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 SEKI; Fujio SHIMPO; Yoshihiko NAGASHIMA; Osamu WATANABE; Takuma YAMADA

doi:10.1585/pfr.9.3402040

Regular Articles

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 SEKI, Fujio SHIMPO, Yoshihiko NAGASHIMA, Osamu WATANABE, Takuma YAMADA

Author information

Takahiro SHINYA
The University of Tokyo
Akira EJIRI
The University of Tokyo
Yuichi TAKASE
The University of Tokyo
Takuma WAKATSUKI
The University of Tokyo
Takuya OOSAKO
The University of Tokyo
Naoto TSUJII
The University of Tokyo
Hidetoshi KAKUDA
The University of Tokyo
Hirokazu FURUI
The University of Tokyo
Junichi HIRATSUKA
The University of Tokyo
Takuma INADA
The University of Tokyo
Kazuhiro IMAMURA
The University of Tokyo
Keishun NAKAMURA
The University of Tokyo
Ayaka NAKANISHI
The University of Tokyo
Masateru SONEHARA
The University of Tokyo
Hiro TOGASHI
The University of Tokyo
Shintaro TSUDA
The University of Tokyo
Takashi YAMAGUCHI
The University of Tokyo
Hiroshi KASAHARA
National Institute for Fusion Science
Kenji SAITO
National Institute for Fusion Science
Tetsuo SEKI
National Institute for Fusion Science
Fujio SHIMPO
National Institute for Fusion Science
Yoshihiko NAGASHIMA
Kyushu University
Osamu WATANABE
Kyushu University
Takuma YAMADA
Kyushu University

Keywords: RF magnetic probe, lower hybrid wave, spherical tokamak, wavevector, polarization

JOURNAL FREE ACCESS

2014 Volume 9 Pages 3402040

DOI https://doi.org/10.1585/pfr.9.3402040

Details

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.

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