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- W2189112270 abstract "Fast-particle-driven MHD instabilities such as the fishbone (FB) mode and toroidicityinduced Alfven eigenmodes (TAEs) are one of key physics issues in magnet ically confined fusion plasma experiments because those instabilities may lead to anom alous transport of alphas in a future burning plasma. In existing toroidal devices, experiments concerned with this subject have been so far performed by use of beam ions, perpendicular fast ion produced by ICRH and alphas born from D-T reactions. It should be pointed out that compared with alphas in ITER, in existing experiments, those ions mentioned above are fairly energetic, having much higher ratio of Larmor radius to minor radius and also showing s ignificant shift of banana orbits from flux surfaces [1]. Supra-thermal electrons are also capable of destabilizing those modes since excitation of those modes depends on precessional drift frequency of particle, not on mass [2]. They are characterized by s mall dimensionless orbit, similarly to alphas in reactor-relevant plasmas. In this point of view, it could be mentioned that instabilities driven by supra-thermal electrons are relevant to alpha-particle-driven modes in burning plasmas. After the FB mode excited by supra-thermal electrons produced by 2 nd harmonic ECRH was first found in the DIII-D [3] and Compass-D [4], FB modes associated with supra-thermal electrons have been observed in several tokamaks [5,6]. In regard to helical system, global AEs were excited due to supra-thermal electrons in the weak magnetic shear stellarator HSX with 2 nd harmonic ECRH [7]. In this paper, we report bursting MHD" @default.
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- W2189112270 date "2008-01-01" @default.
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- W2189112270 title "Energetic-particle modes driven by supra-thermal electrons in second harmonic ECRH plasmas of the Compact Helical System" @default.
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