A kinetic trajectory simulation model for magnetized plasma sheath

Chalise, Roshan; Khanal, Raju

doi:10.1088/0741-3335/54/9/095006

Cited by 27 publications

(39 citation statements)

References 10 publications

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“…In this section we describe a numerical model of the 1D electrostatic rf sheath in a plasma-filled parallel-plate model, which generalizes our previous model 22 to include the effects of arbitrary ion magnetization, ion mobility and arbitrary magnetic field angle with respect to the 5 sheath. Viewed another way, this work generalizes work on steady state (dc) oblique angle sheaths and the magnetic presheath [32][33][34][35][36][37][38][39] to include rf sheath effects.…”

Section: Sheath Model Equationsmentioning

confidence: 91%

“…The other energy source in the present model is the dissipation of rf power in the sheath. This electrical power is supplied by the rf wave and is given by 1 JV A P  (35) where J and V 1 are the total rf current and voltage across the sheath, with the former given by Eq. (24).…”

Section: Sheath Power Dissipationmentioning

confidence: 99%

“…45 In this limit the ion current at frequency  is negligible in Eq. (35) and the displacement current is out of phase with V 1 . Only the electron current at the plate from Eq.…”

Section: Sheath Power Dissipationmentioning

confidence: 99%

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Radio frequency sheaths in an oblique magnetic field

Myra

D’Ippolito

2015

Physics of Plasmas

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The physics of radio-frequency (rf) sheaths near a conducting surface is studied for plasmas immersed in a magnetic field that makes an oblique angle with the surface. A set of one-dimensional equations is developed that describe the dynamics of the time-dependent magnetic presheath and non-neutral Debye sheath. The model employs Maxwell-Boltzmann electrons, and the magnetization and mobility of the ions is determined by the magnetic field strength, and wave frequency, respectively. The angle , assumed to be large enough to insure an electron-poor sheath, is otherwise arbitrary. Concentrating on the ion-cyclotron range of frequencies, the equations are solved numerically to obtain the rectified (dc) voltage, the rf voltage across the sheath and the rf current flowing through the sheath. As an application of this model, the sheath voltage-current relation is used to obtain the rf sheath impedance, which in turn gives an rf sheath boundary condition for the electric field at the sheath-plasma interface that can be used in rf wave codes. In general the impedance has both resistive and capacitive contributions, and generalizes previous sheath boundary condition models. The resistive part contributes to parasitic power dissipation at the wall.

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Section: Sheath Model Equationsmentioning

confidence: 91%

Section: Sheath Power Dissipationmentioning

confidence: 99%

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Radio frequency sheaths in an oblique magnetic field

Myra

D’Ippolito

2015

Physics of Plasmas

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“…Closing to the wall is the usual electrostatic sheath, also known as the Debye sheath and the magnetic presheath, known as the Chodura sheath near the plasma boundary. Various approaches have been proposed to explain the properties of plasma sheath and are still a subjected of interest [2][3][4][5][6][7][8][9][10][11].…”

mentioning

confidence: 99%

Effect of Ion Temperature Variation in Two-Ion Species Magnetized Plasma Sheath

Chaulagain¹,

Chalise²,

Khanal³

2017

JMSE-A

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For all practical applications of plasma, it has to be confined and in all such cases a sheath is formed at the material wall, which plays an important role in the properties of overall plasma wall transition region. The effect of ion temperature in a magnetized plasma sheath, which consists of two species of positive ions, has been studied using kinetic theory. The profile of ion densities, electron density, total charge density, potential is obtained by self-consistent solution to a non-neutral, collisionless, time independent plasma sheath. The physical parameters change slowly near the sheath entrance but exhibit steep gradient near the wall. The effect of applied magnetic field is more on ions whereas the electrons are almost non responsive and they are not influenced directly. In presence of magnetic field, the ion density is slightly lower compared to the case without magnetic field. The ion density increases on increasing ion temperature due to increase in their thermal velocity. On increasing the ion temperature, the total charge density at the wall increases and hence the potential decreases in magnitude. The result is useful in understanding and hence controlling the particles in plasma wall transition region especially in cases of two-ion species magnetized plasma sheath.

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“…The study of magnetized plasma sheath is one of the important research problems in plasma experiments, so the correlative works both of experiment and theory are developed greatly during the past several years [1][2][3][4], and significant number of work have been done in recent time [5][6][7][8] by using different models. Calculation of the ion flux from plasma to a surface of a cathode is one of the key problems of a theory of a plasma-surface interaction.…”

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confidence: 99%

The Study of Kinetic Energy of Ion and Sheath Thickness in Magnetized Plasma Sheath

Chalise¹,

Khanal²

2015

JMSE-A

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Abstract:In all plasma applications, sheath formed in front of a material wall is responsible for the flow of particles and energy towards the wall. The kinetic energy of ion and sheath thickness in magnetized plasma sheath region has been numerically investigated by using a kinetic trajectory simulation model for different magnetic field and its obliqueness. It has been revealed that, the kinetic energy of ions reaching the material wall can be controlled by the strength of applied magnetic field and its orientation. Kinetic energy of ion increases when we move towards the wall, whereas the kinetic energy of electrons decreases as expected, which becomes prominent as the strength and obliqueness of the field increase. It is found that by increasing the magnetic field strength, there is an increase in the ion energy and a decrease in the sheath thickness.

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A kinetic trajectory simulation model for magnetized plasma sheath

Cited by 27 publications

References 10 publications

Radio frequency sheaths in an oblique magnetic field

Radio frequency sheaths in an oblique magnetic field

Effect of Ion Temperature Variation in Two-Ion Species Magnetized Plasma Sheath

The Study of Kinetic Energy of Ion and Sheath Thickness in Magnetized Plasma Sheath

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