Spectroscopic Measurement of Hydrogen Atom Density in a Plasma Produced with 28 GHz ECH in QUEST

The spatial distribution of the hydrogen atom density was evaluated in a spherical tokamak (ST) plasma sustained only with 28 GHz electron cyclotron heating (ECH). The radially resolved Hδ emissivity was measured using multiple viewing chord spectroscopy and Abel inversion. A collisional-radiative (...

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Bibliographic Details
Published in:Atoms 2020-09, Vol.8 (3), p.44
Main Authors: Mori, Satoru, Shikama, Taiichi, Hanada, Kazuaki, Yoneda, Nao, Kuzmin, Arseniy, Hasuo, Masahiro, Idei, Hiroshi, Onchi, Takumi, Ejiri, Akira, Osawa, Yuki, Peng, Yi, Matsuzaki, Kyohei, Kado, Shinichiro, Sawada, Keiji, Ido, Takeshi, Nakamura, Kazuo, Ikezoe, Ryuya, Nagashima, Yoshihiko, Hasegawa, Makoto, Kuroda, Kengo, Higashijima, Aki, Nagata, Takahiro, Shimabukuro, Shun
Format: Article
Language:English
Subjects:
atom
Cyclotrons
Density
ECH
Electron cyclotron heating
Emissivity
Hydrogen
neutral
Optics
Plasma
QUEST
Spatial distribution
spectroscopy
Spectrum analysis
Spherical plasmas
spherical tokamak
Tokamak devices
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Summary:The spatial distribution of the hydrogen atom density was evaluated in a spherical tokamak (ST) plasma sustained only with 28 GHz electron cyclotron heating (ECH). The radially resolved Hδ emissivity was measured using multiple viewing chord spectroscopy and Abel inversion. A collisional-radiative (CR) model analysis of the emissivity resulted in a ground-state hydrogen atom density of 1015–1016 m−3 and an ionization degree of 1–0.85 in the plasma.
ISSN:2218-2004
2218-2004
DOI:10.3390/atoms8030044