ANOMALOUS TRANSPORT AND UNSTABLE MODES IN NEUTRAL BEAM HEATED L AND H PLASMAS OF ASDEX
It is attempted to determine the type of instabilities responsible for anomalous transport in the L and H regimes. Resistive and ideal ballooning as well as pressure driven modes are found to be stable. There is seen no clear correlation between the electron heat diffusivity in L discharges and the extent of the banana zone. With upsilon-*e < 1 and upsilon-*i < 1 dissipative trapped electron and trapped ion modes should be the dominant drift instabilities in L and H discharges. The time evolution of eta-e, i = dlnT-e, i/dlnn is shown to be correlated with L and H transport. The operational limits of the H regime are found to be connected with variations of eta-e,i, which primarily result from changing the heating profile of injection and the beam fuelling.
Bibliographic Reference: WRITE TO MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, 8046 GARCHING BEI MUENCHEN (GERMANY) MENTIONING REPORT IPP III/100, 1985
Record Number: 1989123074500 / Last updated on: 1987-01-01
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