24th IAEA Fusion Energy Conference - IAEA CN-197

EX/5-2: Studies of Energetic-ion-driven MHD Instabilities in Helical Plasmas with Low Magnetic Shear

11 Oct 2012, 14:00

4h 45m

Poster Room (Area F-B)

Poster Poster: P6

Speaker

Mr Satoshi Yamamoto (Japan)

Description

We discuss the features of energetic-ion-driven MHD instabilities such as Alfvén eigenmodes (AEs) in three-dimensional magnetic configuration with low magnetic shear and low toroidal field period number (Np) that are characteristic of advanced helical plasmas. Comparison of experimental and numerical studies in Heliotron J with those in TJ-II indicates that the most unstable AE is global AE (GAE) in the low rotational transform (iota) configuration and helicity-induced AE (HAE) in the high iota configuration.

Country or International Organization of Primary Author

Japan