Study of the process of dust grain discharging in the afterglow of an RF discharge

Филатова, И. И.; Trukhachev, F. M.; Chubrik, N. I.

doi:10.1134/s1063780x1111002x

Cited by 14 publications

(13 citation statements)

References 11 publications

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“…In the experiment, 11 the observed acceleration was $30 m=s 2 at neutral gas pressure of $1:5 Pa. We have confirmed this in our simulation where, at a pressure of $1:5 Pa, we obtain an acceleration of $20 m=s 2 which is quite close to the observed value. At higher gas pressures, our model simulations show much weaker acceleration which is in agreement with the recent experimental observations of the afterglow phase of a complex plasma in the regime of $100 Pa by Filatova et al 18 and Merlino. 19 In this pressure regime, the explosions are observed to be much weaker.…”

Section: Resultssupporting

confidence: 93%

“…In the high gas pressure regime, where the plasma density decays on a much longer time scale, we get a much weaker Yukawa explosion with reduced dust charge and much feebler acceleration. Recent experiments by Filatova et al 18 and Merlino 19 have indeed observed that in the high gas pressure regime ($100 Pa) the explosion of dust cluster is much weaker.…”

Section: Introductionmentioning

confidence: 96%

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Dust cluster explosion

2012

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A model for the dust cluster explosion where micron/sub-micron sized particles are accelerated at the expense of plasma thermal energy, in the afterglow phase of a complex plasma discharge is proposed. The model is tested by molecular dynamics simulations of dust particles in a confining potential. The nature of the explosion (caused by switching off the discharge) and the concomitant dust acceleration is found to depend critically on the pressure of the background neutral gas. At low gas pressure, the explosion is due to unshielded Coulomb repulsion between dust particles and yields maximum acceleration, while in the high pressure regime it is due to shielded Yukawa repulsion and yields much feebler acceleration. These results are in agreement with experimental findings. Our simulations also confirm a recently proposed electrostatic (ES) isothermal scaling relation, P E / V À2 d (where P E is the ES pressure of the dust particles and V d is the confining volume).

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Section: Resultssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 96%

Dust cluster explosion

2012

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“…At higher gas pressure in the range > 100 mTorr, the explosion was found to be much weaker than the explosion at lower pressure ≈ 10 m Torr [13]. This was confirmed in later experiments by other groups [5].…”

Section: Formation Of Dust Clustersupporting

confidence: 60%

“…As stated earlier an interesting correlation of the explosion with background gas pressure was observed. At higher gas pressure the explosion was observed to be much weaker [5,13]. Barkan and Merlino estimated the acceleration on the basis of a dust grain on the surface of the cluster interacting with near neighbors and found that it is insufficient to account for the observed acceleration of the ~ 3g [1].…”

Section: Explosion Of Dust Clustermentioning

confidence: 99%

“…The cluster diameter was 0.5 cm in size containing approximately 1000 particles which were confined in the electrostatic fields of the anode double layer. Since then similar dust clusters have been formed in a number of other interesting experiments e.g., dust particles confined in spherical clusters within the plasma in RF discharges [2][3][4] which are called dust coulomb balls or dust structures in other experiments [5], dust trapped deep inside the sheath region over appropriately designed cathode [6]. In these experiments, detailed investigations regarding structural properties of cluster, dust charging mechanisms and inter particle forces within the cluster etc.…”

Section: Introductionmentioning

confidence: 99%

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Dust clusters in complex plasmas

Khare¹

2014

AIP Conference Proceedings

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The effect of a direct current field on the microparticle charge in the plasma afterglow

Wörner¹,

Ivlev²,

Couëdel³

et al. 2013

Physics of Plasmas

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International audienceResidual charges of individual microparticles forming dense clouds were measured in a RF discharge afterglow. Experiments were performed under microgravity conditions on board the International Space Station, which ensured particle levitation inside the gas volume after the plasma switch-off. The distribution of residual charges as well as the spatial distribution of charged particles across the cloud were analyzed by applying a low-frequency voltage to the electrodes and measuring amplitudes of the resulting particle oscillations. Upon "free decharging" conditions, the charge distribution had a sharp peak at zero and was rather symmetric (with charges concentrated between -10e and +10e), yet positively and negatively charged particles were homogeneously distributed over the cloud. However, when decharging evolved in the presence of an external DC field (applied shortly before the plasma switch-off) practically all residual charges were positive. In this case, the overall charge distribution had a sharp peak at about þ15e and was highly asymmetric, while the spatial distribution exhibited a significant charge gradient along the direction of the applied DC field

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Study of the process of dust grain discharging in the afterglow of an RF discharge

Cited by 14 publications

References 11 publications

Dust cluster explosion

Dust cluster explosion

Dust clusters in complex plasmas

The effect of a direct current field on the microparticle charge in the plasma afterglow

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