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Spectrograph of electric field fluctuation in toroidal helical plasma

  • Author(s): Fujisawa, A
  • Itoh, K
  • Shimizu, A
  • Nakano, H
  • Ohsima, S
  • Iguchi, H
  • Matsuoka, K
  • Okamura, S
  • Itoh, SI
  • Diamond, PH
  • et al.

This is a report on fluctuation measurements using twin heavy ion beam probes in CHS. The observation shows that dozens of coherent modes with intermittent nature co-exist in an electron cyclotron heated plasma. The modes are found to have a long-distance correlation in the toroidal direction. The radial structure of the modes is evaluated in potential fluctuation. The characteristics are consistent with those of the geodesic acoustic modes. © 2006 IOP Publishing Ltd.

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