Rotation of a strongly coupled dust cluster in plasma by the torque of an electron beam

Ticoş, D.; Scurtu, A.; Williams, Jeremiah; Scott, Lori; Thomas, E.; Sanford, Dustin; Ticoş, C. M.

doi:10.1103/physreve.103.023210

Cited by 4 publications

(3 citation statements)

References 48 publications

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“…A quasi 2D crystal made of similar dust particles as in the previously presented experiment was irradiated with the e-beam which was slightly misaligned relative to the center of the crystal, in a similar fashion presented in ref. 30 . Thus, a side of the crystal was more exposed to the e-beam than the rest of it with the e-beam impinging on the irradiated dust particles positioned at the edge.…”

Section: Rotational Dust Flow Applicationsmentioning

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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confidence: 99%

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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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Section: Rotational Dust Flow Applicationsmentioning

confidence: 99%

mentioning

confidence: 99%

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

Self Cite

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show abstract

“…This force can usually be neglected in studying the dust dynamics, except for certain specific conditions in a dc discharge [ 56 ] or in case when electron beams of keV energy are introduced into the plasma. [ 57 ] The neutral drag force can be estimated using the results from the kinetic theory of gases. Typically, the dust particle size is much smaller than the mean free path for the neutral‐neutral collisions in gas.…”

Section: Basic Processesmentioning

confidence: 99%

Physical aspects of dust–plasma interactions

Pustylnik

Pikalev

Zobnin

et al. 2021

Contributions to Plasma Physics

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Low‐pressure gas discharge plasmas are known to be strongly affected by the presence of small dust particles. This issue plays a role in the investigations of dust particle‐forming plasmas, where the dust‐induced instabilities may affect the properties of synthesized dust particles. Also, gas discharges with large amounts of microparticles are used in microgravity experiments, where strongly coupled subsystems of charged microparticles represent particle‐resolved models of liquids and solids. In this field, deep understanding of dust–plasma interactions is required to construct the discharge configurations which would be able to model the desired generic condensed matter physics as well as, in the interpretation of experiments, to distinguish the plasma phenomena from the generic condensed matter physics phenomena. In this review, we address only physical aspects of dust–plasma interactions, that is, we always imply constant chemical composition of the plasma as well as constant size of the dust particles. We also restrict the review to two discharge types: dc discharge and capacitively coupled rf discharge. We describe the experimental methods used in the investigations of dust–plasma interactions and show the approaches to numerical modelling of the gas discharge plasmas with large amounts of dust. Starting from the basic physical principles governing the dust–plasma interactions, we discuss the state‐of‐the‐art understanding of such complicated, discharge‐type‐specific phenomena as dust‐induced stratification and transverse instability in a dc discharge or void formation and heartbeat instability in an rf discharge.

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Quantum mechanical approach to plasma waves with helical wavefront

Ishihara

2023

Physics of Plasmas

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Plasma waves with helical wavefront are studied theoretically from the quantum mechanical viewpoint and are shown to produce a spinning motion of a charged macroparticle in a complex plasma. The electrostatic helical perturbations are described by the wave function for a Laguerre–Gaussian beam mode with the radial/angular mode numbers n/l. The interaction and the transfer of angular momentum from the wave to a particle are analyzed by the method of second quantization with the help of the Feynman diagram. Laguerre function, instead of the Born approximation, is introduced to describe plasma waves with helical wavefront. A pair of dust particles in a complex plasma exchange a quasiparticle (virtual plasmon) resulting in the acquisition of angular momentum, which makes a dust particle spin in motion with rotational frequency Ωϕ. The resonance condition ω−kvz−lΩϕ=0 and the conservation of angular momentum IdΩϕ=lℏ determine the rotational frequency, where ω and k are frequency and axial wave number of the helical wave, and vz and Id are axial velocity and the moment of inertia of a dust particle.

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Rotation of a strongly coupled dust cluster in plasma by the torque of an electron beam

Cited by 4 publications

References 48 publications

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

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

Physical aspects of dust–plasma interactions

Quantum mechanical approach to plasma waves with helical wavefront

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