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| File | Description | Size | Format | |
|---|---|---|---|---|
| j.nme.2021.100905.pdf | 6.22 MB | Adobe PDF | View/Open |
| Title: | Toroidal flow measurements of impurity ions in QUEST ECH plasmas using multiple viewing chords emission spectroscopy |
| Authors: | Yoneda, N. Shikama, T. Hanada, K. Mori, S. Onchi, T. Kuroda, K. Hasuo, M. Ejiri, A. Matsuzaki, K. Osawa, Y. Peng, Y. Kawamata, Y. Sakamoto, S. Idei, H. Ido, T. Nakamura, K. Nagashima, Y. Ikezoe, R. Hasegawa, M. Higashijima, A. Nagata, T. Shimabukuro, S. |
| Author's alias: | 米田, 奈生 四竃, 泰一 森, 暁 蓮尾, 昌裕 |
| Keywords: | Spherical tokamak ECH Magnetic configuration Toroidal flow Emission spectroscopy Inversion |
| Issue Date: | Mar-2021 |
| Publisher: | Elsevier BV |
| Journal title: | Nuclear Materials and Energy |
| Volume: | 26 |
| Thesis number: | 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. |
| Rights: | © 2021 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license. |
| URI: | http://hdl.handle.net/2433/277795 |
| DOI(Published Version): | 10.1016/j.nme.2021.100905 |
| Appears in Collections: | Journal Articles |
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