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Abstract

The results of analysing the electron temperature response inferred from soft X-ray emissivity, during the modification of the plasma density due to either gas puffing, laser impurity ablation or Alfvèn wave heating are used to investigate energy transport mechanisms in the TCA tokamak. Topics discussed include the dynamic response of the electron temperature, variation of the current profile and influence on the sawtooth parameters. To explain the observed dynamic response of the electron temperature, an apparent thermal energy source localised near the q=1 surface is required, and an abrupt increase of the phase just outside this surface. This energy source could be due to magnetic to thermal energy exchange arising from the observed variation of the current distribution. The large phase jumps could be attributed to a thermal insulation barrier associated with the q=1 surface also observed during pellet injection in the TFR.

Additional information

Authors: DUDOK DE WIT T, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne (CH);DUVAL B P, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne (CH);JOYE B, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne (CH);LISTER J B, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne (CH);MORET J M, Centre de Recherches en Physique des Plasmas, École Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Paper presented: 16th European Conference on Controlled Fusion and Plasma Physics, Venezia (IT), March 13-17, 1989
Availability: Available from (1) as Paper EN 34436 ORA
Record Number: 198910610 / Last updated on: 1994-12-01
Category: PUBLICATION
Original language: en
Available languages: en