A Calibration of Setting of Mach Probes by Observing GAM Oscillations

Kimitaka ITOH; Kaijun ZHAO; Jiaqi DONG; Sanae-I. ITOH; Akihide FUJISAWA; Shigeru INAGAKI; Makoto SASAKI; Yoshihiko NAGASHIMA; Yusuke KOSUGA; Jun CHENG; Tatsuya KOBAYASHI

doi:10.1585/pfr.11.1402002

Regular Articles

A Calibration of Setting of Mach Probes by Observing GAM Oscillations

Kimitaka ITOH, Kaijun ZHAO, Jiaqi DONG, Sanae-I. ITOH, Akihide FUJISAWA, Shigeru INAGAKI, Makoto SASAKI, Yoshihiko NAGASHIMA, Yusuke KOSUGA, Jun CHENG, Tatsuya KOBAYASHI

Author information

Kimitaka ITOH
National Institute for Fusion Science
Research Center for Plasma Turbulence, Kyushu University
Kaijun ZHAO
Southwestern Institute of Physics
Jiaqi DONG
Southwestern Institute of Physics
Sanae-I. ITOH
Research Center for Plasma Turbulence, Kyushu University
Research Institute for Applied Mechanics, Kyushu University
Akihide FUJISAWA
Research Center for Plasma Turbulence, Kyushu University
Research Institute for Applied Mechanics, Kyushu University
Shigeru INAGAKI
Research Center for Plasma Turbulence, Kyushu University
Research Institute for Applied Mechanics, Kyushu University
Makoto SASAKI
Research Center for Plasma Turbulence, Kyushu University
Research Institute for Applied Mechanics, Kyushu University
Yoshihiko NAGASHIMA
Research Center for Plasma Turbulence, Kyushu University
Research Institute for Applied Mechanics, Kyushu University
Yusuke KOSUGA
Research Center for Plasma Turbulence, Kyushu University
Research Institute for Applied Mechanics, Kyushu University
Institute for Advanced Study, Kyushu University
Jun CHENG
Southwestern Institute of Physics
Tatsuya KOBAYASHI
National Institute for Fusion Science

Keywords: geodesic acoustic mode, probe measurement, Mach probe, probe alignment

JOURNAL FREE ACCESS

2016 Volume 11 Pages 1402002

DOI https://doi.org/10.1585/pfr.11.1402002

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Abstract

The influence of relative displacement of Mach probe (which is placed near the top of magnetic surface) on the interference of signals is discussed. An error can arise in measured value of poloidal electric field. The Mach number perturbation at the GAM frequency has an interference from the density perturbation. The interference from the density perturbation can propagate to all of Mach number measurement. By observing the signals associated with GAM oscillations, the error in setting the probe arrays can be detected. This result can be applied to correct the positioning of probes.

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