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Global and local characterization of turbulent and chaotic structures in a dipole-confined plasmaa)
a)Paper UI1 4, Bull. Am. Phys. Soc. 53, 281 (2008).
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View: Figures


Image of FIG. 1.
FIG. 1.

Turbulence in CTX is obtained by gas injection. (a) The low density regime possesses quasiperiodic instability bursts (HEI) which evolve to the megahertz frequency range. (b) High density plasmas have steady turbulence with a high fluctuation level in the few kilohertz range.

Image of FIG. 2.
FIG. 2.

The amplitude of mode , and the respective spatial and temporal modal decomposition. The modes for are plotted corresponding to the azimuthal mode number .

Image of FIG. 3.
FIG. 3.

The Lyapunov spectrum for embedded dimension for the Lorenz system (inset) and density fluctuations in CTX. The largest positive Lyapunov number converges near , yielding a characteristic time of .

Image of FIG. 4.
FIG. 4.

The ensemble-averaged floating potential spectra taken across the plasma radius, . The dashed line indicates for reference.

Image of FIG. 5.
FIG. 5.

Structure of potential fluctuations displaying (red) and (blue) azimuthal modes. Measurements taken by probes separated azimuthally by .

Image of FIG. 6.
FIG. 6.

Dispersion relation and growth rate from the linear contribution . The dispersion is linear at . Marginally damped modes exist in the range below approximately 10 kHz.

Image of FIG. 7.
FIG. 7.

Power is transferred nonlinearly from high frequencies into the spectral region below where the quasicoherent structures exist.

Image of FIG. 8.
FIG. 8.

The spectra , and the computed energy spectrum . The energy spectrum displays a power law for


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Global and local characterization of turbulent and chaotic structures in a dipole-confined plasmaa)