Cross-field diffusion in low-temperature plasma discharges of finite length

Curreli, Davide; Chen, Francis F.

doi:10.1088/0963-0252/23/6/064001

Cited by 31 publications

(33 citation statements)

References 59 publications

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“…3.20, we have considered the total flux balance where the parallel flux of electrons, obeying Boltzmann distribution comes in the picture. This could be a possible reason why the ambipolarity assumption and Boltzmann distribution across magnetic field lines has also yielded valid results [19,24,25].While the short-circuit effect can enhance the radial electron flux by allowing a net current flowing through the conducting end-plate. This is possible to achieve by having a spread of radial potential ∅(r) above the grounded end plate.…”

Section: Discussionmentioning

confidence: 81%

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Positive ion impediment across magnetic field in a partially magnetized plasma column

Das

Karkari

2019

Plasma Sources Sci. Technol.

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The radial characteristic of a partially magnetized plasma column created by a hot cathode filament is presented. It is found that in the absence of magnetic field, plasma potential and density varies similarly according to Boltzmann distribution. However when magnetic field increases, a clear divergence is seen as the plasma density becomes more pronounced in the centre whereas a corresponding minima is observed in plasma potential; which impede the radial diffusion of positive ions towards the grounded sidewalls. A phenomenological model based on short-circuiting effect is developed, which fairly explains this contrasting behaviour.

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Section: Discussionmentioning

confidence: 81%

“…The short-circuiting phenomena proposed by Simon have been recently recalled in a few publications [19,21,22,23]. In ref.…”

Section: Introductionmentioning

confidence: 91%

Positive ion impediment across magnetic field in a partially magnetized plasma column

Das

Karkari

2019

Plasma Sources Sci. Technol.

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“…A dimensionless parameter, which is called Havnes parameter [50,51] P h = Z d n d /n i decides the density of free electrons in a dusty plasma. [55] Since the radius of particles is 1¯m, the electron current flowing along B to dust particles will not be affected by B. In the case of high dust density, P h > 1, density of free electrons is very low or one can consider the electron depleted dusty plasma.…”

Section: Discussionmentioning

confidence: 99%

“…The magnetic field can also reduce the electron flux to the dust grain due to the cross-field diffusion. [55] Since the radius of particles is 1¯m, the electron current flowing along B to dust particles will not be affected by B. [56] However, it is expected to decrease the electron current perpendicular to B which reduces the electron loss to dust grains.…”

Section: Discussionmentioning

confidence: 99%

Influence of external magnetic field on dust acoustic waves in a capacitive RF discharge

Choudhary

Bergert²,

Mitic³

et al. 2019

Contributions to Plasma Physics

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This paper reports experiments on self-excited dust acoustic waves (DAWs) andits propagation characteristics in a magnetized rf discharge plasma. The DAWs are spontaneously excited in dusty plasma after adding more particles in the confining potential well and found to propagate in the direction of streaming ions. The spontaneous excitation of such low-frequency modes is possible due to the instabilities associated with streaming ions through the dust grain medium. The background E-field and neutral pressure determine the stability of excited DAWs. The characteristics of DAWs strongly depend on the strength of external magnetic field. The magnetic field of strength B < 0.05 T only modifies the characteristics of propagating waves in dusty plasma at moderate power and pressure, P = 3.5 W and p = 27 Pa, respectively. It is found that DAWs start to be damped with increasing the magnetic field beyond B > 0.05 T and get completely damped at higher magnetic field B ∼ 0.13 T. After lowering the power and pressure to 3 W and 23 Pa respectively, the excited DAWs in the absence of B are slightly unstable. In this case, the magnetic field only stabilizes and modifies the propagation characteristics of DAWs while the strength of B is increased up to 0.1 T or even higher. The modification of the sheath electric field where particles are confined in the presence of the external magnetic field is the main cause of the modification and damping of the DAWs in a magnetized rf discharge plasma. K E Y W O R D Sdust acoustic wave, magnetized dusty plasma, magnetized plasma, RF discharge, superconducting magnet 1The presence of submicron to micrometre-sized particles in a plasma makes it more complex because these particles alter the dynamics of the plasma species (electrons and ions) as well as they exhibit their own dynamics. Such medium, which consists of three charged species namely electrons, ions, and charged solid particles, is termed as a dusty plasma or complex plasma. In the background of a low-temperature plasma, energetic electrons impinge on the surface of the solid particle and charge their surface negatively up to 10 3 -10 5 times of an electron charge [1] to balance the fluxes of electrons and ions. After the density of negatively charged dust particles crosses a critical value, then long-range coulombic interaction among the dust particles turnsThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…The classical drift-diffusion theory of low density magnetized plasma transport [1][2][3] predicts that the plasma should reach a steady-state equilibrium qualitatively analogous to that of a non-magnetized discharge [4][5][6] and that the confinement increases with the magnetic field. However, when the value of the magnetic field is high enough, strong instabilities develop that deconfine the electrons, which enhance the macroscopic transport 7 . These so-called universal instabilities develop in bounded plasma, without any external source of energy.…”

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confidence: 99%

Instability-enhanced transport in low temperature magnetized plasma

et al. 2019

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It is shown that the transport in low temperature, collisional, bounded plasma is enhanced by instabilities at high magnetic field. While the magnetic field confines the electrons in a stable plasma, the instability completely destroys the confinement such that the transport becomes independent of the magnetic field in the highly magnetized limit. An analytical expression of the instability-enhanced collision frequency is proposed, based on a magnetic field independent edge-to-center density ratio.

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Cross-field diffusion in low-temperature plasma discharges of finite length

Cited by 31 publications

References 59 publications

Positive ion impediment across magnetic field in a partially magnetized plasma column

Positive ion impediment across magnetic field in a partially magnetized plasma column

Influence of external magnetic field on dust acoustic waves in a capacitive RF discharge

Instability-enhanced transport in low temperature magnetized plasma

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