Spatially resolved characterization of electrostatic fluctuations in the scrape-off layer of the CASTOR tokamak

P. Devynck, G. Bonhomme, E. Martines, J. Stöckel, G. Van Oost, I. Voitsekhovitch, J. Adámek, A. Azeroual, F. Doveil, I. Ďuran, E. Gravier, J. Gunn, M. Hron

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Abstract

The poloidal distribution of turbulence in the scrape-off layer (SOL) of the CASTOR tokamak is studied by means of a ring of 32 electric probes covering the whole perimeter of the poloidal cross section. Analysis of floating potential fluctuations in a SOL created in the top part of the machine by shifting the plasma downwards reveals a dominant periodic structure that propagates poloidally in the direction of the Er× B drift. Its poloidal mode number is found to be equal to the local safety factor q. Correlation and pulse propagation analyses show that this high m mode is a signature of a single long flute-like structure that is aligned with the magnetic field and snakes around the torus several times before terminating on the limiter.
Original languageEnglish
Pages (from-to)269 - 280
Number of pages12
JournalPlasma Physics and Controlled Fusion
Volume47
Issue number2
DOIs
Publication statusPublished - Feb 2005
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Devynck, P., Bonhomme, G., Martines, E., Stöckel, J., Van Oost, G., Voitsekhovitch, I., ... Hron, M. (2005). Spatially resolved characterization of electrostatic fluctuations in the scrape-off layer of the CASTOR tokamak. Plasma Physics and Controlled Fusion, 47(2), 269 - 280. https://doi.org/10.1088/0741-3335/47/2/005