Czechoslovak Journal of Physics

, Volume 55, Issue 3, pp 235–242

Comparative measurements of the plasma potential with the ball-pen and emissive probes on the CASTOR tokamak

  • J. Adámek
  • J. Stöckel
  • I. Ďuran
  • M. Hron
  • R. Pánek
  • M. Tichý
  • R. Schrittwieser
  • C. Ionit
  • P. Balan
  • E. Martines
  • G. Van Oost
Article

Abstract

A novel approach to the direct measurement of the plasma potential in magnetized plasmas, using the so-called “ball-pen probe”, was recently tested in the CASTOR tokamak. Comparison with the standard technique of plasma potential measurement using the emissive probe is reported. It is found that the plasma potential determined by the emissive probe is systematically lower than that measured by the ball-pen probe. The difference is of the of the of kTe/e. A possible reason of this difference is the space charge occurring in the proximity of the emissive probe.

Key words

tokamak edge plasma plasma potential Langmuir probe 

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Copyright information

© Institute of Physics, Academy of Sciences of Czech Republic 2005

Authors and Affiliations

  • J. Adámek
    • 1
  • J. Stöckel
    • 1
  • I. Ďuran
    • 1
  • M. Hron
    • 1
  • R. Pánek
    • 1
  • M. Tichý
    • 2
  • R. Schrittwieser
    • 3
  • C. Ionit
    • 3
  • P. Balan
    • 3
  • E. Martines
    • 4
  • G. Van Oost
    • 5
  1. 1.Institute of Plasma PhysicsAssociation EURATOM/IPP.CRPragueCzech Republic
  2. 2.Faculty of Mathematics and PhysicsCharles UniversityPragueCzech Republic
  3. 3.Department of Ion PhysicsUniversity of InnsbruckInnsbruckAustria
  4. 4.Consorzio RFX, Associazione EURATOM-ENEA sulla FusionePadovaItaly
  5. 5.Department of Applied PhysicsGhent UniversityGentBelgium

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