TJ-II: Feed back control of Zonal Flows and turbulence in TJ-II: Difference between revisions

Stellarator devices have pioneered the detection of long-range correlations, consistent with the theory of zonal flows i.e., stable modes that are driven by turbulence and regulate turbulent transport, of interest in astrophysics, atmospheric dynamics and fusion plasmas. Recent results in the TJ-II stellarator indicate that both turbulent and neo-classical mechanisms, and their mutual interaction, should be considered to achieve a full understanding of the impact of radial electric fields on the mechanisms for the production and suppression of edge Zonal Flows <ref>R. Gerrú et al., NF 2019 </ref>. Therefore the radial electric field is a key ingredient to amplify the turbulent drive of zonal flows [i.e. symmetry breaking of turbulence] and the damping [i.e. influence on particle orbits].