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Edge Turbulence Analysis by Means of Electrical Probes on Tokamak CASTOR
Author(s) -
Petrzilka J.,
Stöckel J.
Publication year - 1998
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.19980380116
Subject(s) - tokamak , plasma , turbulence , physics , plasma parameters , toroid , atomic physics , magnetic field , plasma parameter , electric field , enhanced data rates for gsm evolution , computational physics , mechanics , nuclear physics , quantum mechanics , telecommunications , computer science
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 = 0.085 m ). 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 I p , plasma density n e and toroidal magnetic field B t ) 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.