Plasma Physics Reports

, 35:980

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

  • J. Brotankova
  • J. Stockel
  • J. Horacek
  • J. Seidl
  • I. Duran
  • M. Hron
  • G. Van Oost
Small Fusion Devices

DOI: 10.1134/S1063780X09110087

Cite this article as:
Brotankova, J., Stockel, J., Horacek, J. et al. Plasma Phys. Rep. (2009) 35: 980. doi:10.1134/S1063780X09110087
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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 ωE × 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 Ufl and Isat.

Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  • J. Brotankova
    • 1
    • 2
  • J. Stockel
    • 1
  • J. Horacek
    • 2
  • J. Seidl
    • 1
  • I. Duran
    • 1
  • M. Hron
    • 1
  • G. Van Oost
    • 3
  1. 1.Institute of Plasma Physics AS CR, v.v.i.Association EURATOM/IPP.CRPraha 8Czech Republic
  2. 2.Faculty of Mathematics and PhysicsCharles University in PraguePrahaCzech Republic
  3. 3.Department of Applied PhysicsGhent UniversityGentBelgium