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Coherent structures and their stability in ion temperature gradient turbulence

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1 Author(s)
Dastgeer, S. ; Transp. Theor. Group, Chalmers Univ. of Technol., Goteborg, Sweden

Periodic arrays of large scale coherent vortices and their stability have been investigated, within the framework of ηi turbulence, using two-dimensional fluid simulation in slab geometry. These vortices, in combination with viscosity damping of small scales, contribute to the formation of a steady state in a system with linearly unstable modes. The steady state comprises of a few vortex convective turn over times and seems to be fairly robust. It has been recognized that a vortex chain, consisting of positive and negative vorticities, continues to move stably in the poloidal direction (along periodic direction). On the other hand, an initial isolated monopole vortex is unstable and leads to a long-lived stable dipolar structure after a few vortex turnover periods. A variety of simple collisional interaction processes among these coherent vortices have also been explored numerically.

Published in:

Plasma Science, IEEE Transactions on  (Volume:31 ,  Issue: 2 )

Date of Publication:

April 2003

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