Multipoint measurements employing a microwave interferometer and a Langmuir probe in the detached linear plasma

Multipoint measurements were carried out by employing a microwave interferometer (MI) and a Langmuir probe (LP) in steady-state detached plasmas in the linear plasma device NAGDIS-II to reveal the structure of fluctuations along the magnetic field. We changed the LP position along the magnetic field...

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Bibliographic Details
Published in:AIP advances 2019-01, Vol.9 (1), p.015016-015016-6
Main Authors: Natsume, H., Tanaka, H., Kajita, S., Yoshikawa, M., Seki, M., Ohshima, H., Ohno, N.
Format: Article
Language:English
Subjects:
Correlation analysis
Downstream effects
Framing cameras
Magnetic fields
Plasma
Plasmas
Time lag
Variations
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Summary:Multipoint measurements were carried out by employing a microwave interferometer (MI) and a Langmuir probe (LP) in steady-state detached plasmas in the linear plasma device NAGDIS-II to reveal the structure of fluctuations along the magnetic field. We changed the LP position along the magnetic field while the MI was fixed at an upstream position. In addition, a fast framing camera was used to identify an azimuthal mode number, and the predominant mode number was identified as m = 1. By analyzing correlations between signals observed by the LP and the MI, it was found that a time delay of 10–20 kHz fluctuations gradually decreased toward the downstream direction. The results indicate a decrease in the rotation velocity in the E × B direction, and suggest that the 10–20 kHz fluctuation forms a spiral shape.
ISSN:2158-3226
2158-3226
DOI:10.1063/1.5081929