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Abstract

The effect of a divertor on the ideal MHD stability of a quasi-circular single-null tokamak is investigated. Five different poloidal positions of the X-point are studied (inside and outside the torus, on the top of the section and two intermediate positions), and compared to an equivalent reference circular case. For low beta plasmas, the current limit imposed by the n=1 kink is computed. The stable operating window in the (q(o), q(cyl)) plane is also determined. The lower bound on q(cyl) is found to be approx. 1.2 for the divertor configuration. The beta-limit at different values of the total current is considered. The maximum value of beta set by the n=l mode is comparable for each configuration, except when the X-point points upwards, in which case the maximum is roughly doubled. The results of the ballooning optimisation are also presented for the five divertor configurations and for the reference circular case.

Additional information

Authors: ROY A, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Lausanne (CH);TROYON F, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Lausanne (CH)
Bibliographic Reference: Paper presented: 17th EPS Conference on Controlled Fusion and Plasma Heating, Amsterdam (NL), June 25-29, 1990
Availability: Available from (1) as Paper EN 35304 ORA
Record Number: 199011544 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en