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Characterizing Interchange Turbulence In A Dipole Confined Plasma

Author: B. A. Grierson
Requested Type: Poster Only
Submitted: 2006-12-18 20:14:43

Co-authors: M.W. Worstell, S. Stattel, M.E. Mauel

Contact Info:
Columbia University
500 West 120th Street
New York, NY   10027
USA

Abstract Text:
The dipole magnetic field has closed field-lines without
magnetic shear, and this confinement configuration allows
large-sized fluting instabilities. When dipole-confined plasma
is produced with ECRH, fast Hot Electron Instabilities (HEI)
appear at low densities, and slower turbulent fluctuations
occur at higher densities. The global mode structures of the
fast HEI instability and centrifugal interchange are
understood. However, the characteristics of the turbulent
interchange fluctuations ( that occur between HEI bursts and
when the HEI is suppressed by fueling) are less well
understood. These low frequency, non-stationary fluctuations
exhibit a power-law like turbulence spectrum and intermodal
coupling. Correlation analysis, modal decomposition Hilbert
methods, time-frequency spectrograms, and bicoherence are
used to characterize interchange turbulence in a dipole and to
form a basis for understanding nonlinear plasma mixing.

Characterization: A2,A3

Comments:
Please place with other dipole posters.