Ion scale nonlinear interaction triggered by disparate scale electron temperature gradient mode

Chanho Moon, Tatsuya Kobayashi, Kimitaka Itoh, Rikizo Hatakeyama, Toshiro Kaneko

研究成果: Contribution to journalArticle査読

抄録

We have observed that the disparate scale nonlinear interactions between the high-frequency (∼0.4 MHz) electron temperature gradient (ETG) mode and the ion-scale low-frequency fluctuations (∼kHz) were enhanced when the amplitude of the ETG mode exceeded a certain threshold. The dynamics of nonlinear coupling between the ETG mode and the drift wave (DW) mode has already been reported [C. Moon, T. Kaneko, and R. Hatakeyama, Phys. Rev. Lett. (2013)]. Here, we have newly observed that another low-frequency fluctuation with f ≃ 3.6 kHz, i.e., the flute mode, was enhanced, corresponding to the saturation of the DW mode growth. Specifically, the bicoherence between the flute mode and the DW mode reaches a significant level when the ∇Te/Te strength exceeded 0.54 cm-1. Thus, it is shown that the ETG mode energy was transferred to the DW mode, and then the energy was ultimately transferred to the flute mode, which was triggered by the disparate scale nonlinear interactions between the ETG and ion-scale low-frequency modes.

本文言語英語
論文番号052301
ジャーナルPhysics of Plasmas
22
5
DOI
出版ステータス出版済み - 5 1 2015
外部発表はい

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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