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The presence of a magnetic field separatrix influences tokamak stability in the framework of ideal MHD. Full separatrix geometry divertor tokamak plasmas and doublet configurations with internal separatrices have been the subject of intensive numerical studies during the last seven years using the KINX equilibrium and stability code family developed for this purpose.

The finite element formulation used in the KINX code allows for a consistent treatment of the full separatrix geometry, including the case of doublet configurations having two magnetic axes and an internal separatrix. Numerical destabilization elimination and ballooning factor extraction recently specialized to the separatrix case considerably improve the code convergence properties, especially when there are many rational surfaces in plasma. .

Additional information

Authors: MEDVEDEV S. Yu, Keldysh Institute, Russian Academy of Sciences, Moscow (RU);HENDER T.C, Eratom/UKAEA Fusion Association, Culham Science Centre, Abingdon (UK);SAUTER, CRPP, Association Euratom-Confederation Suisse, EPFL, Laussane (CH);VILLARD L, CRPP, Association Euratom-Confederation Suisse, EPFL, Laussane (CH)
Bibliographic Reference: An oral report given at: The 28th EPS Conference of Controlled Fusion and Plasma Physics. Held in: Madeira (PT) June 2001
Record Number: 200013698 / Last updated on: 2001-09-18
Original language: en
Available languages: en
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