Observation of magnetohydrodynamic instabilities in Heliotron J plasmas
Yamamoto, S; Nagasaki, Kazunobu; Suzuki, Y; Mizuuchi, T; Okada, H; Kobayashi, S; Blackwell, Boyd; Kondo, Katsumi; Motojima, G; Nakajima, N; Nakamura, Yuji; Nuhrenberg, C; Torii, Y; Watanabe, S; Sano, F
Two kinds of magnetohydrodynamics instability are observed in electron cyclotron heating and neutral beam injection-heated Heliotron J plasmas. One is the pressure-driven interchange modes with m = 2/n = 1 and m = 5/n = 3 and low frequency (fexp < 20 kHz), which are observed in the plasma with a rational surface of 1/2π= 0.5 or 0.65. The other is the energetic ion-driven global Alfvén eigenmodes (GAEs) in the Alfvén frequency range. To identify the observed GAEs, the frequency of the observed...[Show more]
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