Wave-Particle Dynamics of Wave Breaking in the Self-Excited Dust Acoustic Wave

Abstract

The wave-particle microdynamics in the breaking of the self-excited dust acoustic wave growing in a dusty plasma liquid is investigated through directly tracking dust micromotion. It is found that the nonlinear wave growth and steepening stop as the mean oscillating amplitude of dust displacement reaches about 1/k (k is the wave number), where the vertical neighboring dust trajectories start to crossover and the resonant wave heating with uncertain crest trapping onsets. The dephased dust oscillations cause the abrupt dropping and broadening of the wave crest after breaking, accompanied by the transition from the liquid phase with coherent dust oscillation to the gas phase with chaotic dust oscillation. Corkscrew-shaped phase-space distributions measured at the fixed phases of the wave oscillation cycle clearly indicate how dusts move in and constitute the evolving waveform through dust-wave interaction.

Dust-acoustic shock waves in a magnetized non-thermal dusty plasma

“…The latter have been found to be in good agreement by an experimental observation of DA shock waves by Heinrich et al (2009). Recently, motivated by the experimental observation of DA shock structures by Heinrich et al (2009), Bandyopadhyay et al (2008, Teng et al (2009), andShukla andEliasson (2012) presented a fully nonlinear theory for DA shock and solitary pulses in a strongly coupled dusty plasma by employing a generalized hydrodynamic model, and they related their results to low temperature dusty plasma discharges. The DA shock waves in a dusty plasma with charge fluctuating dust and superthermal plasma particles have also been investigated (Tribeche and Bacha 2010;Shahmansouri and Alinejad 2013a;Shahmansouri and Tribeche 2013).…”

Longitudinal singular response of dusty plasma medium in weak and strong coupling limits

“…Recently, a number of experimental groups have reported the formation of cusp structures in the context of dusty plasmas. While Schwabe et al 21 have observed such structures on the surface of voids formed in the dusty plasma system, the wave breaking experiments conducted by Teng et al 11 are suggestive of cusp formation in the bulk. Against this backdrop, we report the first observations of cusp formation in the 1-D numerical simulation of both weakly and strongly coupled dusty plasma medium.…”

“…Our observations are of particular significance keeping in view some recent experiments where such cusp structures in density are seen to form spontaneously. 11 In the strong coupling regime of the dust fluid, we show that the GHD equations do not allow any localized smooth stationary solutions. The reductive perturbative approach does not lead to the simplified KdV form for the equations in the low amplitude limit.…”

Stereoscopic imaging of dusty plasmas

“…Recently, the microphysics of particle motions in the crests and troughs, as well as the trapping of particles in the wave crest, have been of interest (Hou & Piel 2008;Teng et al 2009;Chang, Teng & I 2012;Himpel et al 2014). Since the observation of a 2-D slice of the dust can only give a limited view on the particle dynamics, it is beneficial to measure the 3-D particle motion.…”