Plasma and Fusion Research

Volume 11, 1402002 (2016)

Regular Articles

A Calibration of Setting of Mach Probes by Observing GAM Oscillations
Kimitaka ITOH1,2), Kaijun ZHAO3), Jiaqi DONG3), Sanae-I. ITOH2,4), Akihide FUJISAWA2,4), Shigeru INAGAKI2,4), Makoto SASAKI2,4), Yoshihiko NAGASHIMA2,4), Yusuke KOSUGA2,4,5), Jun CHENG3) and Tatsuya KOBAYASHI1)
1)National Institute for Fusion Science, Toki 509-5292, Japan
2)Research Center for Plasma Turbulence, Kyushu University, Kasuga 816-8580, Japan
3)Southwestern Institute of Physics, PO Box 432, Chengdu, People's Republic of China
4)Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
5)Institute for Advanced Study, Kyushu University, Fukuoka 812-8581, Japan
(Received 10 December 2015 / Accepted 25 December 2015 / Published 10 February 2016)


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.


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

DOI: 10.1585/pfr.11.1402002


  • [1] C. Hidalgo et al., Phys. Rev. Lett. 91, 065001 (2003).
  • [2] B. Labit et al., Phys. Plasmas 18, 032308 (2011).
  • [3] S. Oldenbuerger et al., Plasma Fusion Res. 7, 2401146 (2012).
  • [4] S. Inagaki, submitted to Sci. Rep. (2015).
  • [5] K.J. Zhao, presented at the Japan-China Joint-Data-Analysis Workshop (November 2015, at Kyushu University).
  • [6] S.-I. Itoh, Phys. Fluids B 4, 796 (1992).
  • [7] P.H. Diamond et al., Nucl. Fusion 53, 104019 (2015).
  • [8] Y. Kosuga, S.-I. Itoh and K. Itoh, Plasma Fusion Res. 10, 3401024 (2015).
  • [9] J.P. Gunn et al., Phys. Plasmas 8, 1995 (2001).
  • [10] S.-I. Itoh, K. Itoh, M. Sasaki, A. Fujisawa, T. Ido and Y. Nagashima, Plasma Phys. Control. Fusion 49, L7-L10 (2007).
  • [11] Y. Nagashima, K. Itoh, A. Fujisawa, K. Shinohara, S.-I. Itoh, T. Ido, M. Yagi, K. Hoshino, A. Ejiri, Y. Takase, K. Uehara, Y. Miura, Plasma Phys. Control. Fusion 51, 065019 (2009).
  • [12] P.H. Diamond, S.-I. Itoh, K. Itoh and T.S. Hahm, Plasma Phys. Control. Fusion 47, R35 (2005).
  • [13] B.B. Kadomtsev, Plasma Turbulence (Academic Press Inc., New York, 1965).