Full Paper
Contents  Return  Previous Page  Next Page  Index


Return To: Session THP2 - Theory 2 (Transport)
Prev Page: (THP2/31) Improvement of MHD Stability in Negative/Weak Shear
Next Page: (THP2/33) Instability Threshold of Neoclassical Tearing Mode, Double


(THP2/32) Flow Shear Stabilization of Hybrid Electron-Ion Drift Mode in Tokamaks

L. Bai

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.

Read the full paper in PDF format.


IAEA 2001