Connecting the wakefield instabilities in dusty plasmas

Melzer, A.

doi:10.1103/physreve.90.053103

Cited by 28 publications

(16 citation statements)

References 30 publications

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“…The microparticles collect ions and electrons from the plasma and acquire high negative charges in our experiments, so that they interact via a screened Coulomb potential. They can be observed individually and thus enable observations on the kinetic level of diverse effects such as vortices, tunneling, crystallization fronts, various wave effects, and the onset of instabilities [10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…In ground experiments, gravity is one of the strongest forces acting on microparticles in a plasma, pulling them towards the lower plasma sheath, where they are suspended by the sheath's strong electric field. In this region, strong ion fluxes are present, which lead to effects such as wake formation [16,19]. Thus, it is desirable to perform experiments under microgravity conditions, when the microparticles are suspended in the more homogeneous plasma bulk with a weak electric field [20].…”

Section: Introductionmentioning

confidence: 99%

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Observation of metallic sphere–complex plasma interactions in microgravity

Schwabe¹,

Zhdanov²,

Hagl³

et al. 2017

New J. Phys.

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The PK-3 Plus laboratory on board the International Space Station is used to study the interaction between metallic spheres and a complex plasma. We show that the metallic spheres significantly affect both the local plasma environment and the microparticle dynamics. The spheres charge under the influence of the plasma and repel the microparticles, forming cavities surrounding the spheres. The size of the cavity around a sphere is used to study the force balance acting on microparticles at the cavity edge. We show that the ion drag force and pressure force from other microparticles balances with the electric force acting from the sphere to within 20%. At intermediate distances from the sphere surface, the interaction between the microparticles and the metallic spheres is attractive due to the drag force stemming from the ions which are moving towards the highly charged spheres. The spheres thus strongly affect the plasma fluxes. This modification of the plasma flux can lead to an effective surface tension acting on the microparticles, and to the excitation of dust-density waves near the spheres, as the local electric field crosses a threshold.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Observation of metallic sphere–complex plasma interactions in microgravity

Schwabe¹,

Zhdanov²,

Hagl³

et al. 2017

New J. Phys.

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“…As we mentioned earlier, the Schweigert instability is typically observed when an ion flow passes perpendicular to a layer of microspheres, and it is most profound if the microspheres in fact do not rest strictly in a single 2D plane, but instead have noticeably large out-of-plane displacements. 62,65,66,85 As the ions flow past a microparticle, they form a downstream wake, where there is a spatially localized concentration of positive space charge. That downstream wake can attract other microparticles, which are negatively charged.…”

Section: B Explaining How the Shock Can Decay Littlementioning

confidence: 99%

“…That downstream wake can attract other microparticles, which are negatively charged. This attraction to the ion wake can lead to a particularly strong energy transfer from the ion flow to the microparticles, 62,65,66,85 in what has been described as a nonreciprocal interaction. 2,63,64,66,78,85,86 Considerable kinetic energy can be added to microparticles, if they do not rest on a single plane, but instead have out-of-plane displacements.…”

Section: B Explaining How the Shock Can Decay Littlementioning

confidence: 99%

Shocks propagate in a 2D dusty plasma with less attenuation than that due to gas friction alone

Kananovich,

Goree

2020

Preprint

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In a dusty plasma, an impulsively generated shock, i.e., blast wave, was observed to decay less than would be expected due to gas friction alone. In the experiment, a single layer of microparticles was levitated in a radio-frequency glow-discharge plasma. In this layer, the microparticles were self-organized as a 2D solid-like strongly coupled plasma, which was perturbed by the piston-like mechanical movement of a wire. To excite a blast wave, the wire's motion was abruptly stopped, so that the input of mechanical energy ceased at a known time. It was seen that, as it propagated across the layer, the blast wave's amplitude persisted with little decay. This result extends similar findings, in previous experiments with 3D microparticle clouds, to the case of 2D clouds. In our cloud, out-of-plane displacements were observed, lending support to the possibility that an instability, driven by wakes in the ion flow, provides energy that sustains the blast wave's amplitude, despite the presence of gas damping.

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“…This leads to a compression of the particle cloud [ 10 ]. Since the same electric field that levitates the microparticles accelerates the ions out of the plasma, a fast ion flux results that disturbs the system [ 11 , 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Image Registration with Particles, Examplified with the Complex Plasma Laboratory PK-4 on Board the International Space Station

et al. 2019

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Often, in complex plasmas and beyond, images of particles are recorded with a side-by-side camera setup. These images ideally need to be joined to create a large combined image. This is, for instance, the case in the PK-4 Laboratory on board the International Space Station (the next generation of complex plasma laboratories in space). It enables observations of microparticles embedded in an elongated low temperature DC plasma tube. The microparticles acquire charges from the surrounding plasma and interact strongly with each other. A sheet of laser light illuminates the microparticles, and two cameras record the motion of the microparticles inside this laser sheet. The fields of view of these cameras slightly overlap. In this article, we present two methods to combine the associated image pairs into one image, namely the SimpleElastix toolkit based on comparing the mutual information and a method based on detecting the particle positions. We found that the method based on particle positions performs slightly better than that based on the mutual information, and conclude with recommendations for other researchers wanting to solve a related problem.

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Connecting the wakefield instabilities in dusty plasmas

Cited by 28 publications

References 30 publications

Observation of metallic sphere–complex plasma interactions in microgravity

Observation of metallic sphere–complex plasma interactions in microgravity

Shocks propagate in a 2D dusty plasma with less attenuation than that due to gas friction alone

Image Registration with Particles, Examplified with the Complex Plasma Laboratory PK-4 on Board the International Space Station

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