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In the tokamak Tore Supra, when a poloidally and toroidally localized limiter, called a modular limiter, is introduced into the lower part of the scrape-off layer, density fluctuations located in the vicinity of this limiter present a specific feature with the appearance of a new spectral pattern in the associated frequency spectrum. This leads to a strong up-down asymmetry observed in both the plasma edge and the plasma outer core, with a maximum level of turbulence at the bottom of the plasma. The observed asymmetry characteristics show that magnetic connection lengths play critical role here and that the limiter configuration has some effect on the outer core turbulence.

Additional information

Authors: FENZI C ET AL, CEA Centre d'Etudes de Cadarache, St. Paul-lez-Durance (FR);TRUC A ET AL, Laboratoire de Physique des Milieux Ionises, CNRS, Ecole Polytechnique, Palaiseau (FR)
Bibliographic Reference: Article: Nuclear Fusion, vol. 40 (2000), No 9, pp. 1621-1626
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