Spectroscopic Measurements of Impurity Ion Toroidal and Poloidal Flow Velocities and Their Dependence on Vertical Magnetic Field in QUEST Toroidal ECR Plasmas

Nao YONEDA; Taiichi SHIKAMA; Hideki ZUSHI; Kazuaki HANADA; Akinobu FUJIKAWA; Takumi ONCHI; Kengoh KURODA; Kuniaki NII; Masahiro HASUO; Makoto HASEGAWA; Hiroshi IDEI; Kazuo NAKAMURA; Yoshihiko NAGASHIMA; Aki HIGASHIJIMA; Takahiro NAGATA

doi:10.1585/pfr.13.3402087

Regular Articles

Spectroscopic Measurements of Impurity Ion Toroidal and Poloidal Flow Velocities and Their Dependence on Vertical Magnetic Field in QUEST Toroidal ECR Plasmas

Nao YONEDA, Taiichi SHIKAMA, Hideki ZUSHI, Kazuaki HANADA, Akinobu FUJIKAWA, Takumi ONCHI, Kengoh KURODA, Kuniaki NII, Masahiro HASUO, Makoto HASEGAWA, Hiroshi IDEI, Kazuo NAKAMURA, Yoshihiko NAGASHIMA, Aki HIGASHIJIMA, Takahiro NAGATA

Author information

Nao YONEDA
Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University
Taiichi SHIKAMA
Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University
Hideki ZUSHI
Research Institute for Applied Mechanics, Kyushu University
Kazuaki HANADA
Research Institute for Applied Mechanics, Kyushu University
Akinobu FUJIKAWA
Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University
Takumi ONCHI
Research Institute for Applied Mechanics, Kyushu University
Kengoh KURODA
Research Institute for Applied Mechanics, Kyushu University
Kuniaki NII
Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University
Masahiro HASUO
Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University
Makoto HASEGAWA
Research Institute for Applied Mechanics, Kyushu University
Hiroshi IDEI
Research Institute for Applied Mechanics, Kyushu University
Kazuo NAKAMURA
Research Institute for Applied Mechanics, Kyushu University
Yoshihiko NAGASHIMA
Research Institute for Applied Mechanics, Kyushu University
Aki HIGASHIJIMA
Research Institute for Applied Mechanics, Kyushu University
Takahiro NAGATA
Research Institute for Applied Mechanics, Kyushu University

Keywords: emission spectroscopy, flow measurement, non-inductive startup, electron cyclotron resonance (ECR) heated plasma, spatial distribution

JOURNAL FREE ACCESS

2018 Volume 13 Pages 3402087

DOI https://doi.org/10.1585/pfr.13.3402087

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Abstract

Toroidal electron cyclotron resonance (ECR) plasma is an ECR heated plasma in an open toroidal magnetic field. The plasma contains no toroidal current and is used for the pre-ionization and non-inductive startup of a tokamak plasma. To obtain a deeper understanding of the basic properties of the plasmas produced in the spherical tokamak QUEST (Q-shu University Experiment with steady-state Spherical Tokamak), we have developed an optical emission spectroscopy system with multiple viewing chords and have used it to measure the spatial distributions of the toroidal and poloidal flow velocities of C²⁺ions. We compare the measured velocities with those calculated from the ion drift equations using the plasma parameters reported for a similar spherical tokamak, LATE (the Low Aspect Ratio Torus Experiment).

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