Influence of triangularity and pressure profiles on ideal-MHD beta limits
Tokamaks with shaped, rather than circular, cross-sections allow significantly higher plasma current and beta. Ideal MHD stability calculations are carried out for free boundary kink, ballooning and Mercier modes to study the dependence of the beta limit on triangularity, peaking of the pressure profile and plasma current. It is found that strong central pressure gradients are confined by significantly less peaked current profiles at high triangularity than for an ellipse. Also, although the limit in volume average beta falls a little for peaked pressure, these profiles appear advantageous for reaching ignition.
Bibliographic Reference: Paper presented: 13th International Conference on Plasma Physics and Controlled Nuclear Fusion Research, Washington D.C. (US), Oct. 1-6, 1990
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Record Number: 199011569 / Last updated on: 1994-12-02
Original language: en
Available languages: en