Experimental Observations of Transverse Shear Waves in Strongly Coupled Dusty Plasmas

Pramanik, J.; Prasad, G.; Sen, Abhijit; Kaw, P. K.

doi:10.1103/physrevlett.88.175001

Cited by 113 publications

(63 citation statements)

References 16 publications

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“…2(b) and Fig. 2(c) for different excitation frequencies and are akin to earlier observations of DAWs reported in the literature [6,8,9,22]. Their wavelengths are determined from the still images with the precautions discussed above.…”

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confidence: 79%

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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“…These negatively charged dust particles then levitate near the sheath boundary by balancing electrostatic force and the gravitational force similar to earlier experiments [15][16][17][18][19][20][21][22]. These weakly confined dust particles are then transferred into the main plasma volume by adjusting the discharge parameters of the DC glow.…”

Section: Dust Grain Transport and Trappingmentioning

confidence: 90%

“…This dusty plasma medium is frequently used for studying the Dust Acoustic Waves (DAWs), Dust Transverse Shear Waves (DTSWs), and Dust Acoustic Solitary Waves (DASWs) [15,16]. In this configuration, a steady sate equilibrium dusty plasma volume is only possible when the pressure is more than 0.1 mbar otherwise spontaneous DAWs get triggered.…”

Section: Introductionmentioning

confidence: 99%

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Transport and trapping of dust particles in a potential well created by inductively coupled diffused plasmas

Choudhary

Mukherjee

Bandyopadhyay

2016

Review of Scientific Instruments

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A versatile linear dusty (complex) plasma device is designed to study the transport and dynamical behavior of dust particles in a large volume. Diffused inductively coupled plasma is generated in the background of argon gas. A novel technique is used to introduce the dust particles in the main plasma by striking a secondary direct current (DC) glow discharge. These dust particles are found to get trapped in an electrostatic potential well which is formed due to the combination of the ambipolar electric field caused by diffusive plasma and the field produced by the charged glass wall of the vacuum chamber.According to the requirements, the volume of the dust cloud can be controlled very precisely by tuning the plasma and discharge parameters. The present device can be used to address the underlying physics behind the transport of dust particles, self -excited dust acoustic waves and instabilities. The detailed design of this device, plasma production and characterization, trapping and transport of the dust particle and some of the preliminary experimental results are presented.

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“…Typically charged particle systems can be modeled as Yukawa systems that can have a liquid state 1-3 these include colloids, dense astrophysical plasmas 4 , strongly coupled dusty plasmas 5,6 and magnetized plasma 7 . A Yukawa fluid possesses a memory dependent nonlocal viscoelastic coefficient enabling the propagation of a transverse shear wave that has been experimentally observed in a strongly coupled dusty plasma 8 . Another important characteristic exhibited by strongly coupled fluid is its non Newtonian behavior where the viscosity coefficient changes with velocity shear rate.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear shear wave in a non Newtonian visco-elastic medium

et al. 2012

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An analysis of nonlinear transverse shear wave has been carried out on non-Newtonian viscoelastic liquid using generalized hydrodynamic(GH) model. The nonlinear viscoelastic behavior is introduced through velocity shear dependence of viscosity coefficient by well known Carreau -Bird model. The dynamical feature of this shear wave leads to the celebrated Fermi-Pasta-Ulam (FPU) problem. Numerical solution has been obtained which shows that initial periodic solutions reoccur after passing through several patterns of periodic waves. A possible explanation for this periodic solution is given by constructing modified Korteweg de Vries (mKdV) equation. This model has application from laboratory to astrophysical plasmas as well as biological systems.2

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Experimental Observations of Transverse Shear Waves in Strongly Coupled Dusty Plasmas

Cited by 113 publications

References 16 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

Transport and trapping of dust particles in a potential well created by inductively coupled diffused plasmas

Nonlinear shear wave in a non Newtonian visco-elastic medium

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