TY - JOUR
T1 - Observation of axial neutral-gas flow reversal in an ECR plasma
AU - Abe, Emika
AU - Terasaka, Kenichiro
AU - Yoshimura, Shinji
AU - Aramaki, Mitsutoshi
AU - Tanaka, Masayoshi Y.
N1 - Funding Information:
This work was supported by JSPS KAKENHI (Grant Nos JP17K14425 and JP17H03000) and NIFS Collaboration Research Program NIFS18KBAP047
Publisher Copyright:
© 2019 The Japan Society of Plasma Science and Nuclear Fusion Research.
PY - 2019
Y1 - 2019
N2 - Axial neutral gas transport has been experimentally investigated in a partially ionized cylindrical plasma. The high-accuracy laser induced fluorescence spectroscopy is embraced to evaluate the absolute flow velocity of ions and neutral particles, and the axial flow velocity associated with the mass transport parallel to the magnetic field has been measured by changing the filling gas pressure. It has been found that the neutral gas flow is spatially non-uniform, and the axial flow reversal takes place under a certain circumstance. The experimental results indicate that non-uniformity of neutral gas flow field is generated as a consequence of the plasma-neutral coupling and the axial neutral transport plays an important role in the plasma structure formation.
AB - Axial neutral gas transport has been experimentally investigated in a partially ionized cylindrical plasma. The high-accuracy laser induced fluorescence spectroscopy is embraced to evaluate the absolute flow velocity of ions and neutral particles, and the axial flow velocity associated with the mass transport parallel to the magnetic field has been measured by changing the filling gas pressure. It has been found that the neutral gas flow is spatially non-uniform, and the axial flow reversal takes place under a certain circumstance. The experimental results indicate that non-uniformity of neutral gas flow field is generated as a consequence of the plasma-neutral coupling and the axial neutral transport plays an important role in the plasma structure formation.
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U2 - 10.1585/pfr.14.1201066
DO - 10.1585/pfr.14.1201066
M3 - Article
AN - SCOPUS:85063648792
SN - 1880-6821
VL - 14
JO - Plasma and Fusion Research
JF - Plasma and Fusion Research
IS - 1
M1 - 1201066
ER -