Ideal-MHD operational limits for highly elongated tokamaks
The aim of this ideal MHD stability study is to clarify the operational limits imposed by vertical, kink and ballooning stability for tokamaks with elongation from 2 to 3. It is found that the beta limit of highly elongated tokamaks increases with triangularity. As a function of elongation, the limit shows a maximum for k values close to 2.5. The n = 1 and ballooning limits fall weakly at higher elongation. However, vertical stability for high elongation requires operation at low inductance and this causes a more significant decrease of the n = 1 beta limit. At high elongation, the beta limit is set entirely by n = 0 and n = 1 stability. Finite pressure is clearly favourable for vertical stability at high elongation.
Bibliographic Reference: Paper presented: 19th EPS Conference on Controlled Fusion and Plasma Physics, Innsbruck (AT), June 29 - July 3, 1992
Availability: Available from (1) as Paper EN 36864 ORA
Record Number: 199210700 / Last updated on: 1994-12-02
Original language: en
Available languages: en