title: Observation of multifractal intermittent dust-acoustic-wave turbulence.
abstract: Intermittent dust acoustic wave turbulence self-excited by downward ion flow in dissipative dusty plasma is experimentally observed and investigated. The power spectra of the temporal dust density fluctuation show distinct bumps in the low-frequency regime and power-law scaling in the high-frequency regime. The structure-function analysis demonstrates the multifractal dynamics of the wave turbulence. Decreasing dissipation by decreasing neutral pressure leads to a more turbulent state with a less distinct low-frequency bump in the power spectrum, more stretched non-Gaussian tails in the histogram of the wave-height increment at a small time interval τ, and a higher degree of multifractality. The loss of long time memory with increasing τ for a more turbulent state causes a change from the distribution with stretched non-Gaussian tails to Gaussian with increasing τ.
authors.affiliation: Department of Physics and Center for Complex Systems, National Central University, Jhongli, Taiwan 32001, Republic of China.
authors.forename: Ya-Yi
authors.initials: YY
authors.lastname: Tsai
authors.forename: Mei-Chu
authors.initials: MC
authors.lastname: Chang
authors.forename: I
authors.initials: I
authors.lastname: Lin