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The response of the electron temperature profile shape to variations of the electron heating and density profiles is investigated for different confinement regimes. It is shown that the changes in the response exceed the measurement error if the shape of the electron heat diffusivity is kept fixed. The observed constancy of the response profile in the outer half of the plasma is incompatible with such a fixed electron heat diffusivity shape; i.e. an electron temperature profile constraining mechanism must be present. Local transport laws where the electron heat diffusivity varies inversely as the fourth or higher power of the response and the diffusivity varies as the second or higher power of the electron temperature gradient yield the experimentally detected stiffness of the electron temperature profile shape but conflict with empirical electron heat diffusivity scalings. These results support the model of a self-organising and adjusting diffusivity profile causing temperature profile invariance

Additional information

Authors: BECKER G, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Nuclear Fusion, Vol. 32 (1992) No. 6, pp. 1064-1070
Record Number: 199211203 / Last updated on: 1994-11-29
Original language: en
Available languages: en