Analysis of high frequency Alfven eigenmodes observed in ASDEX Upgrade plasmas in the presence of RF-accelerated NBI ions

Authors :: Ochoukov, R.
Sipila, S.
Bilato, R.
Bobkov, V.
Dreval, M.
Weiland, M.
Dendy, R.
Faugel, H.
Jonsson, Thomas
Kappatou, A.
Kazakov, Y.
McClements, K. G.
Moseev, D.
Salewski, M.
Schneider, P.
Ochoukov, R.
Sipila, S.
Bilato, R.
Bobkov, V.
Dreval, M.
Weiland, M.
Dendy, R.
Faugel, H.
Jonsson, Thomas
Kappatou, A.
Kazakov, Y.
McClements, K. G.
Moseev, D.
Salewski, M.
Schneider, P.
Publication Year :: 2023
Abstract: High frequency Alfven eigenmodes in the ion cyclotron frequency range are actively researched on the ASDEX Upgrade tokamak (AUG). The general properties of this particular mode type are: (a) the mode is beam-driven and, if excited, can persist for the entire duration of the beam-on time window; (b) the mode is sub-cyclotron with the frequency omega similar to 0.5 omega (ci), where omega(ci) corresponds to the on-axis cyclotron frequency of the beam ions<br />QC 20230317

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