Dusty radio frequency discharges in argon

Chutov, Yu. I.; Goedheer, W. J.

doi:10.1109/tps.2003.815490

Cited by 13 publications

(10 citation statements)

References 46 publications

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“…The CCD camera used in the present sets of the experiment is able to record 20 fps at the resolution of 1024 × 768 pixels. [38] The computer simulation by Chutov and Goedheer [39] suggests an rf sheath expansion in the presence of a large number of particles. [36] It should be noted that the excitation of waves in the dusty plasma is only possible when the dust cloud width exceeds the wavelength of dust acoustic wave at small dust-neutral friction or low gas pressure.…”

Section: Dust Acoustic Waves and Its Characteristics In Absence Of Mamentioning

confidence: 99%

“…At ground-based experiments, a large volume dusty plasma is possible either in specific discharge configuration [17,37] or discharges with nano to sub-micron sized particles. [38] The computer simulation by Chutov and Goedheer [39] suggests an rf sheath expansion in the presence of a large number of particles. To keep this idea in mind, we have used particles with size r = 1.025¯m to create a volumetric dusty plasma at low pressure.…”

Section: Dust Acoustic Waves and Its Characteristics In Absence Of Mamentioning

confidence: 99%

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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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Section: Dust Acoustic Waves and Its Characteristics In Absence Of Mamentioning

confidence: 99%

Section: Dust Acoustic Waves and Its Characteristics In Absence Of Mamentioning

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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“…Some authors have also performed a molecular dynamics simulation of the plasma flow around stationary microparticles [35][36][37]. PIC methods can also be used to study the whole discharge with stationary dust [38,39]. If the PIC is coupled to microparticle transport modules [40][41][42], dust distribution functions can be derived.…”

Section: Introductionmentioning

confidence: 99%

Simulating the dynamics of complex plasmas

Schwabe

Graves

2013

Phys. Rev. E

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Complex plasmas are low temperature plasmas that contain micrometer-sized particles in addition to the neutral gas particles and the ions and electrons that make up the plasma. The microparticles interact strongly and display a wealth of collective effects. Here, we report on linked numerical simulations that reproduce many of the experimental results of complex plasmas. We model a capacitively coupled plasma with a fluid code written for the commercial package COMSOL. The output of this model is used to calculate forces on microparticles. The microparticles are modeled using the molecular dynamics package LAMMPS, which we extended to include the forces from the plasma. Using this method, we are able to reproduce void formation, the separation of particles of different sizes into layers, lane formation, vortex formation and other effects.

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“…The shifted Maxwellian distribution is the commonly used assumption for the IEDF in a non-zero external electrical field. Particle in cell Monte Carlo collision (PIC-MCC) simulations of charging of unmovable dust were performed in [4]. However, the shapes of the EEDF and IEDF, as well as the procedure of equilibration of the electron and ion currents on the dust particle surface were not discussed.…”

Section: Introductionmentioning

confidence: 99%

“…However, the shapes of the EEDF and IEDF, as well as the procedure of equilibration of the electron and ion currents on the dust particle surface were not discussed. In [4] the unmovable dust was taken to be uniformly distributed over the discharge gap including the electrode sheaths and this assumption makes the results less reliable, because the heavy negatively charged dust is not able to penetrate in the electrode sheath area. Recently the formation of the steady state nanosize dust profile in the rf discharge and the influence of dust size on the plasma parameters were studied in argon in [5] and in a mixture of argon and acetylene in [6].…”

Section: Introductionmentioning

confidence: 99%

A non-Maxwellian kinetic approach for charging of dust particles in discharge plasmas

2008

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Effect of large-angle scattering, ion flow speed and ion-neutral collisions on dust transport under microgravity conditions V Land and W J Goedheer Abstract. Nanoparticle charging in a capacitively coupled radio frequency discharge in argon is studied using a particle in cell Monte Carlo collisions method. The plasma parameters and dust potential were calculated selfconsistently for different unmovable dust profiles. A new method for definition of the dust floating potential is proposed, based on the information about electron and ion energy distribution functions, obtained during the kinetic simulations. This approach provides an accurate balance of the electron and ion currents on the dust particle surface and allows us to precisely calculate the dust floating potential. A comparison of the obtained floating potentials with the results of the traditional orbital motion limit (OML) theory shows that in the presence of the ion resonant charge exchange collisions, even when the OML approximation is valid, its results are correct only in the region of a weak electric field, where the ion drift velocity is much smaller than the thermal one. With increasing ion drift velocity, the absolute value of the calculated dust potential becomes significantly smaller than the theory predicts. This is explained by a non-Maxwellian shape of the ion energy distribution function for the case of fast ion drift.

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Dusty radio frequency discharges in argon

Cited by 13 publications

References 46 publications

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

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

Simulating the dynamics of complex plasmas

A non-Maxwellian kinetic approach for charging of dust particles in discharge plasmas

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