Open AccessInfluence of radial electric field on Alfven-type instabilities
Author(s) -
T.S. Hahm,
W. M. Tang
Publication year - 1994
Language(s) - English
Resource type - Reports
DOI - 10.2172/142539
Subject(s) - physics , tokamak , electric field , instability , beta (programming language) , magnetic field , plasma instability , plasma , flux (metallurgy) , ion , atomic physics , computational physics , mechanics , quantum mechanics , materials science , computer science , metallurgy , programming language
The influence of the large scale radial electric field, E{sub r}{sup (0)} on the frequency of shear-Alfven-type instability is analyzed. A frozen-in-flux constraint and the moderate-{beta} ion gyrokinetic equation are used in the derivation. The analysis indicates that the frequency predicted by a theory with E{sub r}{sup (0)} effect should be Doppler-shifted by k {center_dot} V{sub E} 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 tokamak experiment