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

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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Main Authors: H. Natsume, H. Tanaka, S. Kajita, M. Yoshikawa, M. Seki, H. Ohshima, N. Ohno
Format: Article
Language:English
Published: AIP Publishing LLC 2019-01-01
Series:AIP Advances
Online Access:http://dx.doi.org/10.1063/1.5081929
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spelling doaj-a93953cd2c6e4e87bb5817dad0e471592020-11-24T21:54:48ZengAIP Publishing LLCAIP Advances2158-32262019-01-0191015016015016-610.1063/1.5081929060901ADVMultipoint measurements employing a microwave interferometer and a Langmuir probe in the detached linear plasmaH. Natsume0H. Tanaka1S. Kajita2M. Yoshikawa3M. Seki4H. Ohshima5N. Ohno6Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, JapanInstitute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, JapanInstitute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, JapanPlasma Research Center, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, JapanGraduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, JapanGraduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, JapanGraduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, JapanMultipoint 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.http://dx.doi.org/10.1063/1.5081929
collection DOAJ
language English
format Article
sources DOAJ
author H. Natsume
H. Tanaka
S. Kajita
M. Yoshikawa
M. Seki
H. Ohshima
N. Ohno
spellingShingle H. Natsume
H. Tanaka
S. Kajita
M. Yoshikawa
M. Seki
H. Ohshima
N. Ohno
Multipoint measurements employing a microwave interferometer and a Langmuir probe in the detached linear plasma
AIP Advances
author_facet H. Natsume
H. Tanaka
S. Kajita
M. Yoshikawa
M. Seki
H. Ohshima
N. Ohno
author_sort H. Natsume
title Multipoint measurements employing a microwave interferometer and a Langmuir probe in the detached linear plasma
title_short Multipoint measurements employing a microwave interferometer and a Langmuir probe in the detached linear plasma
title_full Multipoint measurements employing a microwave interferometer and a Langmuir probe in the detached linear plasma
title_fullStr Multipoint measurements employing a microwave interferometer and a Langmuir probe in the detached linear plasma
title_full_unstemmed Multipoint measurements employing a microwave interferometer and a Langmuir probe in the detached linear plasma
title_sort multipoint measurements employing a microwave interferometer and a langmuir probe in the detached linear plasma
publisher AIP Publishing LLC
series AIP Advances
issn 2158-3226
publishDate 2019-01-01
description 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.
url http://dx.doi.org/10.1063/1.5081929
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