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

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Abstract

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.

Original languageEnglish
Article number2402011
JournalPlasma and Fusion Research
Volume14
Issue numberSpecialissue1
DOIs
Publication statusPublished - Jan 1 2019

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Sekine, R., Ikezoe, R., Jang, S., Hirata, M., Ichimura, M., Sakamoto, M., ... Nakashima, Y. (2019). Observation Of Density Fluctuations Originated From RF waves with two-channel reflectometer in GAMMA 10/PDX. Plasma and Fusion Research, 14(Specialissue1), [2402011]. https://doi.org/10.1585/pfr.14.2402011