Effects of a toroidal rotation on the stability boundary of the MHD modes in the tokamak edge pedestal

Aiba, Nobuyuki; Tokuda, Shinji; Furukawa, Masaru*; Oyama, Naoyuki; Ozeki, Takahisa

Effects of a toroidal rotation are investigated numerically on the stability of the MHD modes in the edge pedestal, which relate to the type-I edge-localized mode (ELM). A new linear MHD stability code MINERVA is developed for solving the Frieman-Rotenberg equation, which is the linear ideal MHD equation with flow. As the result of the stability analysis, it is revealed that the sheared toroidal rotation destabilizes the edge localized MHD modes. The change of the safety factor profile affects this destabilizing effect. This is because the rotation effect on the edge MHD stability becomes stronger as the toroidal mode number of the unstable MHD mode increases, and this toroidal mode number strongly depends on the safety factor profile.

Language	:	English
Journal	:	Proceedings of 22nd IAEA Fusion Energy Conference (FEC 2008) (CD-ROM)
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Pages	:	8 Pages
Publication Year/Month	:	2008/10
Meeting title	:	22nd IAEA Fusion Energy Conference (FEC 2008)
Held date	:	2008/10
Location (city)	:	Geneva
Location (country)	:	Switzerland
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Keywords	:	no keyword
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Registration No. : BB20082358
JAEA Abstracts No. : 47001658
Paper Submission No. : 22267

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