Abstract
A poloidally oriented electrical probe array immersed into the plasma edge providing spatially and temporally resolved information of the plasma density and potential is used to study plasma edge turbulence at the CASTOR tokamak (R = 0.4 m, a = 0.085m). A model of ‘eddies’ formulated in [1] is experimentally proved by means of the mutual correlation between fluctuations of the plasma density and potential. Scans over principal plasma parameters (plasma current Ip, plasma density ne and toroidal magnetic field Bt) were performed and three different modes (three qualitatively different structures of fluctuations) were observed. The statistics of the fluctuation-induced flux were studied. A parameter virtually independent of the discharge conditions was found, its nature has not been explained yet.
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