Nuclear Materials and Energy (Mar 2021)
Toroidal flow measurements of impurity ions in QUEST ECH plasmas using multiple viewing chords emission spectroscopy
- N. Yoneda,
- T. Shikama,
- K. Hanada,
- S. Mori,
- T. Onchi,
- K. Kuroda,
- M. Hasuo,
- A. Ejiri,
- K. Matsuzaki,
- Y. Osawa,
- Y. Peng,
- Y. Kawamata,
- S. Sakamoto,
- H. Idei,
- T. Ido,
- K. Nakamura,
- Y. Nagashima,
- R. Ikezoe,
- M. Hasegawa,
- A. Higashijima,
- T. Nagata,
- S. Shimabukuro
Affiliations
- N. Yoneda
- Department of Mechanical Engineering and Science, Kyoto University, Kyoto 615-8540, Japan; Corresponding author.
- T. Shikama
- Department of Mechanical Engineering and Science, Kyoto University, Kyoto 615-8540, Japan
- K. Hanada
- Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan
- S. Mori
- Department of Mechanical Engineering and Science, Kyoto University, Kyoto 615-8540, Japan
- T. Onchi
- Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan
- K. Kuroda
- Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan
- M. Hasuo
- Department of Mechanical Engineering and Science, Kyoto University, Kyoto 615-8540, Japan
- A. Ejiri
- Graduate School of Frontier Science, The University of Tokyo, Kashiwa 277-8561, Japan
- K. Matsuzaki
- Graduate School of Frontier Science, The University of Tokyo, Kashiwa 277-8561, Japan
- Y. Osawa
- Graduate School of Frontier Science, The University of Tokyo, Kashiwa 277-8561, Japan
- Y. Peng
- Graduate School of Frontier Science, The University of Tokyo, Kashiwa 277-8561, Japan
- Y. Kawamata
- Graduate School of Frontier Science, The University of Tokyo, Kashiwa 277-8561, Japan
- S. Sakamoto
- Graduate School of Frontier Science, The University of Tokyo, Kashiwa 277-8561, Japan
- H. Idei
- Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan
- T. Ido
- Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan
- K. Nakamura
- Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan
- Y. Nagashima
- Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan
- R. Ikezoe
- Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan
- M. Hasegawa
- Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan
- A. Higashijima
- Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan
- T. Nagata
- Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan
- S. Shimabukuro
- Research Institute for Applied Mechanics, Kyushu University, Fukuoka 816-8580, Japan
- Journal volume & issue
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Vol. 26
p. 100905
Abstract
A spectroscopic system with multiple viewing chords was developed for QUEST (Q-shu University Experiment with Steady-State Spherical Tokamak) to measure the spatial distribution of ion toroidal velocities in discharges sustained by electron cyclotron resonance heating (ECH). Twenty-four viewing chords were aligned in the midplane and C III emission line spectra were measured for three types of ECH discharge under different magnetic field configurations. By applying an inversion method to the measured spectra, we evaluated the radial distributions of C2+ ion emissivity, temperature, and toroidal velocity. The error in the evaluated velocity was estimated to be less than 5 km/s. It was found that the velocity depends on the magnetic field configuration.
