Rotation of Coulomb Clusters in Magnetised Dusty Plasma

Cheung, F. M. H.; Samarian, A. A.; James, B. W.

doi:10.1238/physica.topical.098a00143

Cited by 5 publications

(5 citation statements)

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“…However, Cheung et al found that attributing the dust cluster rotation only to the action of the ion drag force cannot explain the observed value of the angular velocity of the rotating dust clusters. [22,24] According to our experimental results, the dust cluster rotation can be attributed to the strong radial confinement electric force. In our experiments, the dust rotation may start under the action of local instabilities, [12,14,25] such as the thermal instability, in the strong radial confinement, therefore the rotation directions of the dust clusters may be different, such as the anticlockwise direction shown in Figs.…”

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confidence: 52%

Cluster Rotation in an Unmagnetized Dusty Plasma

Huang¹,

Liu²,

Chen³

et al. 2013

Chinese Phys. Lett.

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Rotation of dust clusters in an unmagnetized dusty plasma under different gas pressures is experimentally studied. Clusters containing different numbers of charged dust grains are found in different horizontal planes. The mechanism behind the dust rotation is investigated by using molecular dynamics simulations. The experimental and simulation results show that the radial confinement potential plays an important role in determining the properties of the cluster rotation under given gas pressure or temperature.

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confidence: 52%

Cluster Rotation in an Unmagnetized Dusty Plasma

Huang¹,

Liu²,

Chen³

et al. 2013

Chinese Phys. Lett.

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“…This is evident by the decrease in size in the dust cluster as we increase the magnetic field (see Ref. [3]). But since E r $ B n ; so F ID $ E r B $ B nþ1 $ B for small n $ 0:5-1.…”

mentioning

confidence: 78%

“…The experiment is conducted in a radio-frequency (rf) discharge with a printed-circuit board (PCB) electrode system. The detailed configuration of the apparatus was described in earlier papers [3][4][5]. Figure 1 shows the interior of the experimental apparatus.…”

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confidence: 99%

Angular Velocity Saturation in Planar Dust Cluster Rotation

2004

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Dust clusters, consisted of one up to twelve particles arranged in a horizontal plane, were formed in an inductively coupled rf plasma. When an axial magnetic field was applied to the dust clusters, the clusters rotate collectively in the left-handed direction with respect to the field. It was observed in our cluster rotation that, for single ring cluster, the angular velocity of the rotation increased linearly as the magnetic field strength increased. And for double ring dust clusters, the angular velocity increases linearly at low magnetic field and but then saturated at high magnetic field ð$ 60GÞ: Comparison of our experimental results with theoretical models from literature has been made and an explanation for the angular velocity saturation of the dust cluster rotation has been provided.

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“…Instead, they fill the plasma volume leaving, the sheath as a dust void. The shape of the potential well above the confining electrode in a radio-frequency (rf) discharge with a printed-circuit board electrode system [5] was visualised using fine dust grains that were generated in the discharge. The well shape was found to depend strongly on the confining potential.…”

Section: Figure 1 Position Of Sheath Edge H B As a Functionmentioning

confidence: 99%

Dust grains as a diagnostic tool for rf-discharge plasma

James¹

2002

AIP Conference Proceedings

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Dust particles can be a useful plasma diagnostic tool. Sufficiently dust particles can be used as test grains for the visualization of the plasma potential distribution; larger dust particles can be used as specific probes to determine electron temperature. Here we report on diagnostic measurements carried out in a capacitively coupled planar rf discharge. The location of the sheath edge has been determined using test dust grains. Our diagnostic technique is based on measuring the equilibrium position of fine grains levitated above the powered electrode in an rf-discharge. Estimates show that for grains with radii less than 500 mm the grain equilibrium position and sheath edge location differ by less than 5 percent, and this difference continues to decrease with decreasing investigate grain radius. We use this technique to diagnose the sheath in an argon plasma which was generated at pressures in the range 20-100 mTorr by applying a 15 MHz signal to the power electrode. The shape of the potential well above the confining electrode was also visualized using even smaller dust grains that were generated in the discharge. The well shape was found to depend strongly on the confining potential.

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Rotation of Coulomb Clusters in Magnetised Dusty Plasma

Cited by 5 publications

References 1 publication

Cluster Rotation in an Unmagnetized Dusty Plasma

Cluster Rotation in an Unmagnetized Dusty Plasma

Angular Velocity Saturation in Planar Dust Cluster Rotation

Dust grains as a diagnostic tool for rf-discharge plasma

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