Head-on collision of dust-acoustic solitons in a strongly coupled dusty plasma

Abstract

The collision between two counterpropagating dust acoustic solitary waves in a strongly coupled dusty plasma has been observed. The measured velocity and width of the solitary wave agree with the solution of the Korteweg-de Vries equation derived by using the generalized hydrodynamic model. The two counterpropagating solitary waves of equal amplitude merge into a single pulse with twice the individual soliton amplitude and then pass through each other. The solitons suffer a small time delay in propagation after collision. The measured delay time obtained from their trajectories is also presented.

Head-on collision of dust acoustic solitons in a nonextensive plasma with variable size dust grains of arbitrary charge

“…The meaning of negative phase shift after the collision is that the trajectories of the propagated solitons are behind what would be expected if they just passed through each other with no interaction. In other words, each soliton is lagging its corresponding case of no collision [24,25,32].…”

“…Recently, Zhang et al [30] studied the head-on collision and the overtaking process between a Korteweg-de Vries (KdV) solitary wave and an envelope solitary wave in a dusty plasma using the particle-in-cell simulation method. In plasma experiments, two experimental observations [31,32] have been reported on the head-on collision of two counterpropagating solitons in plasma.…”

Longitudinal dust acoustic solitary waves in a strongly coupled complex (dusty) plasma

“…In this case, the coupling parameter is defined as Γ = Γ C exp(−κ), where Γ C = q 2 d /(k B aT d ) is the Coulomb coupling parameter, κ = a/λ D is the screening parameter (lattice parameter), q d (= Ze) is the charge on each dust particle, Z is the number of elementary electronic charge e, a( n −1/3 d ) is the inter-dust distance, n d is the dust density, T d is the dust temperature, λ D is the plasma Debye length and k B is the Boltzmann constant. Experimental findings (Thomas and Morfil 1996) suggest the existence of liquid or solid like behavior of the dusty plasma medium in the strong correlation regime characterized by Γ 1. In the regime 1 Γ < Γ cr (where Γ cr is the critical value of coupling parameter beyond which the system becomes crystalline), the dusty plasma behaves like a mixture of liquid and solid i.e.…”

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

“…However, 3D dust structure with less extent (nearly 10 mm) is formed above the rf electrode which still suits to perform the wave experiments [20,21]. A larger 2D dusty plasma crystal can be formed in rf operated discharges at lower pressure for wave and flow studies [22,23]. Apart from these above methods, diffused edge of inductively glow plasma is used to confine the dust particles by Fortov et al [24].…”

“…The collective properties of this medium provide an identity similar to plasma thus it is termed as "dusty plasma". Such type of plasmas are encountered in industrial plasma [2,3], space plasma [4,5], fusion devices [6,7], and laboratory plasmas [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”