| Autor: |
Marchenko, V. S., Reznik, S. N. |
| Předmět: |
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| Zdroj: |
Physics of Plasmas; Jul2021, Vol. 28 Issue 7, p1-6, 6p |
| Abstrakt: |
In the so-called "hybrid" shots characterized by shear-free core with safety factor slightly above 1, an interesting yet unexplained chirping activity has been observed in tokamaks with a high fast ion content. Namely, fishbone modes with m = n = 1 and downward frequency chirping are accompanied by frequency jumps of the tearing modes with m = n + 1 and n > 1 [here m(n) is the poloidal (toroidal) mode number]. In the present work, these related phenomena are attributed to a combination of the two impulsive toroidal torques: (1) recoil torque applied to the shear-free core during fishbone burst and (2) electromagnetic torque applied to the tearing layer. We have developed a quasi-linear model in which fast transients of the plasma toroidal rotation induced by these torques qualitatively reproduce the observed chirping dynamics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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