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- W2000308259 abstract "The low shear in W7-AS magnetic configurations leads to global Alfvén eigenmodes (GAEs) of both helicities. Thus, low frequency GAEs with the same helicity as toroidal Alfvén eigenmodes (TAEs) and elliptical Alfvén eigenmodes (EAEs) in tokamaks exist in W7-AS; GAEs that are usually forbidden in tokamaks. Observations of diagnostic signals reveal a rich spectrum of neutral beam injection (NBI) driven GAEs in W7-AS in the frequency range 0 ⩽ fGAE ⩽ 500 kHz. These GAEs are excited via sideband resonances with NBI ions at low plasma densities and via fundamental resonances at higher plasma densities. A transition in the mode of excitement occurs when the increasing plasma density brings the central local Alfvén velocity down below the maximum tangential injection velocity of the NBI ions." @default.
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- W2000308259 date "1998-03-01" @default.
- W2000308259 modified "2023-10-09" @default.
- W2000308259 title "Further observations of neutral beam driven global Alfvén eigenmodes in Wendelstein W7-AS" @default.
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- W2000308259 doi "https://doi.org/10.1088/0029-5515/38/3/307" @default.
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