MF Microspheres: Helping or Puzzling Tool?

Vysinka, Marek; Nouzak, Libor; Pavlu, Jiri; Němeček, Zdenek; Šafránková, Jana; Richterová, I.

doi:10.1109/tps.2017.2764163

Cited by 4 publications

(4 citation statements)

References 28 publications

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“…Observations that particle size and shape are subject to modifications in a plasma environment were early reported by ex situ measurements [148][149][150]. With their phase-resolved resonance method Carstensen et al [25] found that the chargeto-mass ratio of MF-particles changes continuously and attributed this to an out-gassing of water and deposition processes in accordance with prior investigations of Pavlu et al of dust grains in quadrupole Paul traps [151].…”

Section: For An Example)supporting

confidence: 54%

Dusty (complex) plasmas—routes towards magnetized and polydisperse systems

Block

Melzer

2019

J. Phys. B: At. Mol. Opt. Phys.

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This tutorial covers recent developments in the field of dusty (complex) plasmas. After a brief summary of fundamental concepts, this tutorial will focus on novel diagnostics in dusty plasmas which have proven to be important tools on the route towards studying magnetized and polydisperse dust systems. These two hot topics of dusty (complex) plasma research are introduced, the current understanding is presented and open questions are identified. This tutorial is from an experimentalists’ perspective. Hence, the recent experimental progress in diagnostics, as well as in magnetized and polydisperse systems is described and discussed.

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Section: For An Example)supporting

confidence: 54%

Dusty (complex) plasmas—routes towards magnetized and polydisperse systems

Block

Melzer

2019

J. Phys. B: At. Mol. Opt. Phys.

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“…´-2 10 2 and 4×10 −3 at E 0 =10 and 14 keV, respectively [42,43]. The secondary emission current is…”

Section: Gas Ionization By the Ebmentioning

confidence: 97%

Pushing microscopic matter in plasma with an electron beam

Ticoş

Williams

2019

Plasma Phys. Control. Fusion

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Manipulation of microscopic structures is routinely carried out by exploiting the light pressure of a focused laser beam. Here we use a pulsed electron beam (EB) with energy 10-14 keV and peak current 4 mA instead of a photon flux and demonstrate transport of microscopic matter over a few centimeters. Hundreds of electrically charged microspheres m 11.8 m in diameter immersed in a radio-frequency plasma are driven into a flow with a speed of a few mm s −1 when irradiated by the EB. It is shown that the force associated with the electron momentum transfer is consistent with the observed acceleration of the microparticles (MPs) in gas at low pressure. Numerical estimates show that the electron drag force does not depend on the MP charge. The interaction of the EB is described in terms of the electron penetration depth, deposited energy and heating of the MPs, as well as the effect of the beam on the discharge. This proof of principles study has implications in dusty plasmas and beyond, in instances when MPs interact with sufficiently intense electron fluxes, and shows the potential to use an EB as a tool for displacing MPs.

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“…In addition, the data of experiments performed on ISS confirm previous observations from parabolic flights, [3] that microparticles in ground-based experiments move faster than under microgravity conditions. The difference is more pronounced for the lower pressure range (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30). The theoretical curves are in agreement with this tendency.…”

Section: Theoretical Modelmentioning

confidence: 99%

“…Another possible reason for the deviation between the theory and experimental measurements could be the changing of the microparticle mass and shape during the exposure in the plasma discharge as it has been reported in several works. [26][27][28][29][30] Since in our case the time of the microparticles levitation in the discharge corresponds to a minute timescale, we do not expect this effect to be very important.…”

Section: Theoretical Modelmentioning

confidence: 99%

Particle charge in PK-4 dc discharge from ground-based and microgravity experiments

et al. 2019

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The charge of microparticles immersed in the dc discharge of PK-4 experimental facility has been estimated using the particle velocities from experiments performed on Earth and under microgravity conditions on the International Space Station (ISS). The theoretical model used for these estimates is based on the balance of the forces acting on a single particle in the discharge. The model takes into account the radial dependence of the discharge parameters and describes reasonably well the experimental measurements. * Our very much admired and respected friend and colleague Vladimir Ivanovich Molotkov passed away unexpectedly on July 11, 2019, when this paper was finalized for submission.

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MF Microspheres: Helping or Puzzling Tool?

Cited by 4 publications

References 28 publications

Dusty (complex) plasmas—routes towards magnetized and polydisperse systems

Dusty (complex) plasmas—routes towards magnetized and polydisperse systems

Pushing microscopic matter in plasma with an electron beam

Particle charge in PK-4 dc discharge from ground-based and microgravity experiments

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