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Abstract

The application of Alfv'en Wave Heating (AWH), is accompanied by an electron density (n-e) rise and an increase in the ion temperature, (T-i), measured with a Neutral Particle Analyser (NPA). A study was performed and a formula developed to model the T-i in non stationary ohmic discharges, to determine if the T-i increase is simply due to n-e. When compared with AWH discharges, the observed T-i is consistently higher than predicted by the ohmic model, indicating an additional source due to the RF. T-i also reflected the evolution of the AW spectra and reaches a maximum at the onset of a new continuum ie: when the resonant surfaces are in the outer half of the minor radius. T-i was investigated with modulated RF power, and a modulated gas puff, measuring the phase and amplitudes of the T-i rise relative to the perturbation. We conclude that the RF appears to have a direct effect on the T-i.

Additional information

Authors: DE CHAMBRIER A, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);DUVAL B P, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);LISTER J B, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);MOMPEAN F J, CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND);MORET J M CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND), CENTRE DE RECHERCHES EN PHYSIQUE DES PLASMAS, ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (SWITZERLAND)
Bibliographic Reference: 15TH EUROPEAN CONFERENCE ON CONTROLLED FUSION AND PLASMA HEATING, DUBROVNIK (YUGOSLAVIA), MAY, 16-20, 1988, AVAILABILITY: CEC-LUXEMBOURG, DG-XIII-C-3, POB 1907, MENTIONING PAPER EN 34072 ORA
Availability: Can be ordered online
Record Number: 1989126118900 / Last updated on: 1989-06-01
Category: PUBLICATION
Available languages: en