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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)
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Alexander Kozachez and the HIBP Kharkov team | Alexander Kozachez and the HIBP Kharkov team | ||
Jacobo Varela / UC3M | Jacobo Varela / UC3M | ||
David Zarzoso and Samuel Mazzi / Aix Marseille University | |||
== Details of contact person at LNF == | == Details of contact person at LNF == | ||
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Fast ions have been found to impact plasma confinement. While most of previous research have been focussed on the excitation and impact of fast ions modes in plasma performance, because of the drain of energy related to fast particle losses with a concomitant potential damages in the plasma facing components, there is a growing interest on the impact on fast particles on plasma turbulence and self-organization phenomena <ref>A. Di Siena et al « Electromagnetic turbulence suppression by energetic particle driven modes” 2019 Nucl. Fusion 59 124001</ref> <ref>S. Mazzi, et al. Towards enhanced performance in fusion plasmas via turbulence suppression by MeV ions, submitted to Nature Physics</ref>. | Fast ions have been found to impact plasma confinement. While most of previous research have been focussed on the excitation and impact of fast ions modes in plasma performance, because of the drain of energy related to fast particle losses with a concomitant potential damages in the plasma facing components, there is a growing interest on the impact on fast particles on plasma turbulence and self-organization phenomena <ref>A. Di Siena et al « Electromagnetic turbulence suppression by energetic particle driven modes” 2019 Nucl. Fusion 59 124001</ref> <ref>S. Mazzi, et al. Towards enhanced performance in fusion plasmas via turbulence suppression by MeV ions, submitted to Nature Physics</ref>. | ||
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 using edge probes 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. | ||
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3. Non-linear coupling studies of AEs, turbulence and ZFs. | 3. Non-linear coupling studies of AEs, turbulence and ZFs. | ||
4. Influence of radial electric fields (using edge biasing) on LRC, AEs and ExB turbulent transport. | |||
== International or National funding project or entity == | == International or National funding project or entity == | ||
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[[Category:TJ-II internal documents]] | [[Category:TJ-II internal documents]] | ||
[[Category:TJ-II experimental proposals 2021]] | [[Category:TJ-II experimental proposals Spring 2021]] | ||