Speaker
Huishan Cai
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P5.1035.pdf
Influence of toroidal rotation on magnetic islands in tokamaks
Huishan Cai1, Jintao Cao2
1
University of Science and Technology of China, Hefei, China
2
Institute of Physics, Beijing, China
The dynamics of magnetic islands including toroidal rotation in tokamaks is studied. It is
found that the contribution of toroidal rotation to the dynamics of magnetic islands is
mainly through the coupling of magnetic curvature with pressure and density. In the
presence of toroidal rotation, pressure and density are poloidal asymmetric. Then, their
coupling with magnetic curvature provides a perpendicular current, and a corresponding
return parallel current is induced to affect the dynamics of magnetic islands. It is found
that the effect of toroidal rotation depends on its magnitude, rather than the shear. It also
depends on the relative magnitude of the island propagation frequency to sound
frequency. When the Mach number is large enough, the effect of toroidal rotation is
stabilizing and dramatic, and overcomes the contribution of polarization current, namely
the onset threshold of NTMs increases. Further, it is also suggested that the toroidal
rotation plays an important role in the stability of small scale magnetic islands.
References:
(1) Huishan Cai, Jintao Cao, "Influence of toroidal rotation on tearing modes", Nucl. Fusion 57,
056006(2017)
(2)Huishan Cai, Jintao Cao, "Influence of toroidal rotation on magnetic islands in tokamaks",
Nucl. Fusion 58, 036008(2018)
