1. Observation of 3D defect mediated dust acoustic wave turbulence with fluctuating defects and amplitude hole filaments
- Author
-
Mei-Chu Chang, Ya-Yi Tsai, and Lin I
- Subjects
Physics ,Dusty plasma ,Condensed matter physics ,Oscillation ,business.industry ,Wave turbulence ,Phase (waves) ,Acoustic wave ,Condensed Matter Physics ,Plasma oscillation ,Transverse plane ,Amplitude ,Optics ,business - Abstract
We experimentally demonstrate the direct observation of defect mediated wave turbulence with fluctuating defects and low amplitude hole filaments, from a 3D self-excited plane dust acoustic wave in a dusty plasma by reducing dissipation. The waveform undulation is found to be the origin for the amplitude and the phase modulations of the local dust density oscillation, the broadening of the sharp peaks in the frequency spectrum, and the fluctuating defects. The corrugated wave crest surface also causes the observed high and low density patches in the transverse (xy) plane. Low oscillation amplitude spots (holes) share the same positions with the defects. Their trajectories in the xyt space appear in the form of chaotic filaments without long term predictability, through uncertain pair generation, propagation, and pair annihilation.
- Published
- 2013