Optimized start-up of elongated plasmas in the TCV tokamak
TCV is a new tokamak under construction at CRPP, Lausanne. It is designed to produce vertically elongated plasmas of various shapes with values of I(p) up to 1.2 MA and k up to 3. The optimal programming of shape evolution, plasma current and density rampup during the startup phase is a difficult problem. One of the difficulties stems from the fact that, in highly elongated plasmas, axisymmetric stability is favoured by low values of q(s) whereas kink stability requires relatively high values of q(s). Whether the two stability domains can be made to overlap is not at all obvious. In this paper a variety of startup scenarios is considered. It is shown that there are classes of equilibria, with elongation k = 3, which are both kink stable and whose vertical resistive growth rates are low enough to be stabilised by an active feedback system.
Bibliographic Reference: Paper presented: 16th European Conference on Controlled Fusion and Plasma Physics, Venezia (IT), March 13-17, 1989
Availability: Available from (1) as Paper EN 34433 ORA
Record Number: 198910631 / Last updated on: 1994-12-01
Original language: en
Available languages: en