Dust acoustic waves in a direct current glow discharge

Thompson, C.; Barkan, A.; D’Angelo, N.; Merlino, R. L.

doi:10.1063/1.872238

Cited by 264 publications

(141 citation statements)

References 18 publications

Supporting

Mentioning

133

Contrasting

Order By: Relevance

“…The observations of DAWs and measurements of dust-acoustic (sound) velocities have been used to obtain useful information about dusty plasmas systems under various conditions [4][5][6][7][8][9][10][11][12][13][14][15] (we mainly concentrate on three-dimensional particle clouds here, which is also reflected in the reference list). In particular, experimentally measured DAW dispersion relations and sound velocities have been repeatedly used to estimate the electrical charge of particles in dusty plasmas under laboratory and microgravity conditions [16][17][18][19][20], employing various experimental techniques.…”

Section: Introductionmentioning

confidence: 99%

Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas

Khrapak¹,

Thomas²

2015

Phys. Rev. E

View full text Add to dashboard Cite

The conventional fluid description of multi-component plasma, supplemented by an appropriate equation of state for the macroparticle component, is used to evaluate the longitudinal sound velocity of Yukawa fluids. The obtained results are in very good agreement with those obtained earlier employing the quasi-localized charge approximation and molecular dynamics simulations in a rather broad parameter regime. Thus, a simple yet accurate tool to estimate the sound velocity across coupling regimes is proposed, which can be particularly helpful in estimating the dust-acoustic velocity in strongly coupled dusty (complex) plasmas. It is shown that, within the present approach, the sound velocity is completely determined by particle-particle correlations and the neutralizing medium (plasma), apart from providing screening of the Coulomb interaction, has no other effect on the sound propagation. The ratio of the actual sound velocity to its "ideal gas" (weak coupling) scale only weakly depends on the coupling strength in the fluid regime, but exhibits a pronounced decrease with the increase of the screening strength. The limitations of the present approach in applications to real complex plasmas are briefly discussed.

show abstract

Section: Introductionmentioning

confidence: 99%

Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas

Khrapak¹,

Thomas²

2015

Phys. Rev. E

View full text Add to dashboard Cite

show abstract

“…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.…”

mentioning

confidence: 99%

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

et al. 2007

View full text Add to dashboard Cite

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...

show abstract

“…It has recently been claimed by Dwivedi 1 that the dustacoustic wave ͑DAW͒, introduced as a theoretical concept in the seminal paper by Rao et al 2 and experimentally verified afterwards, 3 should not be viewed as a novel plasma wave, but as a special case of the so-called acoustic-like mode ͑ALM͒ introduced a year earlier by Dwivedi et al 4 There are several reasons to dispute this criticism by Dwivedi. 1 One basic reason has to do with the model used in the Dwivedi et al paper, 4 which rests physically on very dubious grounds, because it considers a plasma with two ion species in the presence of a fixed electron background.…”

Section: Frank Verheest A)mentioning

confidence: 92%

“…A distinct name is now also proper following their experimental verification. 3 If one now claims that this mode is not new enough, then everything discovered the last thirty years can be said to be contained in the old standard results, as we have shown here, and the whole of plasma literature would be useless because it is implicitly hidden in previous work. However, progress is made by pointing out new applications of sometimes old formulations, which perhaps should have been thought of earlier but clearly were not.…”

Section: Frank Verheest A)mentioning

confidence: 97%

Comment on “Is dust acoustic wave a new plasma acoustic mode?” [Phys. Plasmas 4, 3427 (1997)]

Verheest

1998

Physics of Plasmas

View full text Add to dashboard Cite

Dwivedi’s claim [Phys. Plasmas 4, 3427 (1997)] that the dust-acoustic wave should not be viewed as a novel plasma wave is rebutted. The so-called acoustic-like mode introduced earlier by Dwivedi et al. [J. Plasma Phys. 41, 219 (1989)] rests physically on very dubious grounds, because it considers a plasma with two ion species in the presence of a fixed electron background. In addition, Dwivedi et al. have nowhere included heavy charged dust grains as potential applications of their (flawed) theoretical treatment. Hence Rao et al. (1990) were indisputably the first ones to point out the possibility of dust-acoustic modes, correctly so, as we argue, because a distinct name is fully justified by the enormous order-of-magnitude differences in the charge-to-mass ratios of the usual charged dust grains compared to “ordinary” ions and by the recent experimental verification.

show abstract

Dust acoustic waves in a direct current glow discharge

Cited by 264 publications

References 18 publications

Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas

Fluid approach to evaluate sound velocity in Yukawa systems and complex plasmas

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

Comment on “Is dust acoustic wave a new plasma acoustic mode?” [Phys. Plasmas 4, 3427 (1997)]

Contact Info

Product

Resources

About