Comparison of electron temperature and density measured by helium line intensity ratio and Thomson scattering methods in ECH spherical tokamak plasma

Takumi Komiyama; Taiichi Shikama; Kazuaki Hanada; Takeshi Ido; Takumi Onchi; Kaori Kono; Akira Ejiri; Makoto Hasegawa; Satoshi Inoue; Masahiro Hasuo; Hiroshi Idei; Qilin Yue; Kengo Kuroda; Aki Higashijima; Pakkapawn Prapan

doi:10.1088/1361-6587/ad2c2a

Comparison of electron temperature and density measured by helium line intensity ratio and Thomson scattering methods in ECH spherical tokamak plasma

Takumi Komiyama, Taiichi Shikama, Kazuaki Hanada, Takeshi Ido, Takumi Onchi, Kaori Kono, Akira Ejiri, Makoto Hasegawa, Satoshi Inoue, Masahiro Hasuo, Hiroshi Idei, Qilin Yue, Kengo Kuroda, Aki Higashijima, Pakkapawn Prapan

Research output: Contribution to journal › Article › peer-review

Abstract

The electron temperature and density profiles in the midplane of a spherical tokamak plasma produced by electron cyclotron heating (ECH) in Q-shu University experiment with steady-state spherical tokamak (QUEST) are measured by the helium line intensity ratio method. The measured profiles are compared with those obtained by the Thomson scattering method, and the measured temperatures and densities are found to agree within factors of ∼2 and ∼6, respectively. Taken together with the previous results of comparisons performed in the scrape-off layers of several toroidal devices, the same degree of agreement between the helium line intensity ratio method and other methods is obtained in the ranges of 7-100 eV for temperature and 4 × 10¹⁶-1 × 10¹⁹ m⁻³ for density.

Original language	English
Article number	045018
Journal	Plasma Physics and Controlled Fusion
Volume	66
Issue number	4
DOIs	https://doi.org/10.1088/1361-6587/ad2c2a
Publication status	Published - Apr 2024
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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10.1088/1361-6587/ad2c2a

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Komiyama, T., Shikama, T., Hanada, K., Ido, T., Onchi, T., Kono, K., Ejiri, A., Hasegawa, M., Inoue, S., Hasuo, M., Idei, H., Yue, Q., Kuroda, K., Higashijima, A., & Prapan, P. (2024). Comparison of electron temperature and density measured by helium line intensity ratio and Thomson scattering methods in ECH spherical tokamak plasma. Plasma Physics and Controlled Fusion, 66(4), Article 045018. https://doi.org/10.1088/1361-6587/ad2c2a

Komiyama, T, Shikama, T, Hanada, K , Ido, T , Onchi, T, Kono, K, Ejiri, A, Hasegawa, M, Inoue, S, Hasuo, M, Idei, H, Yue, Q, Kuroda, K, Higashijima, A & Prapan, P 2024, 'Comparison of electron temperature and density measured by helium line intensity ratio and Thomson scattering methods in ECH spherical tokamak plasma', Plasma Physics and Controlled Fusion, vol. 66, no. 4, 045018. https://doi.org/10.1088/1361-6587/ad2c2a

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title = "Comparison of electron temperature and density measured by helium line intensity ratio and Thomson scattering methods in ECH spherical tokamak plasma",

abstract = "The electron temperature and density profiles in the midplane of a spherical tokamak plasma produced by electron cyclotron heating (ECH) in Q-shu University experiment with steady-state spherical tokamak (QUEST) are measured by the helium line intensity ratio method. The measured profiles are compared with those obtained by the Thomson scattering method, and the measured temperatures and densities are found to agree within factors of ∼2 and ∼6, respectively. Taken together with the previous results of comparisons performed in the scrape-off layers of several toroidal devices, the same degree of agreement between the helium line intensity ratio method and other methods is obtained in the ranges of 7-100 eV for temperature and 4 × 1016-1 × 1019 m−3 for density.",

keywords = "ECH, QUEST, SOL, helium line intensity ratio, spectroscopy, spherical tokamak",

author = "Takumi Komiyama and Taiichi Shikama and Kazuaki Hanada and Takeshi Ido and Takumi Onchi and Kaori Kono and Akira Ejiri and Makoto Hasegawa and Satoshi Inoue and Masahiro Hasuo and Hiroshi Idei and Qilin Yue and Kengo Kuroda and Aki Higashijima and Pakkapawn Prapan",

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doi = "10.1088/1361-6587/ad2c2a",

language = "English",

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T1 - Comparison of electron temperature and density measured by helium line intensity ratio and Thomson scattering methods in ECH spherical tokamak plasma

AU - Komiyama, Takumi

AU - Shikama, Taiichi

AU - Hanada, Kazuaki

AU - Ido, Takeshi

AU - Onchi, Takumi

AU - Kono, Kaori

AU - Ejiri, Akira

AU - Hasegawa, Makoto

AU - Inoue, Satoshi

AU - Hasuo, Masahiro

AU - Idei, Hiroshi

AU - Yue, Qilin

AU - Kuroda, Kengo

AU - Higashijima, Aki

AU - Prapan, Pakkapawn

PY - 2024/4

Y1 - 2024/4

N2 - The electron temperature and density profiles in the midplane of a spherical tokamak plasma produced by electron cyclotron heating (ECH) in Q-shu University experiment with steady-state spherical tokamak (QUEST) are measured by the helium line intensity ratio method. The measured profiles are compared with those obtained by the Thomson scattering method, and the measured temperatures and densities are found to agree within factors of ∼2 and ∼6, respectively. Taken together with the previous results of comparisons performed in the scrape-off layers of several toroidal devices, the same degree of agreement between the helium line intensity ratio method and other methods is obtained in the ranges of 7-100 eV for temperature and 4 × 1016-1 × 1019 m−3 for density.

AB - The electron temperature and density profiles in the midplane of a spherical tokamak plasma produced by electron cyclotron heating (ECH) in Q-shu University experiment with steady-state spherical tokamak (QUEST) are measured by the helium line intensity ratio method. The measured profiles are compared with those obtained by the Thomson scattering method, and the measured temperatures and densities are found to agree within factors of ∼2 and ∼6, respectively. Taken together with the previous results of comparisons performed in the scrape-off layers of several toroidal devices, the same degree of agreement between the helium line intensity ratio method and other methods is obtained in the ranges of 7-100 eV for temperature and 4 × 1016-1 × 1019 m−3 for density.

KW - ECH

KW - QUEST

KW - SOL

KW - helium line intensity ratio

KW - spectroscopy

KW - spherical tokamak

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U2 - 10.1088/1361-6587/ad2c2a

DO - 10.1088/1361-6587/ad2c2a

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SN - 0741-3335

VL - 66

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 4

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ER -

Comparison of electron temperature and density measured by helium line intensity ratio and Thomson scattering methods in ECH spherical tokamak plasma

Abstract

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