenumbers. Plasma composition parameters determine the properties of high-amplitude collision waves.Significantly, the utilization of negative ion plasma has garnered interest for the purpose of modifying the characteristics of the plasma sheath [9]. Sheath formation conditions, assuming Boltzmann distribution for electrons and negative ions and limited temperature for positive ions, are obtained from the Sagdeev potential.…”

Section: Introductionmentioning

confidence: 99%

“…It is found that the Bohm velocity of positive ions depends on plasma parameters, including ion-neutral collision frequency and positive and negative ion temperatures. Hatami [9] applied Bohm criteria to quantify electron, positive, and negative ion sheath features and compare them to quiescent plasma. Recently, the scientific and technological significance of negative ions in plasma has garnered considerable attention from several authors, e.g.…”

Section: Introductionmentioning

confidence: 99%

Envelope solitary waves in two-negative ions with stationary dust grains

Alharbi,

Alzahrani,

Moslem

et al. 2024

Phys. Scr.

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Using a multi-fluid model, we look at how modulated electrostatic dust-ion-acoustic wavepackets move nonlinearly through a plasma made up of a three-ion fluid with Maxwellianelectrons and stationary dust grains. A nonlinear Schr¨odinger (NLS) equation describesthe electric potential envelope wave packet. The analysis reveals the existence of differenttypes of localized modes, namely bright, dark, and grey solitons. We numerically analysethe coefficients of the NLS equation to identify stable or unstable regions for wave packetpropagation. It is found that higher relative density ratios increase the group velocity of thewave packets. Stable pulses can become unstable when plasma parameters exceed certainrelative density ratio values. Stable pulses can exist within a crucial window of the relativedust density ratio. Controlling the dust grain density ratio outside the zone can cause unstablewave packets or bright envelope solitons to propagate.

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“…Among the many physical characteristics of plasma discharges, the plasma sheath stands out as a critical component in most plasma experiments and industrial processes, and due to its complicated and variable structure, attempts to construct and simulate physical models of the plasma sheath have attracted widespread interest and research over the past decades [1][2][3][4][5][6][7][8][9][10]. Generally, when a plasma is adjacent to the container wall or material surface, a region of potential inhomogeneity is an inevitable result, since the ions have a substantially higher mass than the electrons and the electron mobility is at least two orders of magnitude greater than that of the ions, which results in the accumulation of negative charges on the wall and a negative potential in comparison to the bulk plasma.…”

Section: Introductionmentioning

confidence: 99%

Modeling of magnetized collisional plasma sheath with nonextensive electron distribution and ionization source

Chen¹,

Yang²,

An³

et al. 2023

Plasma Sci. Technol.

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The properties of atmospheric pressure collisional plasma sheath with non-extensively distributed electrons and hypothetical ionization source terms are studied in this work. The Bohm criterion for the magnetized plasma was extended in the presence of an ion-neutral collisional force and ionization source. The effects of electron non-extensive distribution, ionization frequency, ionneutral collision, magnetic field angle and ion temperature on the Bohm criterion of the plasma sheath are numerically analyzed. The fluid equations are solved numerically in the plasma-wall transition region using a modified Bohm criterion as the boundary condition. The plasma sheath properties such as charged particle density, floating sheath potential and thickness are thoroughly investigated under different kinds of ion source terms, the contributions of collisions, and magnetic fields. The results show that the effect of the ion source term on the properties of atmospheric pressure collisional plasma sheath is significant. As the ionization frequency increases, the Mach number of Bohm criterion decreases and the range of possible values narrows. When the ion source is considered, the space charge density increases, the sheath potential drops more rapidly, and the sheath thickness becomes narrower. In addition, ion-neutral collision, magnetic field angle and ion temperature also significantly affect the sheath potential profile and sheath thickness.

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Sheath properties in active magnetized multi-component plasmas

Cited by 10 publications

References 39 publications

Effect of ion stress on properties of magnetized plasma sheath

Effect of ion stress on properties of magnetized plasma sheath

Envelope solitary waves in two-negative ions with stationary dust grains

Modeling of magnetized collisional plasma sheath with nonextensive electron distribution and ionization source

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