Journal of Fusion Energy

, Volume 34, Issue 2, pp 394–397 | Cite as

Design and Fabrication of Comparative Langmuir Ball-Pen Probe (LBP) for the Tokamak

  • S. Meshkani
  • M. Ghoranneviss
  • A. Salar ElahiEmail author
  • M. Lafouti
Original Research


The first results of design and fabrication of comparative Langmuir Ball-Pen probe (LBP) for the IR-T1 tokamak were presented. Conventional Langmuir probe can’t measure the plasma potential precisely (due to temperature fluctuations). Therefore we used LBP for direct measurement of the plasma potential. First measurements show that the probe allows a modification of its collected electron and ion saturation currents. Regarding to the results, the ratio of R (up to down ion saturation currents) is close to one at a certain collector position (h = −0.7 mm). In this situation, the floating potential is very close to the plasma potential. Temporal and radial evolutions of plasma potential have been investigated and analyzed.


Tokamak Langmuir Ball-Pen Probe (LBP) Plasma potential 


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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • S. Meshkani
    • 1
  • M. Ghoranneviss
    • 1
  • A. Salar Elahi
    • 1
    Email author
  • M. Lafouti
    • 1
  1. 1.Plasma Physics Research Center, Science and Research BranchIslamic Azad UniversityTehranIran

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