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The radial profile of Reynolds stress has been measured in the plasma boundary region of the ISTTOK tokamak using a multiarray of Langmuir probes. The electrostatic Reynolds stress component, proportional to the cross correlation of radial and poloidal fluctuating electric fields, shows a radial gradient close to the velocity shear layer location. It is shown that this mechanism may drive significant poloidal flows in the plasma boundary region.
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Hidalgo et al. (1999) studied this question.
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