Superhigh dust charging by high-voltage electron beam

Фортов, В. Е.; Gavrikov, A. V.; Петров, О. Ф.; Sidorov, V. S.; Vasiliev, Mikhail; Vorona, N. A.

doi:10.1209/0295-5075/94/55001

Cited by 9 publications

(5 citation statements)

References 26 publications

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“…For comparison the circles show the shift for a free electron gas. The effect is strongest for the first resonance, where a surface electron density 10 13 cm −2 (or an equivalent bulk charge), realized for instance in dusty plasmas [28], yields a shift of a few wavenumbers.…”

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confidence: 99%

Mie Scattering by a Charged Dielectric Particle

2012

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We study for a dielectric particle the effect of surplus electrons on the anomalous scattering of light arising from the transverse optical phonon resonance in the particle's dielectric function. Excess electrons affect the polarizability of the particle by their phonon-limited conductivity, either in a surface layer (negative electron affinity) or the conduction band (positive electron affinity). We show that surplus electrons shift an extinction resonance in the infrared. This offers an optical way to measure the charge of the particle and to use it in a plasma as a minimally invasive electric probe.

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confidence: 99%

Mie Scattering by a Charged Dielectric Particle

2012

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“…It is the position of the shell resonance we propose to use as a charge diagnostics because of its charge sensitivity and its high wave number. The former opens the door to measure particle charges in ordinary [9] and not only in highly specialized [33,34] dusty laboratory plasmas while the latter lessens the requirements on the infrared instrumentation [32]. The shell resonance does however not always appear.…”

Section: Resultsmentioning

confidence: 99%

“…A micron-sized particle, for instance, would have to charge up to Z p ≈ 6 × 10 5 to induce a shift of one wave number. In reality, however, leaving specialized plasmas containing high-energy electrons aside [33,34], a micron-sized particle carries most probably much less charge [16]. It looks like as if the proposed optical charge diagnostics is only feasible for rather small particles.…”

Section: Introductionmentioning

confidence: 99%

Infrared light extinction by charged dielectric core-coat particles

et al. 2014

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We study the effect of surplus electrons on the infrared extinction of dielectric particles with a core-coat structure and propose to use it for an optical measurement of the particle charge in a dusty plasma. The particles consist of an inner core with negative and an outer coat with positive electron affinity. Both the core and the coat give rise to strong transverse optical phonon resonances, leading to anomalous light scattering in the infrared. Due to the radial profile of the electron affinity electrons accumulate in the coat region making the infrared extinction of this type of particles very charge-sensitive, in particular, the extinction due to a resonance arising solely due to the core-coat structure. The maximum of this resonance is in the far-infrared and responds to particle charges realizable in ordinary dusty laboratory plasmas. PACS. 42.25.Bs Wave propagation, transmission and absorption 42.25.Fx Diffraction and scattering 52.27.Lw Dusty or complex plasmas; plasma crystals arXiv:1401.0636v1 [physics.plasm-ph]

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“…The plasma crystal can be subjected to external forces such as those generated by electric and magnetic fields [9][10][11][12] , centrifugal forces 13 , plasma jets 14 , laser beams [15][16][17] , injected charged particle beams [18][19][20][21] or combinations of some of these forces, e.g. laser and magnetic field 22 .…”

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confidence: 99%

“…laser and magnetic field 22 . In all of these cases the complex dynamics of the dust particles within the crystal leads to the observation of interesting physical phenomena such as the dust acoustic or the longitudinal dust lattice waves 23 , solid to liquid phase transitions 5,17,24 , shear induced dust flows 16 , secondary emission 25 , field emission 26 , hypercharging of the dust particles 18,19,27 , dust vortices 20 , and rotation of the dust structure [28][29][30] .…”

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A laboratory platform for studying rotational dust flows in a plasma crystal irradiated by a 10 keV electron beam

Ticoş

Constantin

Mitu

et al. 2023

Sci Rep

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A novel laboratory platform has been designed and built for the irradiation of a plasma crystal (PC) with an electron beam (e-beam) having an energy around 10 keV and a current of tens of milliamperes. The pulsed e-beam collimated to a few millimeter-size spot is aimed at a crystal made of dust particles levitated in a radio-frequency (RF) plasma. The platform consists of three vacuum chambers connected in-line, each with different utility: one for generating free electrons in a pulsed hollow-anode Penning discharge, another for the extraction and acceleration of electrons at $$\sim 10$$ ∼ 10 kV and for focusing the e-beam in the magnetic field of a pair of circular coils, and the last one for producing PCs above a RF-driven electrode. The main challenge is to obtain both a stable e-beam and PC by insuring appropriate gas pressures, given that the e-beam is formed in high vacuum ($$\lesssim 10^{-4}$$ ≲ 10 - 4 Torr), while the PC is produced at much higher pressures ($$\gtrsim 10^{-1}$$ ≳ 10 - 1 Torr). The main diagnostics include a high speed camera, a Faraday cup and a Langmuir probe. Two applications concerned with the creation of a pair of dust flow vortices and the rotation of a PC by the drag force of the e-beam acting on the strongly coupled dust particles are presented. The dust flow can become turbulent as demonstrated by the energy spectrum, featuring vortices at different space scales.

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Superhigh dust charging by high-voltage electron beam

Cited by 9 publications

References 26 publications

Mie Scattering by a Charged Dielectric Particle

Mie Scattering by a Charged Dielectric Particle

Infrared light extinction by charged dielectric core-coat particles

A laboratory platform for studying rotational dust flows in a plasma crystal irradiated by a 10 keV electron beam

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