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The work shows the main characteristics of the ion temperature of Alfvèn wave heated plasmas in the TCA tokamak. A neutral particle analyser is used to measure the ion temperature. Details of its operational principles and calibration are explained. In a study of stationary ohmic plasmas, the ion losses are empirically derived, using a naïve model. A study of nonstationary ohmic plasmas shows that the ion temperature is a function of both the density and its time derivative. This dependence must be accounted for when evaluating the ion temperature increase during Alfvèn wave heating, which itself induces a density rise. A detailed comparison between nonstationary ohmic discharges and Alfvèn wave heated plasmas shows that the ion temperature increment cannot be explained by only the density increase. As the density rises, discrete Alfvèn wave resonances appear indicating changes in the excited spectrum. These are often accompanied by an abrupt variation of the measured ion temperature.

Additional information

Authors: DE CHAMBRIER A, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Report: LRP 345/88 FR (1988)
Availability: Available from Confédération Suisse, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, 21 avenue des Bains, 1007 Lausanne (CH)
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