Elongation and current scalings of local global energy transport

Becker, G.

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Elongation and current scalings of local global energy transport

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Becker, G.
Tokamak Theory (TOK), Max Planck Institute for Plasma Physics, Max Planck Society;

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Becker, G. (2002). Elongation and current scalings of local global energy transport. Nuclear Fusion, 42(4), L8-L9.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-4138-8

Abstract

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) proportional to kappa(0.8) is caused by W proportional to n T-0 V with the volume V proportional to kappa and the surface area leading to T-0 proportional to kappa(-0.2). Empirical scalings of the effective heat diffusivity chi with kappa, the current inside a flux surface I (x). B-p and q are presented. Applying I (x) makes chi independent Of kappa, while a formulation with q yields strong implicit and explicit kappa dependences.