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Author(s):
H. Iguchi, T.P. Crowley, A. Fujisawa, S. Lee, K. Tanaka, T. Minami, S. Nishimura, K. Ida, R. Akiyama, Y. Hamada, H., Idei. M. Isobe, M. Kojima, S. Kubo, S. Morita, S. Ohdachi, S. Okamura, M. Osakabe, K. Matsuoka, C. Takahashi and K. Toi
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Title:
Space Potential Fluctuations during MHD Activities in the Compact Helical System (CHS)
Date of publication:
Feb. 1998
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Key words:
Space Potential, Fluctuation, MHD Activity, Heavy lon Beam Probe, CHS, Interchange Instability
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Abstract:
Local space potential fluctuations have been measured during MHD activities in a low-beta NBI heated plasma in the Compact Helical System (CHS) by the use of a heavy ion beam probe (HIBP). Two types of MHD modes with accompanying potential oscillations are observed. One appears in periodic bursts with relatively low frequency (< 40 kHz) and large amplitude (20 - 40 volts), and is localized around the q = 2 surface (average minor radius rho ~ 0.7). The other appears in continuous and coherent oscillation with higher frequency (105 - 125 kHz) and smaller amplitude (~ 5 volts). This oscillation also has spatial structure. Possible interpretation for the space potential oscillations is presented.
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