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

Autor: Arseniy Kuzmin, Takeshi Ido, Yi Peng, Takahiro Nagata, Shun Shimabukuro, Ryuya Ikezoe, Shinichiro Kado, Taiichi Shikama, Takumi Onchi, Keiji Sawada, Kazuaki Hanada, Masahiro Hasuo, Kazuo Nakamura, Hiroshi Idei, Kyohei Matsuzaki, Satoru Mori, Aki Higashijima, Akira Ejiri, Makoto Hasegawa, Yoshihiko Nagashima, Kengo Kuroda, Yuki Osawa, Nao Yoneda
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Atoms
Volume 8
Issue 3
Atoms, Vol 8, Iss 44, p 44 (2020)
ISSN: 2218-2004
DOI: 10.3390/atoms8030044
Popis: 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 H&delta
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&ndash
1016 m&minus
3 and an ionization degree of 1&ndash
0.85 in the plasma.
Databáze: OpenAIRE