Measurement of axial phase difference of density fluctuations owing to spontaneously excited waves by using microwave reflectometer on GAMMA 10/PDX

R. Sekine, M. Hirata, R. Ikezoe, S. Jang, Y. Kubota, H. Kayano, K. Sugata, T. Aizawa, D. Noguchi, D. Kim, Y. Sugimoto, R. Matsuura, H. Yamazaki, M. Ichimura, M. Yoshikawa, J. Kohagura, Y. Nakashima, N. Ezumi, M. Sakamoto

研究成果: Contribution to journalArticle査読

抄録

In the GAMMA 10/PDX tandem mirror, plasma with strong ion-temperature anisotropy is produced by using the ion cyclotron range of frequency waves. This anisotropy of ion temperature causes several Alfvén-Ion-Cyclotron (AIC) waves to spontaneously excite in the frequency range just below the ion cyclotron frequency. In addition, difference-frequency (DF) waves are excited in the radial inner region of the plasma by wave-wave coupling among the AIC waves. The radial density profiles were measured at multi-axial positions using a frequency-modulation reflectometer with an axial array of microwave antennas, and an axial variation of the density was found to be significant. In addition, a relative phase difference of the DF wave between axially separated two points was first obtained by finely choosing the probing frequency of the reflectometers with a maximum coherence used as a measure, indicating that the DF wave is a propagating wave, while the pump AIC waves are standing waves in the axial region of measurement.

本文言語英語
論文番号053506
ジャーナルReview of Scientific Instruments
92
5
DOI
出版ステータス出版済み - 5 1 2021

All Science Journal Classification (ASJC) codes

  • 器械工学

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