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The scaling of local and global energy confinement with elongation kappa and current in L- and H-mode plasmas is explored. It is shown that the elongation enters global confinement only through the geometrical quantities of plasma volume and surface area, while local transport does not contribute. The global scaling [tau(E) alpha kappa {0.8}] is caused by [W alpha nT(0)V] with the volume [V alpha kappa] and the surface area leading to [T(0) alpha kappa {-0.2}]. Empirical scalings of the effective heat diffusivity chi with kappa, the current inside a flux surface I(x), Bp and q are presented. Applying I(x) makes chi independent of kappa, while a formulation with q yields strong implicit and explicit kappa dependences.

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Authors: BECKER G, Max-Planck-Institut für Plasmaphysik, EURATOM Association, Garching (DE)
Bibliographic Reference: A letter published in: Nuclear Fusion, 42, (April 2002), pp. L8-L9.
Availability: The full text of this letter is available online at:
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