Trapping of dust and dust acoustic waves in laboratory plasmas

Prabhakara, H. R.; Tanna, V. L.

doi:10.1063/1.871620

Cited by 150 publications

(63 citation statements)

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“…Zb, 52.35.Fp, 52.25.Ub Dust acoustic waves (DAWs), which are the analogs of ion acoustic waves in a dusty plasma, have received a great deal of attention in recent years. Their linear and nonlinear propagation characteristics have been the subject of a large number of theoretical [1][2][3][4][5] and experimental [6][7][8][9][10][11][12] investigations. One of the important and fundamental questions related to their dispersion properties concerns the effect of dust-dust correlations.…”

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confidence: 99%

Experimental observation of strong coupling effects on the dispersion of dust acoustic waves in a plasma

et al. 2007

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The dispersion properties of low frequency dust acoustic waves in the strong coupling regime are investigated experimentally in an argon plasma embedded with a mixture of kaolin and M nO2 dust particles. The neutral pressure is varied over a wide range to change the collisional properties of the dusty plasma. In the low collisional regime the turnover of the dispersion curve at higher wave numbers and the resultant region of ∂ω/∂k < 0 are identified as signatures of dust-dust correlations. In the high collisional regime dust neutral collisions produce a similar effect and prevent an unambiguous identification of strong coupling effects.PACS numbers: 52.25. Zb, 52.35.Fp, 52.25.Ub Dust acoustic waves (DAWs), which are the analogs of ion acoustic waves in a dusty plasma, have received a great deal of attention in recent years. Their linear and nonlinear propagation characteristics have been the subject of a large number of theoretical [1][2][3][4][5] and experimental [6][7][8][9][10][11][12] investigations. One of the important and fundamental questions related to their dispersion properties concerns the effect of dust-dust correlations. These correlation effects are deemed to be important because dusty plasmas are usually in the strongly coupled regime on account of the large amount of charge on each dust particle and its relatively low thermal velocity., the ratio of the dust Coulomb energy to the dust thermal energy is widely used as a measure of the amount of coupling. Here, Z d , d, T d , λ p denote the dust charge, the interparticle distance, the dust particle temperature and the plasma Debye length respectively. The value of this parameter, which is based on the Yukawa model, provides a broad indication of the phase of a dusty plasma i.e. whether it is in a gaseous (Γ < 1), fluid (1 < Γ < Γ c ) or solid state (Γ > Γ c ). Here Γ c is the critical value of Γ marking a phase transition point. It should be mentioned that a number of recent works [13,14] have suggested important modifications to the expression for Γ and Γ c near a critical curve. In general, when Γ >> 1 in a dusty plasma, dust-dust correlations can lead to the development of short range order in the system which keeps decaying and reforming in time. Such correlation effects can bring about significant modifications in the collective properties of the strongly coupled dusty plasma [15][16][17][18]. The influence of dust-dust correlation on DAWs was addressed in an early experiment by Pieper and Goree [8] who studied the propagation of DAWs in a dusty plasma that was close to a crystalline state. The expectation was that the linear dispersion relation of the excited compressive waves would be close to dust-lattice waves -DLWs (evidence of a strongly correlated medium) rather than that of DAWs which are typically found in a gaseous weakly coupled plasma. To their surprise they found that the dispersion properties were well explained by collisionally damped DAWs and showed no resemblance to DLWs. Their experimental findings also lent credence to t...

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Experimental observation of strong coupling effects on the dispersion of dust acoustic waves in a plasma

et al. 2007

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“…Beyond experiments on charging or waves, other research groups have performed a variety of dusty plasma investigations with these sources. As one example, studies by Prabhakara and Tanna [26] reported on the transport of microparticle through the sheath region as well as the presence of dust acoustic waves in the plasma. Other researchers, such as Arnas, et al [61] in France and Adkihari, et al [62] in India have used the hot filament discharge to explore how the presence of the charged microparticles affect the sheath region of the plasma.…”

Section: Hot Filament Dischargementioning

confidence: 97%

“…This early work was eventually extended to studies of microparticle confinement in the sheath region of the plasma [55]. Moreover, other groups have used similar approaches in hot filament discharges to study grain charging [26], [56]. A schematic drawing of their original experimental arrangement is shown in Fig.…”

Section: Hot Filament Dischargementioning

confidence: 98%

“…In spite of these differences, dc-generated dusty plasmas have been shown to be an excellent platform for fundamental investigations of particle charging, [19], [20], [21], [22] a wide variety of collective effects including both dust-modified plasma waves [23], [24] and dust-driven waves, [25], [26], [27], [28], [29], [30], [31], [32] three-dimensional shaping effects, [33], [34], [35], [36], [37] and thermodynamic properties. [38], [39], [40], [41] The dc-generated dusty plasma enables a range of experimental studies that are distinct from, yet complementary with, studies in rf-generated dusty plasmas.…”

Section: Introductionmentioning

confidence: 99%

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Dust Clouds in Dc‐Generated Dusty Plasmas: Transport, Waves, and Three‐Dimensional Effects

Thomas¹

2009

Contrib. Plasma Phys.

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The study of dusty plasmas in dc‐generated plasmas is a broad topic because of the wide variety of experimental configurations that fall under the category of “dc plasma source”. Experimental configurations such as the hot filament discharge, anodic (anode/cathode) discharge, and Q‐machine are all variations of the “dc plasma source” in which extensive studies of dusty plasmas have been performed. This paper will review dusty plasma investigations in these plasma sources. First, an introduction to each of these configurations and representative examples of each one will be given. This will be followed by a discussion of microparticle confinement in each of these configurations. Then, key results from dusty plasma investigations using these devices will be discussed. Specific emphasis will be placed on studies of: microparticle charging, particle cloud morphology, dust‐driven and dust‐modified waves, and strongly coupled effects. Some remarks on emerging research areas will be given at the end (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…DDWs are compressional and rarefactive waves of the dust component excited by an ion flow through the dust ensemble (Barkan, Merlino & D'Angelo 1995;Prabhakara & Tanna 1996;Khrapak et al 2003;Schwabe et al 2007;Hou & Piel 2008;Merlino 2009;Thomas 2009;Arp et al 2010;Flanagan & Goree 2010;Menzel et al 2010;Himpel et al 2014;Williams 2014). These waves have frequencies of the order of 10 Hz and wave speeds of the order of a few centimetres per second.…”

Section: Example Of Measurementmentioning

confidence: 99%

Stereoscopic imaging of dusty plasmas

et al. 2016

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The fundamentals of stereoscopy and their application to dusty plasmas are described. It is shown that stereoscopic methods allow us to measure the three-dimensional particle positions and trajectories with high spatial and temporal resolution. The underlying technical implications are presented and requirements and limitations are discussed. The stereoscopic method is demonstrated for dust particles in dust-density waves under microgravity conditions.

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Trapping of dust and dust acoustic waves in laboratory plasmas

Cited by 150 publications

References 17 publications

Experimental observation of strong coupling effects on the dispersion of dust acoustic waves in a plasma

Experimental observation of strong coupling effects on the dispersion of dust acoustic waves in a plasma

Dust Clouds in Dc‐Generated Dusty Plasmas: Transport, Waves, and Three‐Dimensional Effects

Stereoscopic imaging of dusty plasmas

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