Observation Of Density Fluctuations Originated From RF waves with two-channel reflectometer in GAMMA 10/PDX

Ryo Sekine, Ryuya Ikezoe, Seowon Jang, Mafumi Hirata, Makoto Ichimura, Mizuki Sakamoto, Shuhei Sumida, Koki Izumi, Atsuto Tanaka, Yushi Kubota, Hiroki Kayano, Yousuke Nakashima

研究成果: Contribution to journalArticle査読

抄録

Slow Alfvén wave with a frequency just below an ion cyclotron frequency can be destabilized by the anisotropy of ion temperature and called as Alfvén-Ion-Cyclotron (AIC) wave. In the GAMMA 10/PDX central cell, several AIC waves simultaneously appear in an unstable frequency range. In addition, low-frequency waves with the difference frequencies (DF) between the AIC waves are observed, and their characteristics have to be clarified to reveal their unknown contributions to the ion transport suggested in GAMMA 10/PDX. In this study, simultaneous two-point measurements in the azimuthal and axial directions were conducted by using a two-channel microwave reflectometer with multi horn antennas. The azimuthal mode number (m) of the DF waves was confirmed at inner plasma region for the first time, and was zero, which satisfies azimuthal mode matching with the m = -1 AIC waves. In addition, it was shown that the DF waves were radially localized in an inner region, which is different from rather broad profiles of the AIC waves.

本文言語英語
論文番号2402011
ジャーナルPlasma and Fusion Research
14
Specialissue1
DOI
出版ステータス出版済み - 2019

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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