Modified Potential Around a Moving Test Charge in Strongly Coupled Dusty Plasma

Abstract

The theory of dynamical (wake) potential behind a moving test charge in a weakly coupled dusty plasma is extended to that including of strong interaction between dust grains. Such strong interaction is included in the dielectric response function by a generalized hydrodynamic (GH) fluid model. It is shown that the strong interaction between dusts including the lattice spacing correction has a significant effect on the wake potential in dusty plasma. This may be used to investigate basic features of phase transition and possibility of lattice formation of dusty plasma.

On the dielectric response function and dispersion relation in strongly coupled magnetized dusty plasmas

“…The above dispersion relation includes the combined effects of external magnetic field, obliqueness, and strong correlation between dust grains. It extends the previous results [9,18] to the case of magnetized strongly coupled dusty plasma situations. Now let ω → ω + iδ in the dispersion relation and assume δ ω, we obtain the real and imaginary parts of the wave frequency as…”

“…The present article advances some previous studies [9,18,32,33] with the inclusion of an external magnetic field and the effect of the obliqueness of propagation in strongly coupled dusty plasma. It is shown that the external magnetic field as well as the obliqueness parameter can significantly modify the basic features of the wave propagation in an SCDMP system.…”

“…After the pioneering work of Ikezi, [1] the studies on the propagation characteristics of dust acoustic (DA) waves in strongly coupled dusty plasmas have received significant attention due to their fascinating aspects from practical points of view. [1][2][3][4][5] Depending on the coupling strength of dust grains, dusty plasma may be identified in strongly (Γ 1) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] or weakly (Γ 1) [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31] coupled regimes (with Γ being the coupling parameter defined by Γ = q 2 d exp(−a d /λ d )/a d k B T d , where q d = eZ d is the dust grain charge, a d is the inter-particle distance, T d is the dust kinetic temperature, and λ d is the Debye length). The existence of such weakly and strongly coupled regime in dusty plasma has been theoretically predicted by Ikezi.…”

“…We found that the strong correlation of charged dust grains modifies both the existing dust acoustic and dust-cyclotron modes in magnetized dusty plasmas. [15] There are several models [9][10][11]15,32] to study the dynamics of a strongly correlated plasma, i.e., the generalized hydrodynamic model, [9,10,18] the quasilocalized charge approximation, [42][43][44] the local field corrections method, [45] the thermodynamic, [46] and the fluid [11,15] models. However, we employ the generalized hydrodynamic (GH) model that includes the effects of strong correlation via the visco-elastic coefficients.…”

Test charge driven response of a dusty plasma with polarization force

“…Since then, many investigations have been made to explain the wakefield potential distribution in different scenarios (Lemons et al, 2000;Ali, 2009;Ali, 2016). The dielectric response function and modified potential distribution around a test charge have also been studied in strongly coupled unmagnetized and magnetized dusty plasmas (Shahmansouri et al, 2017;Shahmansouri and Khodabakhshi, 2018;Shahmansouri, 2019).…”