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Abstract

The stability of the vertical position control system in TCV is analysed using two different plasma models, a deformable plasma model and a rigid plasma model. Open loop growth rates and closed loop stability are computed, as a function of plasma elongation and triangularity, for both models. It is found that, for highly elongated and D-shaped plasmas, the rigid plasma model grossly overestimates closed loop stability although the open loop growth rates of the two models are similar. The stable domains in gain space, as predicted by the two models, are compared with experimental observations obtained from a highly elongated, D-shaped plasma in TCV (kappa=2.55).

Additional information

Authors: HOFMANN F, Centre de Recherches en Physique des Plasmas, Association EURATOM - Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);MORET J M, Centre de Recherches en Physique des Plasmas, Association EURATOM - Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH);WARD D J, Centre de Recherches en Physique des Plasmas, Association EURATOM - Confédération Suisse, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Article: Nuclear Fusion
Record Number: 199810666 / Last updated on: 1998-05-26
Category: PUBLICATION
Original language: en
Available languages: en