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The spatio-temporal evolution of turbulence and plasma flows has been studied experimentally by means of Doppler reflectometry during the back-transition from the high to low confinement mode in the TJ-II stellarator. Signatures of spatial spreading of the turbulence are found inside the radial position of the sheared E × B flow as the H–L back-transition is approached. The results point to the possible role of radial spreading of turbulence in determining the width of transport barriers.
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Estrada et al. (2011) studied this question.
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