Abstract
The influence of the large-scale radial electric field, E(0)r on the frequency of shear-Alfvén-type instability is analyzed. A frozen-in-flux constraint and the moderate-β ion gyrokinetic equation are used in the derivation. The present analysis indicates that the frequency predicted by a theory without E(0)r effect should be Doppler shifted by k⋅VE for comparison to the experimentally observed frequency. A specific example of the practical relevance of the result is given regarding possible identification of the edge-localized-mode-associated magnetic activity recently observed in PBX-M [Plasma Physics and Controlled Nuclear Fusion Research (International Atomic Energy Agency, Vienna, 1989), Vol. 1, p. 97] tokamak experiment.
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