Zonal flow

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In a toroidal confined fusion plasma experiment,zonal flow** Is a term meaning a plasma flow mainly flowing in the magnetic surface in the poloidal direction. From the analogy of the large atmospheric current and "pseudo two dimensional" nature of the ocean current "zonal" which means latitude, the pseudo two - dimensional nature of the low frequency flow in a strongly magnetized plasma similar to it is used for the former It is expressed in terms.

The toroidal flow in the toroidal plasma state is further characterized by these.

• Localized transversely to the magnetic surface with radial extent (as opposed to spherical plasma rotation)
• There is little or no change in poloidal direction or toroidal direction. _ m = n = _ 0 mode (m and n are the number of poloidal mode and toroidal mode respectively)
• It has a real frequency of 0 (as opposed to a geodetic acoustic mode branch with a finite frequency) when analyzed by linearization around a non-perturbed toroidal equilibrium state.
• It occurs through phenomena caused by low frequency drift mode, where energy transitions to longer wavelengths due to modulation instability or inverse cascade.

References

• Diamond, P. H. (2005). "Zonal flows in plasma-a review". Plasma Phys. Control. Fusion 47(5): R 35 - R 161.
• Dewar, RL; Abdullatif, RF (2007). "Zonal flow generation by modulational instability". In Eds. Denier, JP. Frontiers in Turbulence and Coherent Structures - World Scientific Lecture Notes in Complex Systems . 6., and Frederiksen, JS. Singapore: World Scientific. pp. 415-430.:.

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Post Date : 2018-01-28 23:00

This article is taken from the Japanese Wikipedia Zonal flow

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