Plasma pressure effect on the multiple low-shear toroidal Alfvén eigenmodes

Marchenko, V. S.
April 2009
Physics of Plasmas;Apr2009, Vol. 16 Issue 4, p044504
Academic Journal
It is shown that there is a critical thermal pressure gradient at which the polarizations of the multiple low-shear toroidal Alfvén eigenmodes (TAEs) are reversed. Below the critical value, the TAE spectrum consists of two bands of the even (odd) modes located in the upper (lower) part of the toroidal Alfvén gap, which is consistent with the zero-pressure limit [J. Candy, B. N. Breizman, J. W. Van Dam, and T. Ozeki, Phys. Lett. A 215, 299 (1996)]. Above the critical pressure, the odd (even) TAEs appear in the upper (lower) part of the gap.


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