Measurements of directional flow using a directional Langmuir probe in weakly magnetized plasmas

T. Shikama, S. Kado, Atsushi Okamoto, S. Tanaka

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Measurement of flow directed with respect to the magnetic field is performed using a directional Langmuir probe (DLP). A previously proposed practical formula for measurement of the Mach number under a weakly magnetized condition is modified for application to the directional flow field which consists of parallel and azimuthal flow components. The effect of density gradient caused by the rotational DLP measurement in the measurement of the radial profile of ion current angular distribution is modified. For the verification of the DLP measurement, parallel flow velocity is measured from the Doppler shift of Hen emission, while azimuthal flow velocity is calculated from E × B and diamagnetic drifts. It is revealed that this method provides plausible Mach numbers in the parallel and azimuthal directions with inclusion of the effect of density gradient.

Original languageEnglish
Pages (from-to)427-432
Number of pages6
JournalContributions to Plasma Physics
Issue number5-6
Publication statusPublished - 2006 Jul 31


  • Directional Langmuir probe
  • Divertor
  • Flow
  • MAP-II
  • Mach probe
  • Weakly magnetized plasma

ASJC Scopus subject areas

  • Condensed Matter Physics


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