The Bohm criterion for a collisional plasma sheath in an oblique magnetic field

Xiu, Zou; Yan-Kun, Ji; Bin-Yan, Zou

doi:10.7498/aps.59.1902

Cited by 11 publications

(3 citation statements)

References 20 publications

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“…For a collisionless electrostatic plasma sheath without an applied magnetic field (𝛾 𝑖 = 0, 𝜈 = 0, 𝛿 𝑠 = 1), inequality (14) becomes 𝑀 2 𝑖 ≥ 1, which is the wellknown Bohm criterion. [1][2][3][4][5][6]24] It means that the ion flow velocity entering the sheath must be equal to or greater than the ion acoustic speed. For a collisionless electronegative plasma sheath without an applied magnetic field (𝛾 𝑖 = 0, 𝜈 = 0, 𝛿 𝑠 ̸ = 1), inequality ( 14) becomes 𝑀 2 𝑖 ≥ 1/𝛿 𝑠 .…”

Section: Plasmamentioning

confidence: 99%

“…In 2010, we investigated the Bohm criterion in a magnetized plasma sheath taking account of collision, and presented the effects of an external magnetic field on the Bohm criterion. [24] In this Letter, based on the theoretical analysis, the sheath criterion for a collisional electronegative plasma sheath in the presence of an applied magnetic field is obtained. Also, the effect of the applied magnetic field on the ion Mach number is discussed.…”

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confidence: 99%

“…We consider a plasma sheath, which has onedimensional coordinate space and three-dimensional speed coordinates. [24] An applied magnetic field, which is spatially uniform and constant in time, is embedded in the (𝑥, 𝑧) plane and makes an angle 𝜃 with respect to the 𝑥 axis (Fig. 1).…”

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confidence: 99%

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Sheath Criterion for a Collisional Electronegative Plasma Sheath in an Applied Magnetic Field

Xiu¹,

Liu²,

Qiu³

et al. 2011

Chinese Phys. Lett.

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The sheath criterion for a collisional electronegative plasma sheath in an applied magnetic field is investigated. It is assumed that the system consists of hot electrons, hot negative ions and cold positive ions. The effect of an applied magnetic field on the sheath criterion is discussed. The results reveal that the magnetic field has effects on both the upper and lower limits, which cause the range of the ion Mach number to increase. In addition, the numerical calculations of the electronegative plasma sheath are carried out to demonstrate the effects of sheath criterion on the characteristics of the sheath.

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Section: Plasmamentioning

confidence: 99%

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confidence: 99%

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Sheath Criterion for a Collisional Electronegative Plasma Sheath in an Applied Magnetic Field

Xiu¹,

Liu²,

Qiu³

et al. 2011

Chinese Phys. Lett.

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Properties of a warm plasma collisional sheath in an oblique magnetic field

Yang

2012

Physics of Plasmas

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The properties of a warm plasma collisional sheath in an oblique magnetic field and the associated sheath criterion are investigated with a two-fluid model. In the fluid framework, a sheath criterion including effects of the magnetic field and collision is established theoretically for a wide range of ion temperature. With the sheath criterion as the plasma-sheath boundary condition, different plasma parameters including potential, electron and ion densities, and ion velocity are calculated for various ion temperatures and ion thermal motions. It is shown that the properties of the sheath depend not only on the plasma balance equations but also on the sheath boundary conditions. In addition, effects of the directions and magnitudes of the magnetic field on the plasma sheath are also discussed under different ion temperatures.

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Near-wall conductivity effect under a space—charge-saturated sheath in the Hall thruster

张凤奎¹,

丁永杰²,

卿绍伟³

et al. 2011

Chinese Phys. B

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This paper adopts modified Morozov secondary electron emission model to make research into the impact of the character of space-charge-saturated sheath near the insulated wall of Hall thruster on the near-wall conductivity, by the method of 2D particle simulation (2D+3V). The results show that, due to the sharp increase of collision frequency between the electrons and the wall under the space-charge-saturated sheath, the near wall transport current under this sheath is remarkably higher than that under classical sheath, and equal to the near wall transport current under spatial oscillated sheath in the order of magnitude. However, the transport currents under space-charge-saturated sheath and spatial oscillated sheath are different in the mechanism, causing different current density distribution under the above two sheaths, and a great impact of channel width on the near wall transport current under space-charge-saturated sheath. Hall thruster is a kind of plasma equipment discharging in the configuration of crossed electric and magnetic

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The Bohm criterion for a collisional plasma sheath in an oblique magnetic field

Cited by 11 publications

References 20 publications

Sheath Criterion for a Collisional Electronegative Plasma Sheath in an Applied Magnetic Field

Sheath Criterion for a Collisional Electronegative Plasma Sheath in an Applied Magnetic Field

Properties of a warm plasma collisional sheath in an oblique magnetic field

Near-wall conductivity effect under a space—charge-saturated sheath in the Hall thruster

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