Small Fusion Devices

Plasma Physics Reports

, 35:980

First online:

Measurement of sheared flows in the edge plasma of the CASTOR tokamak

  • J. BrotankovaAffiliated withInstitute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CRFaculty of Mathematics and Physics, Charles University in Prague
  • , J. StockelAffiliated withInstitute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR
  • , J. HoracekAffiliated withFaculty of Mathematics and Physics, Charles University in Prague
  • , J. SeidlAffiliated withInstitute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR
  • , I. DuranAffiliated withInstitute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR
  • , M. HronAffiliated withInstitute of Plasma Physics AS CR, v.v.i., Association EURATOM/IPP.CR
  • , G. Van OostAffiliated withDepartment of Applied Physics, Ghent University

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Abstract

The ion saturation current and floating potential are measured with high temporal (1 µs) and spatial (2.5 mm) resolutions at the plasma edge of the CASTOR tokamak by two poloidally spaced radial arrays of Langmuir probes. The radial electric field and the phase velocity of plasma fluctuations are estimated. The position of the velocity shear layer (VSL) is localized with a high precision. The shearing rate ω E × B determined and found to be comparable with the inverse of the correlation time of fluctuations 1/τac outside the VSL and about five times higher in the proximity of the VSL. A small impact of the shear on fluctuation level at the VSL is observed also in the statistic parameters of the U fl and I sat.