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TJ-II: Influence of Alfven Eigenmodes in edge turbulence and Zonal Flows: Difference between revisions
TJ-II: Influence of Alfven Eigenmodes in edge turbulence and Zonal Flows (view source)
Revision as of 20:30, 9 January 2021
, 9 January 2021→Description of the activity
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The unique TJ-II experimental set-up using a dual HIBP has shown that, in some conditions, long range correlations (LRC) are detected both at the AE frequencies and low frequencies (< 10 kHz). LRC are observed in plasma potential fluctuations but not in density fluctuations as expected in zonal flow structures <ref>C. Hidalgo et al., 28th IAEA Conf., Nice 2021</ref>. Recent experiments have shown clear evidence non-linear coupling between Alfven modes and broadband turbulence as well as some hints of coupling between low frequency Zonal Flows and broad-band turbulence using edge probes measurements <ref>Filip Papoušek et al., Physics Meeting December 14th (2020)</ref>. These results were obtained in plasma regimes with steady-state AEs activity in a time scale of about six energy confinement times. | The unique TJ-II experimental set-up using a dual HIBP has shown that, in some conditions, long range correlations (LRC) are detected both at the AE frequencies and low frequencies (< 10 kHz). LRC are observed in plasma potential fluctuations but not in density fluctuations as expected in zonal flow structures <ref>C. Hidalgo et al., 28th IAEA Conf., Nice 2021</ref>. Recent experiments have shown clear evidence non-linear coupling between Alfven modes and broadband turbulence as well as some hints of coupling between low frequency Zonal Flows and broad-band turbulence using edge probes measurements <ref>Filip Papoušek et al., Physics Meeting December 14th (2020)</ref>. These results were obtained in plasma regimes with steady-state AEs activity in a time scale of about six energy confinement times. | ||
The goal of this proposal is to address the following questions: may fast particles driven by NBI interact with global structures in the plasma (zonal flows) and | The goal of this proposal is to address the following questions: may fast particles driven by NBI interact with global structures in the plasma (zonal flows) and turbulence?. With this goal, the strategy of the TJ-II experimental program would be: | ||
1. Investigation of AEs localized in the edge region by means of edge probes and HIBP [reference shot 43706] and AEs identification. | 1. Investigation of AEs localized in the edge region by means of edge probes and HIBP [reference shot 43706] and AEs identification. | ||