Dynamics of MHD instabilities during current ramp-up as a function of plasma shape in the TCV Tokamak
Magnetohydrodynamic (MHD) instabilities are believed to limit the accessible parameter range in Tokamak experiments and to lead, under certain conditions, to catastrophic events such as disruptions. During the current rise-phase sudden bursts of rotating MHD activity of low mode numbers (m, n) have been frequently observed in several Tokamak, especially with circular cross section. In the "Tokamak Configuration Variable" (TCV) the plasma shaping capabilities are used to avoid such modes and disruptions during current ramp up. The dynamic of the instability leading to the disruption phase will be presented with emphasis on interaction between modes on different resonant surfaces and mode-conducting wall interaction phenomena and their dependency on plasma shape. Comparison with the available theory will be discussed.
Bibliographic Reference: An oral report given at: Jahrestagung in Lausanne Organised by: Swiss Physical Society Held at: Lausanne (CH), 28 February to 1 March 2002
Record Number: 200214452 / Last updated on: 2002-03-08
Original language: en
Available languages: en