Identification of waves by RF magnetic probes during lower hybrid wave injection experiments on the TST-2 spherical tokamak

Takahiro Shinya, Akira Ejiri, Yuichi Takase, Takuma Wakatsuki, Takuya Oosako, Naoto Tsujii, Hidetoshi Kakuda, Hirokazu Furui, Junichi Hiratsuka, Takuma Inada, Kazuhiro Imamura, Keishun Nakamura, Ayaka Nakanishi, Masateru Sonehara, Hiro Togashi, Shintaro Tsuda, Takashi Yamaguchi, Hiroshi Kasahara, Kenji Saito, Tetsuo SekiFujio Shimpo, Yoshihiko Nagashima, Osamu Watanabe, Takuma Yamada

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2 Citations (Scopus)

Abstract

RF magnetic probes can be used to measure not only the wavevector, but also the polarization of waves in plasmas. A 5-channel RF magnetic probe (5ch-RFMP) was installed in the TST-2 spherical tokamak and the waves were studied in detail during lower hybrid wave injection experiments. From the polarization measurements, the poloidal RF magnetic field is found to be dominant. In addition to polarization, components of k perpendicular to the major radial direction were obtained from phase differences among the five channels. The radial wavenumber was obtained by scanning the radial position of the 5ch-RFMP on a shot by shot basis. The measured wavevector and polarization in the plasma edge region were consistent with those calculated from the wave equation for the slow wave branch. While the waves with small and large k∥ were excited by the antenna, only the small k∥ component was measured by the 5ch-RFMP; this suggests that the waves with larger k∥ were absorbed by the plasma.

Original languageEnglish
Article number3402040
JournalPlasma and Fusion Research
Volume9
Issue numberSpecialIssue2
DOIs
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Shinya, T., Ejiri, A., Takase, Y., Wakatsuki, T., Oosako, T., Tsujii, N., Kakuda, H., Furui, H., Hiratsuka, J., Inada, T., Imamura, K., Nakamura, K., Nakanishi, A., Sonehara, M., Togashi, H., Tsuda, S., Yamaguchi, T., Kasahara, H., Saito, K., ... Yamada, T. (2014). Identification of waves by RF magnetic probes during lower hybrid wave injection experiments on the TST-2 spherical tokamak. Plasma and Fusion Research, 9(SpecialIssue2), [3402040]. https://doi.org/10.1585/pfr.9.3402040