Volumetric measurement of the synchronization and desynchronization of the dust acoustic wave with an external modulation

Abstract

A spatio-temporal measurement showing the volumetric nature of the phase synchronization of a naturally occurring dust acoustic wave to an external modulation and the relaxation from the driven wave mode back to the naturally occurring wave mode (phase desynchronization) is presented. It is shown that the phase synchronization and desynchronization occur behind a propagating synchronization/desynchronization front that travels at a slower speed than the phase velocity of the wave and that the speed of this synchronization/desynchronization front decreases with increasing neutral gas pressure. It is also observed that volume of the wave that is synchronous depends on the frequency of the external modulation and the neutral gas pressure.

Perspective: dusty plasma experiments—a learning tool for physics graduate students

“…One can also identify the nonlinear characteristics of DAWs after comparing the intensity profile of propagating DAWs with theoretical obtained nonlinear waves in dusty plasma [32,54,55]. There is also a possibility to modulate the self-excited DAWs [56] and excite the linear and nonlinear waves in the dust grain medium by external forcing [57]. As a result of the modulation of self-excited DAWs with external forcing, the synchronization of waves is expected to be observed [56,58].…”

“…There is also a possibility to modulate the self-excited DAWs [56] and excite the linear and nonlinear waves in the dust grain medium by external forcing [57]. As a result of the modulation of self-excited DAWs with external forcing, the synchronization of waves is expected to be observed [56,58]. In summary, it would be interesting for undergraduate and postgraduate students to explore the linear and nonlinear waves in the dust grain medium that relate wave motion in different mediums (gas/liquid/solid).…”

Nonlinear Wave Synchronization in a Dusty Plasma Under Microgravity on the International Space Station (ISS)

“…Killer and Melzer [35] used a capacitively coupled RF plasma to demonstrate that strongly nonlinear DAWs can exhibit global coherence with high levels of synchronization. Aside from these studies, where the nonlinear interactions were among the waves themselves, there has also been a demonstration that a nonlinear interaction of a DAW with an externally driven sinusoidal modulation of the plasma can cause the DAW to synchronize with the modulation [31], [34].…”

Spatial distribution of Dust Density Wave Properties in Fluid Complex Plasmas

“…In complex plasmas, the ion-dust streaming instability [9] causes the self-excitation of longitudinal waves called dust acoustic waves (DAWs) [10][11][12][13] or dust density waves (DDWs) [14][15][16]. DAWs were first predicted by Rao, Shukla and Yu [17] and have since been extensively studied theoretically as well as experimentally using ground based setups [18][19][20][21], and microgravity experiments on the International Space Station (ISS) [22,23], and on parabolic flights [24]. The DDWs usually move in the direction of the ion flow.…”