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The goal of this investigation is to study the level of velocity fluctuations in different scenarios of the TJ‐II stellarator. The method consists in measuring the apparent Doppler temperature of C 4+  and protons with high spectral resolution techniques with spatial resolution. The level of turbulent velocities has been deduced from the difference observed between the apparent temperature of both species, following a method previously presented. The study of this difference, as a function of plasma density and injected power, provides a way to explore if this turbulence plays any role in the confinement of the hot TJ‐II plasma (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

The Level of Non‐Thermal Velocity Fluctuations Deduced From Doppler Spectroscopy and their Role on TJ‐II Confinement