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Effect of large magnetic islands on screening of external magnetic perturbation fields at slow plasma flow

L. Li ; Yueqiang Liu (Institutionen för rymd- och geovetenskap, Plasmafysik och fusionsenergi) ; X. Huang ; Q. Luan ; F. C. Zhong
Physics of Plasmas (1070-664X). Vol. 24 (2017), 2,
[Artikel, refereegranskad vetenskaplig]

A toroidal resistive magneto-hydrodynamic plasma response model, involving large magnetic islands, is proposed and numerically investigated, based on local flattening of the equilibrium pressure profile near a rational surface. It is assumed that such islands can be generated near the edge of the tokamak plasma, due to the penetration of the resonant magnetic perturbations, used for the purpose of controlling the edge localized mode. Within this model, it is found that the local flattening of the equilibrium pressure helps to mitigate the toroidal curvature induced screening effect [Glasser et al., Phys. Fluids 7, 875 (1975)]-the so called Glasser-Greene-Johnson screening, when the local toroidal flow near the mode rational surface is very slow (for example, as a result of mode locking associated with the field penetration). The saturation level of the plasma response amplitude is computed, as the plasma rotation frequency approaches zero. The local modification of the plasma resistivity inside the magnetic island is found to also affect the saturation level of the plasma response at vanishing flow.



Denna post skapades 2017-04-19. Senast ändrad 2017-07-07.
CPL Pubid: 248893

 

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Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Plasmafysik och fusionsenergi (2013-2017)

Ämnesområden

Fusion, plasma och rymdfysik

Chalmers infrastruktur