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This paper highlights some topics of specific concern for both concepts for magnetic confinement: 2D (tokamaks) and 3D (helical) systems. Section 2 addresses the primary goals of fusion: density, confinement and temperature. The paper summarizes the density limit, the global confinement time scaling with engineering parameters and some physical elements of improved confinement regimes with edge (H-mode) and core transport barriers (reversed shear cases); progress in relation to temperature originates from the evidence for alpha-particle heating from Tokamak fusion test reactor (TFTR) and the successes in drift optimization in helical systems with some confirmation from W7-AS. In the section 3 on the secondary goals of fusion, beta will be discussed in terms of equilibrium and in terms of stability (including fast particle-driven Alfvén waves with toroidally induced eigenmodes in cases with high shear and global eigenmodes in cases with low shear). Finally, the status of exhaust physics is discussed, with reference to the poloidal field divertor in tokamaks and the island divertor in helical systems.

Additional information

Authors: WAGNER F, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion, Vol. 39 (1997) pp. A23-A50
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