Shape and aspect ratio effects on the ideal internal kink mode
The ideal internal kink mode can be the trigger of sawtooth oscillations, therefore it is important to predict its behaviour in different plasma configurations. In numerous theoretical works the analytical formulae for ideal internal kink mode stability conditions and growth rate were obtained for different assumptions on plasma geometry and pressure and current profiles that have limited their validity range. Operating conditions of modern and future tokamaks are often beyond these limitations and therefore numerical codes have to be used to study the behaviour of the internal kink. Using these codes it is possible to analyse the dependence of the internal kink growth rate on some important plasma parameters, to create an approximate scaling of these dependences, to use them for comparison with experimental data and to predict the behaviour of the mode in future experiments. In the present work, we are analysing the dependence of the internal ideal kink mode on inverse aspect ratio, plasma elongation and triangularity is analysed and a scaling is proposed which describes these dependences. The experimental data on behaviour on sawteeth oscillations in TCV experiments and possible further TCV experiments are also discussed.
Bibliographic Reference: A paper presented at the Joint Varenna-Lausanne International Workshop on "Theory of Fusion Plasmas", Varenna, Italy, August 27-30 2002, and published in EPFL Internal report 737/02, October 2002, pp.33-38
Availability: Available free of charge from: École Polytechnique Fédérale de Lausanne (EPFL), Ecublens, CH-1015 Lausanne Fax +41-21-6934747 Available online on the workshop website: http://varenna-lausanne.epfl.ch/
Record Number: 200215543 / Last updated on: 2002-11-20
Original language: en
Available languages: en