Plasma and Fusion Research
Online ISSN : 1880-6821
ISSN-L : 1880-6821
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Isotope Effect for Plasma Detachment in Helium and Hydrogen/Deuterium Mixture Plasmas
Xinyue GUOHirohiko TANAKAShin KAJITANoriyasu OHNOShogo HATTORIKeiji SAWADA
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2022 年 17 巻 p. 2402027

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To investigate the isotope effect on the plasma detachment in helium (He) and hydrogen (H)/deuterium (D) mixture plasmas, we performed H2, D2 or He gas puffing into He plasma in the linear plasma device NAGDIS-II. Axial distributions of electron density (ne) and electron temperature (Te) were obtained using a movable Langmuir probe. Additionally, optical emission spectroscopy (OES) was applied to measure axial distributions of Balmer lines and He I lines. When the neutral gas pressure was high (ΔPn = 7 ∼10 mTorr), ne distribution in He-D2 mixture plasma was similar to that in pure He plasma, showing a sharp decrease at the downstream region where Te < 1 eV. In contrast, in He-H2 mixture plasma, a decrease in ne was confirmed from upstream region where Te > 1 eV. The upstream Hα/Hγ in He-H2 plasma was significantly larger than the Dα/Dγ in He-D2 plasma at the same Te. This result indicated that molecular activated recombination (MAR) processes significantly occurred in He-H2 plasma, while electron-ion recombination (EIR) processes were dominant in He-D2 and pure He plasmas.

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© 2022 by The Japan Society of Plasma Science and Nuclear Fusion Research
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