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Abstract

This study presents a novel theory for the L-H transition in tokamaks which shows that non-ideal instabilities do occur, with thresholds well below those of the ideal KH modes. At least one of these instabilities is non-linearly unstable as it spins up the rotation, and heats the plasma. The associated turbulence acts as a thermal barrier. The instability threshold can thus be viewed as the onset condition for the L-H transition, with a timescale of the order of 1.0 x E-6 to E-3 sec. A relation is established between the instability threshold and the power threshold.

Additional information

Authors: ROGISTER A, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE);HASSELBERG G, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE);LI D, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE);KHALIL S M, Institut für Plasmaphysik, Kernforschungsanlage Jülich GmbH, Jülich (DE)
Bibliographic Reference: Article: Contributions to the 3rd JET Workshop on H-mode Physics, Vol. 2 (1991) pp. 619-638
Record Number: 199210254 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en