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Measurements of Impurity Transport Due to Drift-Wave Turbulence in a Toroidal Plasma
T Nishizawa1, M D Nornberg1, J Boguski1
1Department of Physics, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.
Abstract:
The first direct measurements of an impurity particle flux driven by drift-wave turbulence in a toroidal magnetized plasma are reported. The correlation between the impurity density and radial velocity fluctuations is measured using ion Doppler spectroscopy. The small, very fast radial velocity fluctuation is resolved with the aid of a new linearized spectrum correlation analysis method that rejects uncorrelated noise as the sample size increases. The measured C^{2+} turbulent impurity flux in the edge of the plasma is directed inward and is consistent with impurity density measurements. This is also the first direct evidence for fluctuation-induced transport due to trapped-electron-mode turbulence in reversed field pinch plasmas.
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