Observation of dust acoustic shock wave in a strongly coupled dusty plasma

Abstract

Dust acoustic shock wave is observed in a strongly coupled laboratory dusty plasma. A supersonic flow of charged microparticles is allowed to perturb a stationary dust fluid to excite dust acoustic shock wave. The evolution process beginning with steepening of initial wave front and then formation of a stable shock structure is similar to the numerical results of the Korteweg-de Vries-Burgers equation. The measured Mach number of the observed shock wave agrees with the theoretical results. Reduction of shock amplitude at large distances is also observed due to the dust neutral collision and viscosity effects. The dispersion relation and the spatial damping of a linear dust acoustic wave are also measured and compared with the relevant theory.

Electrostatic shock structures in dissipative multi-ion dusty plasmas

“…Linearizing the dimensionless system of evolution equations (6) - (10) and Fourier transforming, we readily obtain the dielectric function…”

“…In order to derive KdVB equation (26), first we have introduced the coordinate transformation (16), from {x, t} to {ξ, τ }, onto Eqs. (6)- (10). Then, we have perturbed the plasma quantities {n j , u j , ϕ} around the equilibrium state {1, 0, 0}, as described by Eqs.…”

“…Heinrich et al [9] later used high-speed video imaging to study self-excited dust acoustic shock waves observed in a dc glow discharge. Recently, by using a supersonic flow of charged microparticles, a finite amplitude dust acoustic shock wave was observed in a strongly coupled laboratory dusty plasma [10]. The balancing between wave steepening due to an increase in the dust density and dissipation due to dust-neutral collisions and viscosity effects was thus shown experimentally to lead to the formation of steady state shockwaves.…”

Formation of highly nonlinear dust-acoustic solitary waves due to high-temperature electrons and ions

“…We would like to consider a collisionless unmagnetized dusty plasma containing Maxwellian ions, nonthermal ions, nonextensive electrons, superthermal electrons and negatively charged mobile dust fluid. Some authors [28][29][30] have studied these types of dusty plasmas theoretically while some others [31][32][33] have studied experimentally. The restoring force and the inertia which are the preconditions for the formation of dust-acoustic waves come, respectively, from the electron or ion thermal pressure and the dust mass.…”

Shock width measured under liquid and solid conditions in a 2D dusty plasma

“…The video microscopy diagnostics that are commonly used for laboratory dusty plasmas allow the experimenter to observe the sample at the microscopic level, tracking individual particles, and making time-resolved in-situ measurement profiles of useful quantities, such as number density. These advantages have led to many studies in the literature for dusty plasmas [10,11,[13][14][15][16][17][18][19][20][21][22].…”