TY - JOUR
T1 - Toroidal flow measurements of impurity ions in QUEST ECH plasmas using multiple viewing chords emission spectroscopy
AU - Yoneda, N.
AU - Shikama, T.
AU - Hanada, K.
AU - Mori, S.
AU - Onchi, T.
AU - Kuroda, K.
AU - Hasuo, M.
AU - Ejiri, A.
AU - Matsuzaki, K.
AU - Osawa, Y.
AU - Peng, Y.
AU - Kawamata, Y.
AU - Sakamoto, S.
AU - Idei, H.
AU - Ido, T.
AU - Nakamura, K.
AU - Nagashima, Y.
AU - Ikezoe, R.
AU - Hasegawa, M.
AU - Higashijima, A.
AU - Nagata, T.
AU - Shimabukuro, S.
N1 - Funding Information:
This work was supported by Mori Manufacturing Research and Technology Foundation, bilateral collaboration programs of NIFS (NIFS19KUTR140, NIFS20KUTR156), and collaborative research program of RIAM, Kyushu University (30FP-38). We would like to thank the staff members of the machine shop of Kyoto University for their help with the fabrication of the spectroscopic system.
Publisher Copyright:
© 2021 The Author(s)
PY - 2021/3
Y1 - 2021/3
N2 - 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.
AB - 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.
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U2 - 10.1016/j.nme.2021.100905
DO - 10.1016/j.nme.2021.100905
M3 - Article
AN - SCOPUS:85090394257
SN - 2352-1791
VL - 26
JO - Nuclear Materials and Energy
JF - Nuclear Materials and Energy
M1 - 100905
ER -