Community Research and Development Information Service - CORDIS

Abstract

For the plasma parameters considered here, one may conclude that vanadium 21+ ions absorb directly a fraction of the RF power via ion Landau damping. Furthermore at the second harmonic of V**21+ ions, the net heating effect is not to sustain a fast vanadium ion tail and that the energy transported by the accelerated ions is redistributed among deuteron ions. It then results that at the onset of RF power the slope of T-D (t) must be increased and thus, the RF efficiency. In ICRF experiments it is then crucial to consider the heavy impurity content of a Tokamak discharge in order to evaluate the RF efficiency on to the ions. This can be done: (i) determining the location of the second harmonic layer of a Z/A impurity, (ii) computing the density if the impurity and checking that the k-perpendicular - topology is not changed, (iii) considering the state of ionisation of impurities that are located on the high field side of the hybrid layer, (iv) determining the maximum power that may be absorbed by the impurity, (v) simulating the amount of power coupled on the bulk ions due to the presence in the discharge of heavy impurities.

Additional information

Authors: TFR GROUP, CEA, FONTENAY-AUX-ROSES (FRANCE);GAMBIER D J CEA, FONTENAY-AUX-ROSES (FRANCE), CEA, FONTENAY-AUX-ROSES (FRANCE)
Bibliographic Reference: COURSE AND WORKSHOP ON APPLICATIONS OF RF WAVES TO TOKAMAK PLASMAS, VILLA MONASTERO, VARENNA (ITALY), SEPT. 5-14, 1985 PP. 722-739, VOL. II 908 P., 1985, VOL. I AND VOL. II WRITE TO MONOTYPIA FRANCHI, VIALE UMBRIA 28/C, 06012 CITTA DI CASTELLO, PERUGIA (I
Record Number: 1989124098900 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
Follow us on: RSS Facebook Twitter YouTube Managed by the EU Publications Office Top