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Magnetic fluctuations are measured by a cross polarization scattering (CPS) diagnostic in TORE SUPRA. These fluctuations are investigated quantitatively in the ohmic and low confinement regimes over a wide range of plasma currents, densities and additional heating powers. Simultaneously, electron heat diffusivities expected from these fluctuations are compared to those obtained by profile analysis. Three main results are obtained:
a radial profile of the magnetic fluctuations in the gradient region is established from these measurements (magnetic fluctuation levels increase towards the plasma edge, which is compatible with that of electron heat diffusivity);
a strong correlation between the measured magnetic turbulence and the local temperature gradient is observed during the additional heating;
a local electron heat diffusivity induced by magnetic fluctuations is estimated using the non-collisional quasi-linear formula. a.

Additional information

Authors: COLAS L ET AL, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);GRÉSILLON D, École Polytechnique, Laboratoire PMI, Palaiseau (FR);GRESILLON D, Ecole Polytechnique, Laboratoire PMI, Palaiseau (FR)
Bibliographic Reference: Report: EUR-CEA-FC-1594 EN (1997) 25pp.
Availability: Available from Association Euratom-CEA, CEN Cadarache, 13108 Saint-Paul-lez Durance (FR)
Record Number: 199710423 / Last updated on: 1997-04-23
Original language: en
Available languages: en