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Abstract

Recently an experimental campaign has been launched on TCV with the aim of exploring and extending the limits of the operating space. The vertical position control system has been optimised, with the help of extensive model calculations, in order to allow operation at the lowest possible stability margin. In addition, the growth rate of the axisymmetric instability has been minimized by choosing optimum values for the plasma triangularity and squareness and by operating close to the current limit imposed by the n=1 external kink mode. These measures have allowed us to reach record values of elongation, k=2.8, and normalized current, IN=3.6, in a tokamak with standard aspect ratio, R/a=3.5.

This report has been accepted for publication in Nuclear Fusion. .

Additional information

Authors: HOFMANN F ET AL, Ecole Polytechnique Federale de Lausanne (CH)
Bibliographic Reference: Internal report LRP 717/01, January 2002. pp.24.
Availability: Available free of charge from: Ecole Polytechnique Federale de Lausanne (EPFL), Ecublens, CH-1015 Lausanne Fax +41-21-6934747
ISBN: ISSN: 0458-5895
Record Number: 200214451 / Last updated on: 2002-03-08
Category: PUBLICATION
Original language: en
Available languages: en