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Title: Spectroscopic measurement of increases in hydrogen molecular rotational temperature with plasma-facing surface temperature and due to collisional-radiative processes in tokamaks
Authors: Yoneda, N.
Shikama, T.
Scotti, F.
Hanada, K.
Iguchi, H.
Idei, H.
Onchi, T.
Ejiri, A.
Ido, T.
Kono, K.
Peng, Y.
Osawa, Y.
Yatomi, G.
Kidani, A.
Kudo, M.
Hiraka, R.
Takeda, K.
Bell, R.E.
Maan, A.
Boyle, D.P.
Majeski, R.
Soukhanovskii, V.A.
Groth, M.
McLean, A.G.
Wilcox, R.S.
Lasnier, C.
Nakamura, K.
Nagashima, Y.
Ikezoe, R.
Hasegawa, M.
Kuroda, K.
Higashijima, A.
Nagata, T.
Shimabukuro, S.
Niiya, I.
Sekiya, I.
Hasuo, M.
Author's alias: 米田, 奈生
四竈, 泰一
花田, 和明
井口, 拓己
出射, 浩
恩地, 拓己
江尻, 晶
井戸, 毅
河野, 香
彭, 翊
大澤, 佑規
弥富, 豪
木谷, 彰宏
工藤, 倫大
平賀, 涼輔
武田, 康佑
中村, 一男
永島, 芳彦
池添, 竜也
長谷川, 真
黒田, 賢剛
東島, 亜紀
永田, 貴大
島袋, 瞬
新谷, 一朗
関谷, 泉
蓮尾, 昌裕
Keywords: emission spectroscopy
hydrogen molecule
rotational temperature
plasma–surface interaction
QUEST
LTX-β
DIII-D
Issue Date: Sep-2023
Publisher: IOP Publishing
Journal title: Nuclear Fusion
Volume: 63
Issue: 9
Thesis number: 096004
Abstract: Spatially resolved rotational temperature of ground state hydrogen molecules desorbed from plasma-facing surface was measured in QUEST, LTX-β, and DIII-D tokamaks, and the increases of the rotational temperature with the surface temperature and due to collisional-radiative processes in the plasmas were evaluated. The increase due to collisional-radiative processes was calculated by solving rate equations considering electron and proton collisional excitation and deexcitation and spontaneous emission. The calculation results suggest a high sensitivity for the rotational temperature to electron and proton densities, but a negligible sensitivity to the electron, proton, and surface temperatures. In the three tokamaks with different plasma parameters and plasma-facing surface materials, the spatial profile of the rotational temperature was estimated using Fulcher-α emission lines (600–608 nm). In QUEST, the spatial profile of the rotational temperature was estimated from spatially resolved spectra. In the other tokamaks, the rotational temperature was evaluated assuming a single point emission with a location determined from the Fulcher-α emission profile as measured with a filtered camera. In metal-walled devices QUEST and LTX-β, the rotational temperature increased with the surface temperature, and the calculated collisional-radiative increase is consistent with measured increase assuming that the rotational temperature at the surface is approximately 500–600 K higher than the surface temperature. In DIII-D with carbon walls, a larger collisional-radiative increase than the other tokamaks was observed because of the higher density leading to a large difference from the calculated increase compared to the other smaller tokamaks. Measurement of the Fulcher-α emission profile with higher spatial resolution in DIII-D may reduce the difference and reveal the effect of the surface temperature on the rotational temperature. These results show the increases in the rotational temperature with the surface temperature and due to the collisional-radiative processes.
Description: 水素分子の回転温度を予測し、プラズマ再結合を効果的に起こす. 京都大学プレスリリース. 2023-07-28.
Fusion model hot off the wall: Predicting molecular rotational temperature for enhanced plasma recombination. 京都大学プレスリリース. 2023-07-28.
Rights: © 2023 The Author(s). Published on behalf of IAEA by IOP Publishing Ltd
Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
URI: http://hdl.handle.net/2433/284484
DOI(Published Version): 10.1088/1741-4326/acd4d1
Related Link: https://www.t.kyoto-u.ac.jp/ja/research/topics/20230728
https://www.kyoto-u.ac.jp/en/research-news/2023-07-28
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