Response of a core coherent density oscillation on electron cyclotron resonance heating in Heliotron J plasma

• Kobayashi, Tatsuya

• Kobayashi, S.

• Lu, X. X.

• Kenmochi, Naoki

• IDA, Katsumi

• Ohshima, Shinsuke

• Yamamoto, S.

• KADO, Shinichiro

• Kokubo, D.

• NAGASAKI, Kazunobu

• Okada, H.

• MINAMI, Takashi

• Otani, Y.

• MIZUUCHI, Tohru

抄録

0000-0001-5669-1937

We report properties of a coherent density oscillation observed in the core region and its response to electron cyclotron resonance heating (ECH) in Heliotron J plasma. The measurement was performed using a multi-channel beam emission spectroscopy system. The density oscillation is observed in a radial region between the core and the half radius. The poloidal mode number is found to be 1 (or 2). By modulating the ECH power with 100 Hz, repetition of formation and deformation of a strong electron temperature gradient, which is likely ascribed to be an electron internal transport barrier, is realized. Amplitude and rotation frequency of the coherent density oscillation sitting at the strong electron temperature gradient location are modulated by the ECH, while the poloidal mode structure remains almost unchanged. The change in the rotation velocity in the laboratory frame is derived. Assuming that the change of the rotation velocity is given by the background E × B velocity, a possible time evolution of the radial electric field was deduced.

収録刊行物

• Physics of Plasmas

  Physics of Plasmas 25 012513-, 2018-01-29

  AIP Publishing

キーワード

• Condensed Matter Physics

詳細情報

• CRID: 1050008998069564032
• NII論文ID: 120007176993
• NII書誌ID: AA10987555
• ISSN: 1070664X
• ISSN: 10897674
• DOI: 10.1063/1.5007903
• HANDLE: 10655/00012734
• Web Site: https://nifs-repository.repo.nii.ac.jp/records/10756
• Web Site: https://pubs.aip.org/aip/pop/article-pdf/doi/10.1063/1.5007903/14744329/012513_1_online.pdf
• 本文言語コード: en
• 資料種別: journal article
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