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Sawtooth-free ohmic discharges can serve as a model case for a quiescent tokamak plasma. The properties and global parameters of these discharges observed in ASDEX are reviewed, and comments are made on the mechanism which seems to be responsible for the stabilisation of the sawtooth instability. Stationary ohmic discharges have been used to investigate particle, impurity and energy transport in the absence of the sawtooth instability. Particular emphasis is given to a comparison with the predictions of neoclassical theories. It is found that the ion energy transport is at the level predicted by neoclassical theory, and can explain particle and impurity transport with neoclassical inward drift velocities and diffusion coefficients with the same small anomalous contribution. In the central region of the plasma, where the power flux is low, very small values are found for the electron heat conductivity.

Additional information

Authors: STROTH U ET AL., Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP III/178 EN (1991) 55 pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
Record Number: 199111174 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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