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Abstract

One of the principle aims of the TCV tokamak is to produce plasmas with very high elongation. These plasmas are highly unstable with respect to axisymmetric modes and require both active and passive stabilization. The maximum vertical growth rate that can be stabilised is of the order of the inverse of the response time of the power supplies which are used for the active stabilization.

Vertical growth rate calculations have been performed for TCV using the NOVA-W code. In order to validate our theoretical model, we have measured the open-loop vertical growth rate for a variety of TCV plasmas and we compare the results with the model predictions. Single-parameter scans were used to measure the dependence of the growth rate on plasma elongation, triangularity and initial vertical position. Growth rates were measured by opening the vertical (and radial) feedback control loops with fixed coil currents and observing the exponential growth of the vertical displacement via the magnetic and soft X-ray diagnostics. .

Additional information

Authors: DUTCH M J, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches enPhysique des Plasmas (CH);HOFMANN F, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches enPhysique des Plasmas (CH);SAUTER O, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches enPhysique des Plasmas (CH);WARD D J, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches enPhysique des Plasmas (CH);ANTON M, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches enPhysique des Plasmas (CH);MORET J-M, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches enPhysique des Plasmas (CH)
Bibliographic Reference: Article: Proceedings of the 22nd European Physical Society Conference on Controlled Fusion and Plasma Physics, Vol. 19C (1995) Part IV, pp. 77-80
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