Laser Manipulation of the Void Edge in Dusty Plasmas Under Microgravity

Wolter, Matthias; Melzer, A.; Arp, O.; Klindworth, M.; Kroll, M.; Piel, A.

doi:10.1109/tps.2007.893257

Cited by 9 publications

(4 citation statements)

References 12 publications

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“…21 The force balance at the void edge was recently quantified experimentally. 22 For slightly different plasma parameters and using a large amount of dust, we have found a toroidal shape of the dust cloud with a central hole. This is an immediate hint at the formation of a central void region.…”

Section: A Confinementmentioning

confidence: 77%

Dynamics of small dust clouds trapped in a magnetized anodic plasma

et al. 2007

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Small dust clouds, which are confined in an anodic plasma, are studied with respect to their structure and their response to modulation of the anode bias. The dust cloud is displaced from the center of the discharge by a process similar to the void mechanism in radio-frequency discharges under microgravity. The top layers of the dust cloud are in a crystalline state and the cloud performs a slow rotation about the magnetic field direction. For modulation frequencies below 15Hz, a sloshing and stretching motion in the confining potential well is found. Spontaneously excited dust density waves are observed when the dust cloud exceeds a minimum size. The waves are characterized by sickle-shaped wave fronts. No standing waves were found. The wave dispersion shows an influence of the boundedness of the system in terms of a frequency cutoff.

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Section: A Confinementmentioning

confidence: 77%

Dynamics of small dust clouds trapped in a magnetized anodic plasma

et al. 2007

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“…Voids have been recognized in both laboratory plasmas [1,2] and complex plasmas under microgravity conditions [3][4][5]. In addition to experiments, the formation of voids has been extensively studied theoretically and by means of computer simulations [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Absolute measurement of the total ion-drag force on a single plasma-confined microparticle at the void edge under microgravity conditions

2013

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We present an absolute measurement of the total ion-drag force on one single microparticle at the edge of the dust free region in low pressure complex plasmas: the void. In order to do so, the particle confinement position was monitored as a function of the gas pressure for two particle sizes under normal gravity conditions and under microgravity conditions during parabolic flights. At the border of the void, the ion-drag force on a particle with a radius of 4.90 μm appeared to be (3.6 ± 0.3) × 10 −12 N.

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“…[2] Various models were suggested to describe dust charging in plasma bulk and sheath, [3][4][5][6] forces acting on the individual dust particle [7][8][9][10][11] , and collective behavior of dust clouds. [9,12,13] In our present study, we will limit on particles in radio frequency (rf) plasma sheath. The investigations include both the modeling of dust-plasma interactions and of rf plasma sheath.…”

Section: Introductionmentioning

confidence: 99%

“…The permanent interest arises from various applications in astronomy1 and technology 2. Various models were suggested to describe dust charging in plasma bulk and sheath,3–6 forces acting on the individual dust particle7–11, and collective behavior of dust clouds 9, 12, 13…”

Section: Introductionmentioning

confidence: 99%

Micro‐Particles as Electrostatic Probes for Plasma Sheath Diagnostics

Wolter¹,

Haass²,

Ockenga³

et al. 2009

Plasma Processes & Polymers

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In basic plasma physics and plasma technology, micro‐particles (dust grains) play an important role for the investigation and understanding of the behavior of different plasma species. It is well known that micrometer‐sized particles can find an equilibrium position if all acting forces to the particles are balanced. This stable point is a few millimeters above the powered electrode in the plasma sheath. In our experimental set‐up, we observed the position and the motion of microscopic test particles with a typical radius between 4.78 and 13.3 µm. In addition to the experiments, we also investigate the particle behavior by a numerical model. By comparison between the numerical model and the experimental observation, internal plasma parameters can be obtained.

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Laser Manipulation of the Void Edge in Dusty Plasmas Under Microgravity

Cited by 9 publications

References 12 publications

Dynamics of small dust clouds trapped in a magnetized anodic plasma

Dynamics of small dust clouds trapped in a magnetized anodic plasma

Absolute measurement of the total ion-drag force on a single plasma-confined microparticle at the void edge under microgravity conditions

Micro‐Particles as Electrostatic Probes for Plasma Sheath Diagnostics

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