Potential fluctuation associated with the energetic-particle-induced geodesic acoustic mode in the Large Helical Device

T. Ido; A. Shimizu; M. Nishiura; S. Nakamura; S. Kato; H. Nakano; Y. Yoshimura; K. Toi; K. Ida; M. Yoshinuma; S. Satake; F. Watanabe; S. Morita; M. Goto; K. Itoh; S. Kubo; T. Shimozuma; H. Igami; H. Takahashi; I. Yamada; K. Narihara

doi:10.1088/0029-5515/51/7/073046

Potential fluctuation associated with the energetic-particle-induced geodesic acoustic mode in the Large Helical Device

T. Ido, A. Shimizu, M. Nishiura, S. Nakamura, S. Kato, H. Nakano, Y. Yoshimura, K. Toi, K. Ida, M. Yoshinuma, S. Satake, F. Watanabe, S. Morita, M. Goto, K. Itoh, S. Kubo, T. Shimozuma, H. Igami, H. Takahashi, I. YamadaK. Narihara

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

Geodesic acoustic modes (GAM) driven by energetic particles are observed in the Large Helical Device (LHD) by a heavy ion beam probe. The GAM localizes near the magnetic axis. It is confirmed that the energetic-particle-induced GAM is accompanied by an electrostatic potential fluctuation and radial electric field fluctuation. The amplitude of the potential fluctuation is several hundred volts, and it is much larger than the potential fluctuation associated with turbulence-induced GAMs observed in the edge region in tokamak plasmas. The energetic-particle-induced GAM modulates the amplitude of the density fluctuation in a high-frequency range. The observed GAM frequency is constant at the predicted GAM frequency in plasmas with reversed magnetic shear. On the other hand, it shifts upwards from the predicted GAM frequency in plasmas with monotonic magnetic shear.

Original language	English
Article number	073046
Journal	Nuclear Fusion
Volume	51
Issue number	7
DOIs	https://doi.org/10.1088/0029-5515/51/7/073046
Publication status	Published - Jul 1 2011
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/0029-5515/51/7/073046

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Ido, T., Shimizu, A., Nishiura, M., Nakamura, S., Kato, S., Nakano, H., Yoshimura, Y., Toi, K., Ida, K., Yoshinuma, M., Satake, S., Watanabe, F., Morita, S., Goto, M., Itoh, K., Kubo, S., Shimozuma, T., Igami, H., Takahashi, H., ... Narihara, K. (2011). Potential fluctuation associated with the energetic-particle-induced geodesic acoustic mode in the Large Helical Device. Nuclear Fusion, 51(7), [073046]. https://doi.org/10.1088/0029-5515/51/7/073046

Ido, T, Shimizu, A, Nishiura, M, Nakamura, S, Kato, S, Nakano, H, Yoshimura, Y, Toi, K, Ida, K, Yoshinuma, M, Satake, S, Watanabe, F, Morita, S, Goto, M, Itoh, K, Kubo, S, Shimozuma, T, Igami, H, Takahashi, H, Yamada, I & Narihara, K 2011, 'Potential fluctuation associated with the energetic-particle-induced geodesic acoustic mode in the Large Helical Device', Nuclear Fusion, vol. 51, no. 7, 073046. https://doi.org/10.1088/0029-5515/51/7/073046

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title = "Potential fluctuation associated with the energetic-particle-induced geodesic acoustic mode in the Large Helical Device",

abstract = "Geodesic acoustic modes (GAM) driven by energetic particles are observed in the Large Helical Device (LHD) by a heavy ion beam probe. The GAM localizes near the magnetic axis. It is confirmed that the energetic-particle-induced GAM is accompanied by an electrostatic potential fluctuation and radial electric field fluctuation. The amplitude of the potential fluctuation is several hundred volts, and it is much larger than the potential fluctuation associated with turbulence-induced GAMs observed in the edge region in tokamak plasmas. The energetic-particle-induced GAM modulates the amplitude of the density fluctuation in a high-frequency range. The observed GAM frequency is constant at the predicted GAM frequency in plasmas with reversed magnetic shear. On the other hand, it shifts upwards from the predicted GAM frequency in plasmas with monotonic magnetic shear.",

author = "T. Ido and A. Shimizu and M. Nishiura and S. Nakamura and S. Kato and H. Nakano and Y. Yoshimura and K. Toi and K. Ida and M. Yoshinuma and S. Satake and F. Watanabe and S. Morita and M. Goto and K. Itoh and S. Kubo and T. Shimozuma and H. Igami and H. Takahashi and I. Yamada and K. Narihara",

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doi = "10.1088/0029-5515/51/7/073046",

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AU - Ido, T.

AU - Shimizu, A.

AU - Nishiura, M.

AU - Nakamura, S.

AU - Kato, S.

AU - Nakano, H.

AU - Yoshimura, Y.

AU - Toi, K.

AU - Ida, K.

AU - Yoshinuma, M.

AU - Satake, S.

AU - Watanabe, F.

AU - Morita, S.

AU - Goto, M.

AU - Itoh, K.

AU - Kubo, S.

AU - Shimozuma, T.

AU - Igami, H.

AU - Takahashi, H.

AU - Yamada, I.

AU - Narihara, K.

PY - 2011/7/1

Y1 - 2011/7/1

N2 - Geodesic acoustic modes (GAM) driven by energetic particles are observed in the Large Helical Device (LHD) by a heavy ion beam probe. The GAM localizes near the magnetic axis. It is confirmed that the energetic-particle-induced GAM is accompanied by an electrostatic potential fluctuation and radial electric field fluctuation. The amplitude of the potential fluctuation is several hundred volts, and it is much larger than the potential fluctuation associated with turbulence-induced GAMs observed in the edge region in tokamak plasmas. The energetic-particle-induced GAM modulates the amplitude of the density fluctuation in a high-frequency range. The observed GAM frequency is constant at the predicted GAM frequency in plasmas with reversed magnetic shear. On the other hand, it shifts upwards from the predicted GAM frequency in plasmas with monotonic magnetic shear.

AB - Geodesic acoustic modes (GAM) driven by energetic particles are observed in the Large Helical Device (LHD) by a heavy ion beam probe. The GAM localizes near the magnetic axis. It is confirmed that the energetic-particle-induced GAM is accompanied by an electrostatic potential fluctuation and radial electric field fluctuation. The amplitude of the potential fluctuation is several hundred volts, and it is much larger than the potential fluctuation associated with turbulence-induced GAMs observed in the edge region in tokamak plasmas. The energetic-particle-induced GAM modulates the amplitude of the density fluctuation in a high-frequency range. The observed GAM frequency is constant at the predicted GAM frequency in plasmas with reversed magnetic shear. On the other hand, it shifts upwards from the predicted GAM frequency in plasmas with monotonic magnetic shear.

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Potential fluctuation associated with the energetic-particle-induced geodesic acoustic mode in the Large Helical Device

Abstract

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