Tokamaks and Other Magnetic Confinement Devices

Czechoslovak Journal of Physics

, Volume 54, Issue 3, pp C95-C99

A novel approach to direct measurement of the plasma potential

  • J. AdámekAffiliated withInstitute of Plasma Physics, Association EURATOM/IPP.CP
  • , J. StöckelAffiliated withInstitute of Plasma Physics, Association EURATOM/IPP.CP
  • , M. HronAffiliated withInstitute of Plasma Physics, Association EURATOM/IPP.CP
  • , J. RyszawyAffiliated withInstitute of Plasma Physics, Association EURATOM/IPP.CP
  • , M. TichýAffiliated withFaculty of Mathematics and Physics, Charles University
  • , R. SchrittwieserAffiliated withDepartment of Ion Physics, University of Innsbruck
  • , C. IonităAffiliated withDepartment of Ion Physics, University of Innsbruck
  • , P. BalanAffiliated withDepartment of Ion Physics, University of Innsbruck
  • , E. MartinesAffiliated withConsorzio RFX, Associatzione EURATOM-ENEA
    • , G. Van OostAffiliated withDepartment of Applied Physics, Ghent University

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Abstract

A novel probe and approach to the direct measurements of the plasma potential in a strong magnetic field is suggested. The principle of this method is to reduce the electron saturation current to the same magnitude as that of the ion saturation current. In this case, the floating potential of the probe becomes indentical to the plasma potential. This goal is attained by a shield, which screens off an adjustable part of the electron current from the probe collector due to the much smaller gyro-radius of the electrons. First systematic measurements have been perfomred in the CASTOR tokamak.

PACS

52.70.Ds

Key words

tokamak edge plasma plasma potential Langmuir probe