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Experimental study of the electromagnetic component of drift-wave turbulence

K Rahbarnia1,3, E Holzhauer1, N Mahdizadeh2, M Ramisch1 and U Stroth1

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The magnetic turbulent fluctuation spectrum is investigated in the core of a toroidally confined plasma with parameters similar to those in the fusion edge plasma. The measured spectra show fully developed turbulence over almost 6 decades down to the range of nano-Tesla field amplitudes. The magnetic fluctuations are interpreted as being due to the parallel dynamics of drift-wave turbulence. The predicted strong β dependence of the magnetic fluctuations is experimentally confirmed. For the present parameters, anomalous transport due to the magnetic turbulence can be neglected compared with the electrostatic contribution.


PACS

52.35.Ra Plasma turbulence

52.25.Fi Transport properties

52.35.Kt Drift waves

52.40.Hf Plasma-material interactions; boundary layer effects

52.25.Gj Fluctuation and chaos phenomena

Subjects

Plasma physics

Dates

Issue 8 (August 2008)

Received 13 November 2007, in final form 26 March 2008

Published 4 June 2008



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