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Excitation of geodesic acoustic mode continuum by drift wave turbulence

  • JUN YU (a1), J. Q. DONG (a2) (a3), X. X. LI (a4), D. DU (a1) and X. Y. GONG (a4)...


Excitation of the geodesic acoustic mode continuum by drift wave turbulence is studied using the wave kinetic approach. For a model profile of weak non-uniform ion temperature, the forms of growth rate and radial structure of geodesic acoustic modes are obtained analytically. The growth rate is analyzed for several conditions for present-day tokamaks and compared with that for uniform ion temperature, as well as that given by the coherent mode approach for non-uniform ion temperature.



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