Ideal and resistive MHD stability of internal kink modes in circular and shaped tokamaks
Recent results for the MHD stability of internal kink modes in tokamaks are reviewed. In general, ideal stability is more restrictive than the conventionally cited limit beta(p) less than 0.3 (where beta(p) is the poloidal beta at the q = 1 surface). This holds, in particular, for shaped equilibria, where low shear in combination with elliptic shaping can reduce the pressure limit drastically. Also in resistive MHD, interchange effects are frequently destabilising, and resistive stability at beta(p) greater than or equal to 0.05 is achieved, for circular cross-section, only with a very restricted class of current profiles, and not at all for JET-shaped cross-section.
Bibliographic Reference: Article: Theory of Fusion Plasmas - Proceedings of the Joint Varenna-Lausanne International Workshop (1992) pp. 257-270
Record Number: 199310372 / Last updated on: 1994-11-29
Original language: en
Available languages: en