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A PROBE-BASED METHOD FOR MEASURING THE TRANSPORT COEFFICIENT IN THE TOKAMAK EDGE REGION
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SYSNO ASEP 0050589 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title A PROBE-BASED METHOD FOR MEASURING THE TRANSPORT COEFFICIENT IN THE TOKAMAK EDGE REGION Title Nová sondová metoda pro měření transportního koeficientu v okrajovém plazmatu tokamaku Author(s) Brotánková, Jana (UFP-V)
Martines, E. (IT)
Adámek, Jiří (UFP-V) RID, ORCID
Popa, G. (RO)
Costin, C. (RO)
Schrittwieser, R. (AT)
Ionita, C. (AT)
Stöckel, Jan (UFP-V) RID
Van Oost, G. (BE)
van de Peppel, L. (NL)Source Title Czechoslovak Journal of Physics. - : Springer - ISSN 0011-4626
Roč. 56, č. 12 (2006), s. 1321-1327Number of pages 7 s. Action Workshop on the Electric Field, Structures, and Relaxation in Edge Plasma/9th./ Event date 26.6.2006-27.6.2006 VEvent location Řím Country IT - Italy Event type WRD Language eng - English Country CZ - Czech Republic Keywords probe measurements ; plasma edge ; diffusion Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects KJB100430601 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z20430508 - UFP-V (2005-2011) Annotation A new method for measuring the diffusion coefficient in the edge plasma of fusion devices is presented. The method is based on studying the decay of the plasma fluctuation spectrum inside a small ceramic tube having its mouth flush with a magnetic surface and its axis aligned along the radial direction. The plasma fluctuations are detected by an electrode, radially movable inside the tube. In the experiment described herein, which was performed in the edge region of the CASTOR tokamak, the electrode measured the floating potential. The experimental arrangement is the same used for the direct plasma potential measurements according to the “Ball-pen probe”, which design is based on the Katsumata probe principle. When the electrode protrudes from the tube, the measured signal shows the floating potential fluctuations of the plasma. Retracting the electrode into the tube, the signal power spectrum displays a decay. This decay is different for different frequencies, and is exponenti. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2007
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