Observation of nonlinear coupling between small-poloidal wave-number potential fluctuations and turbulent potential fluctuations in ohmically heated plasmas in the JFT-2M tokamak

Y. Nagashima; K. Hoshino; A. Ejiri; K. Shinohara; Y. Takase; K. Tsuzuki; K. Uehara; H. Kawashima; H. Ogawa; T. Ido; Y. Kusama; Y. Miura

doi:10.1103/PhysRevLett.95.095002

Observation of nonlinear coupling between small-poloidal wave-number potential fluctuations and turbulent potential fluctuations in ohmically heated plasmas in the JFT-2M tokamak

Y. Nagashima, K. Hoshino, A. Ejiri, K. Shinohara, Y. Takase, K. Tsuzuki, K. Uehara, H. Kawashima, H. Ogawa, T. Ido, Y. Kusama, Y. Miura

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123 Citations (Scopus)

Abstract

Two types of electrostatic modes with small-poloidal wave numbers (∼1 and 10-15kHz) are observed in the edge region of Ohmically heated plasmas in the JFT-2M tokamak. The envelope of the higher frequency coherent mode is modulated at the frequency of the lower frequency mode. A bispectral analysis revealed that a significant nonlinear coupling among the two types of fluctuations and the broadband background turbulent potential fluctuations occurs inside the last closed magnetic flux surface, suggesting that a nonlinear process such as the parametric-modulational instability is involved.

Original language	English
Article number	095002
Journal	Physical Review Letters
Volume	95
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.95.095002
Publication status	Published - Aug 26 2005
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.95.095002

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Nagashima, Y., Hoshino, K., Ejiri, A., Shinohara, K., Takase, Y., Tsuzuki, K., Uehara, K., Kawashima, H., Ogawa, H., Ido, T., Kusama, Y., & Miura, Y. (2005). Observation of nonlinear coupling between small-poloidal wave-number potential fluctuations and turbulent potential fluctuations in ohmically heated plasmas in the JFT-2M tokamak. Physical Review Letters, 95(9), [095002]. https://doi.org/10.1103/PhysRevLett.95.095002

Nagashima, Y, Hoshino, K, Ejiri, A, Shinohara, K, Takase, Y, Tsuzuki, K, Uehara, K, Kawashima, H, Ogawa, H, Ido, T, Kusama, Y & Miura, Y 2005, 'Observation of nonlinear coupling between small-poloidal wave-number potential fluctuations and turbulent potential fluctuations in ohmically heated plasmas in the JFT-2M tokamak', Physical Review Letters, vol. 95, no. 9, 095002. https://doi.org/10.1103/PhysRevLett.95.095002

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abstract = "Two types of electrostatic modes with small-poloidal wave numbers (∼1 and 10-15kHz) are observed in the edge region of Ohmically heated plasmas in the JFT-2M tokamak. The envelope of the higher frequency coherent mode is modulated at the frequency of the lower frequency mode. A bispectral analysis revealed that a significant nonlinear coupling among the two types of fluctuations and the broadband background turbulent potential fluctuations occurs inside the last closed magnetic flux surface, suggesting that a nonlinear process such as the parametric-modulational instability is involved.",

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AU - Nagashima, Y.

AU - Hoshino, K.

AU - Ejiri, A.

AU - Shinohara, K.

AU - Takase, Y.

AU - Tsuzuki, K.

AU - Uehara, K.

AU - Kawashima, H.

AU - Ogawa, H.

AU - Ido, T.

AU - Kusama, Y.

AU - Miura, Y.

PY - 2005/8/26

Y1 - 2005/8/26

N2 - Two types of electrostatic modes with small-poloidal wave numbers (∼1 and 10-15kHz) are observed in the edge region of Ohmically heated plasmas in the JFT-2M tokamak. The envelope of the higher frequency coherent mode is modulated at the frequency of the lower frequency mode. A bispectral analysis revealed that a significant nonlinear coupling among the two types of fluctuations and the broadband background turbulent potential fluctuations occurs inside the last closed magnetic flux surface, suggesting that a nonlinear process such as the parametric-modulational instability is involved.

AB - Two types of electrostatic modes with small-poloidal wave numbers (∼1 and 10-15kHz) are observed in the edge region of Ohmically heated plasmas in the JFT-2M tokamak. The envelope of the higher frequency coherent mode is modulated at the frequency of the lower frequency mode. A bispectral analysis revealed that a significant nonlinear coupling among the two types of fluctuations and the broadband background turbulent potential fluctuations occurs inside the last closed magnetic flux surface, suggesting that a nonlinear process such as the parametric-modulational instability is involved.

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Observation of nonlinear coupling between small-poloidal wave-number potential fluctuations and turbulent potential fluctuations in ohmically heated plasmas in the JFT-2M tokamak

Abstract

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