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

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    0029745 - ÚFP 2006 RIV GB eng J - Journal Article
    Devynck, P. - Bonhomme, G. - Martines, E. - Stöckel, Jan - Van Oost, G. - Voitsekhovitch, I. - Adámek, Jiří - Azeroual, A. - Doveil, F. - Ďuran, Ivan - Gravier, E. - Gunn, J. - Hron, Martin
    Spatially resolved characterization of electrostatic fluctuations in the scrape-off layer of the CASTOR tokamak.
    [Charakterizace elektrostatické turbulence v okrajové oblasti tokamaku CASTOR s prostorovým rozlišením.]
    Plasma Physics and Controlled Fusion. Roč. 47, č. 2 (2005), s. 269-280. ISSN 0741-3335. E-ISSN 1361-6587
    R&D Projects: GA ČR GA202/03/0786
    Grant - others:GA - INTAS 2001 2056
    Institutional research plan: CEZ:AV0Z20430508
    Keywords : tokamak * plasma * turbulence
    Subject RIV: BL - Plasma and Gas Discharge Physics
    Impact factor: 2.902, year: 2005

    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.

    Charakter turbulence v okrajovém plazmatu tokamaku CASTOR byl studován za pomocí 32 elektrických sond, které zajišťovaly měření po celém obvodu poloidálního průřezu plazmatu. Analýza fluktuací plovoucího potenciálu ukázala vznik periodické struktury, která se šířila poloidálně v souhlasu s driftem ExB a jejíž poloidální mód byl roven lokální hodnotě bezpečnostního faktoru.
    Permanent Link: http://hdl.handle.net/11104/0119549

     
     
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