Community Research and Development Information Service - CORDIS


Internal small-scale magnetic turbulence is a serious candidate to explain the anomalous heat transport in tokamaks. This turbulence is still little known in the gradient region of large machines. In this work internal magnetic fluctuations are measured on Tore Supra with an original diagnostic: cross polarization scattering (CPS). This new experimental tool relies on the eigenmode change of a probing polarized microwave beam scattered by magnetic fluctuations, close to a cut-off layer for the incident wave.
In this work, the diagnostic is first qualified to assess its sensitivity to magnetic fluctuations, and the spatial localisation for its measurements. The magnetic fluctuation behaviour is then analysed over a wide range of plasma current, density and additional power, and interpreted with a simple 1-dimensional scattering model. With all measurements, it is also possible to look for a simple local parameter correlated to the turbulence in a large domain of plasma conditions.

Additional information

Authors: COLAS L, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Report: EUR-CEA-FC-1591 FR (1996) 181pp.
Availability: Available from Association Euratom-CEA, CEN Cadarache, 13108 Saint-Paul-lez-Durance (FR)
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