Optical diagnostic and electrical analysis in dusty RF discharges containing plasmoids

Lagrange, Jean-François; Géraud-Grenier, Isabelle; Faubert, François; Massereau-Guilbaud, Véronique

doi:10.1063/1.4934249

Cited by 6 publications

(6 citation statements)

References 48 publications

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“…In several dusty plasma experiments, rotating instabilities have been observed, consisting in the rotation of well-defined plasma regions like rotating voids [5,6] or plasmoids [7][8][9][10]. As in some electronegative plasma experiments [11], the rotation of the nearly entire plasma can also be observed in this soot experiment as shown in Fig.…”

Section: Rotating Plasma Instabilitiesmentioning

confidence: 56%

Nanoparticle growth in ethanol based plasmas

Labidi¹,

Lecas²,

Kovačević³

et al. 2018

AIP Conference Proceedings

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Section: Rotating Plasma Instabilitiesmentioning

confidence: 56%

Nanoparticle growth in ethanol based plasmas

Labidi¹,

Lecas²,

Kovačević³

et al. 2018

AIP Conference Proceedings

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“…In this last case, the number of plasmoids can vary and their regular rotation around the circumference of the electrodes has been reported [31][32][33]. Other kinds of rotating instabilities are known to occur in dusty or electronegative plasmas that are related to the void rotation [25,39,40], to rotating plasmoids in the middle of the interelectrode region [38] or to a more general rotation of the entire plasma [41]. In the present experiments, the regular rotation of plasmoids has been obtained during dust particle growth instabilities (DPGI) [25,28,39,42,43] and detected thanks to high-speed imaging at a few thousands frames per second (fps).…”

Section: High-speed Imaging Of Plasma Emission Instabilities During Dmentioning

confidence: 88%

“…Indeed, the plasma is not globally changing during the rotation of these regions, it is just the places of enhanced emission that are moved. Plasmoids have been observed in several typical laboratory discharges [31][32][33][34][35][36][37][38] but their origin is still unclear. They seem to be favored by electric field disturbances as they are observed in grid holes [37] or preferentially close to guard rings encircling electrodes [31][32][33].…”

Section: High-speed Imaging Of Plasma Emission Instabilities During D...mentioning

confidence: 99%

Optical diagnostics of dusty plasmas during nanoparticle growth

Mikikian

Labidi

Wahl

et al. 2016

Plasma Phys. Control. Fusion

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Carbon-based thin films deposited on surfaces exposed to a typical capacitively-coupled RF plasma are sources of molecular precursors at the origin of nanoparticle growth. This growth leads to drastic changes of the plasma characteristics. Thus, a precise understanding of the dusty plasma structure and dynamics is required to control the plasma evolution and the nanoparticle growth. Optical diagnostics can reveal some particular features occurring in these kinds of plasmas. High-speed imaging of the plasma glow shows that instabilities induced by nanoparticle growth can be constituted of small brighter plasma regions (plasmoids) that rotate around the electrodes. A single bigger region of enhanced emission is also of particular interest: the void, a main central dust-free region, has very distinct plasma properties than the surrounding dusty region. This particularity is emphasized using optical emission spectroscopy with spatiotemporal resolution. Emission profiles are obtained for the buffer gas and the carbonaceous molecules giving insights on the changes of the electron energy distribution function during dust particle growth. Dense clouds of nanoparticles are shown to be easily formed from two different thin films, one constituted of polymer and the other one created by the plasma decomposition of ethanol.

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Section: Basic Phenomenamentioning

confidence: 99%

“…However, it was demonstrated long ago [221] that dust immersed in a gas discharge plasma does not necessarily remain in the thermal equilibrium with neutral gas. Moreover, in dusty plasma, there exist several instabilities that induce different types of regular dust motion, [17,18,120,147,[222][223][224][225][226][227][228][229][230][231][232][233][234][235] some of which will be considered in this review. Dust acoustic wave (DAW) [236] instability is definitely the most common type of instability occurring in laboratory dusty plasmas.…”

Section: Dust Acoustic Wave Instabilitymentioning

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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Optical diagnostic and electrical analysis in dusty RF discharges containing plasmoids

Cited by 6 publications

References 48 publications

Nanoparticle growth in ethanol based plasmas

Nanoparticle growth in ethanol based plasmas

Optical diagnostics of dusty plasmas during nanoparticle growth

Physical aspects of dust–plasma interactions

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