Behavior of 23S metastable state He atoms in low-temperature recombining plasmas

Shin Kajita, Tadashi Tsujihara, Mitsutoshi Aramaki, Hennie Van Der Meiden, Hiroshi Oshima, Noriyasu Ohno, Hirohiko Tanaka, Ryo Yasuhara, Tsuyoshi Akiyama, Keisuke Fujii, Taiichi Shikama

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22 Scopus citations

Abstract

We measured the electron density and temperature using laser Thomson scattering and metastable state (23S) of He atoms by laser absorption spectroscopy in the detached recombining plasmas in the divertor simulator NAGDIS-II. Using the measured electron density and temperature combined with the particle trajectory trace simulation, we discussed the behavior of the metastable state He atoms based on comparisons with the experimental results. It is shown that the metastable state atoms are mainly produced in the peripheral region of the plasma column, where the temperature is lower than the central part, and diffused in the vacuum vessel. It was shown that the 0D model is not valid and the transport of the metastable states is to be taken into account for the population distribution of He atoms in the detached plasmas.

Original languageEnglish
Article number073301
JournalPhysics of Plasmas
Volume24
Issue number7
DOIs
StatePublished - Jul 1 2017
Externally publishedYes

Funding

FundersFunder number
Japan Society for the Promotion of Science16H02440

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