科研之友
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摘要
A self-consistent theory for the interaction between electron temperature gradient (ETG) and drift-ion temperature gradient (DITG) turbulence is presented. Random shear suppression of ETG turbulence by DITG modes is studied, as well as the back-reaction of the ETG modes on the DITG turbulence via stresses. It is found that ETG dynamics can be sensitive to shearing by short-wavelength DITG modes. DITG modulations of the electron temperature gradient are also shown to be quite significant. Conversely, the back-reaction of the ETG on the DITG turbulence is found to be weak. The importance of different interactions is quantified via scalings which sensitively depend upon the electron-ion mass ratio. The findings are used to motivate a discussion of the development of a "super-grid" model for the effects of DITG turbulence on the ETG turbulence.
- 出版日期2004-3
