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Southwestern Institute of Physics, P.O.Box 432, Chengdu 610041, P. R. China
Abstract. In this paper, a model of sheared flow stabilization on hybrid
electron-ion drift mode is proposed. At first, in the presence of dissipative
trapped electrons, there exists an intrinsic oscillation mode in tokamak
plasmas, namely hybrid dissipative trapped electron-ion temperature gradient
mode (hereafter, called as hybrid electron-ion drift mode). This conclusion is
in agreement with the observations in the simulated tokamak experiment on the
CLM. Then, it is found that the coupling between the sheared flows and
dissipative trapped electrons is proposed as the stabilization mechanism of
both toroidal sheared flow and poloidal sheared flow on the hybrid
electron-ion drift mode, that is, similar to the stabilizing effect of
poloidal sheared flow on edge plasmas in tokamaks, in the presence of both
dissipative trapped electrons and toroidal sheared flow, large toroidal
sheared flow is always a strong stabilizing effect on the hybrid electron-ion
drift mode in internal transport barrier location, too. This result is
consistent with the experimental observations in JT-60U.
IAEA 2001
