Abstract/Details

Experimental Characterization of Drift-Wave Turbulence in the Sheared, Cylindrical Slab


2009 2009

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Abstract (summary)

Plasma turbulence on a uniform density gradient with unfavorable magnetic curvature is investigated extensively in the Helimak device. The turbulence is strong with density and electrostatic potential fluctuation levels in excess of 40%. Measurements of the dispersion relation, kz, and k|| identify the fluctuations with drift-waves, which propagate in the poloidal direction at the diamagnetic drift velocity and have a small, but finite parallel wavenumber. A non-zero phase shift between the density and potential fluctuations gives rise to turbulent cross-field particle transport, which is measured using spectral techniques. In addition, the electrostatic drift-wave fluctuations have a small magnetic component that is driven by the turbulent parallel current ||. An examination of nonlinear processes associated with the plasma turbulence uncovers high levels of intermittency near the plasma edge and long-time persistence of the density fluctuations on the order of the parallel confinement time. An analysis of the bispectrum confirms the existence local and nonlocal three-wave interactions between unstable drift-waves although the turbulent saturation of the density fluctuation spectrum is likely due nonlinear processes acting in the time domain.

Indexing (details)


Subject
Plasma physics
Classification
0759: Plasma physics
Identifier / keyword
Pure sciences; Cylindrical slab; Drift waves; Helimak; Plasma; Sheared slab; Turbulence
Title
Experimental Characterization of Drift-Wave Turbulence in the Sheared, Cylindrical Slab
Author
Lee, Kevin
Number of pages
244
Publication year
2009
Degree date
2009
School code
0227
Source
DAI-B 72/03, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781124441382
Advisor
Gentle, Kenneth W.
Committee member
Bengtson, Roger D.; Hallock, Gary; Hazeltine, Richard D.; Horton, Wendell
University/institution
The University of Texas at Austin
Department
Physics
University location
United States -- Texas
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3439266
ProQuest document ID
851537982
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/851537982
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