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

TJ-II: Feed back control of Zonal Flows and turbulence in TJ-II (view source)

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 == Description of the activity ==
-Enter description here <ref>A. Einstein, Journal of Exceptional Results (2017)</ref>, including motivation/objectives and experience of the proponent (typically one-two pages)
 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>A. Einstein, Journal of Exceptional Results (2017)</ref>. Therefore the radial electric field is a key ingredient to amplify the turbulent drive of zonal flows [via Er inducced symmetry breaking of turbulence] and the damping [via the Er influence on particle orbits].
+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].
-The goal of this proposal is to explore the feasibility of active control of dynamical Zonal Flows by active feed-back experiments using biasing inducced Er as external actuator and the amplitude of low frequency ZFs as sensor.
+The goal of this proposal is to explore the feasibility of active control of dynamical Zonal Flows by active feed-back experiments using biasing induced electric fields as external actuator and the amplitude of low frequency ZFs as sensor.
 == International or National funding project or entity ==