Turbulence measurements with a correlation ECE diagnostic in negative triangularity plasmas at ASDEX Upgrade

ORAL

Abstract

Negative triangularity plasmas, in the absence of a transport barrier, show a reduction of fluctuation levels and improved confinement. Relative fluctuation levels are reported to be reduced in experiments [1,3], and modeling [2]. At ASDEX Upgrade, the negative δ scenario with 600 kA plasma current is established, and unfavorable configuration is identified as an essential ingredient in avoiding H-mode operation [4].

This work analyzes the first measurements of the electron temperature fluctuations (δTe) from the recent 2022 experimental campaign where an extended plasma current of 800 kA is achieved. The δTe levels are measured with a correlation ECE diagnostic and compared for different ▽Te in favorable and unfavorable drift configurations.

[1] M. Fontana, et al., Nucl. Fusion 58 024002 (2018)

[2] G. Merlo, et al., Plasma Phys. Control. Fusion 63 044001 (2021)

[3] M. E. Austin, et al., Phys. Rev. Lett. 122, 115001 (2019)

[4] T. Happel, et al., submitted to NF

*This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200 — EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them.This work is supported by US DoE Award DE SC0014264.

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Presenters

  • Branka Vanovac

    • MIT
    • Massachusetts Institute of Technology MIT

Authors

  • Branka Vanovac

    • MIT
    • Massachusetts Institute of Technology MIT

  • Joerg Hobirk

    • Max Plank Institute for Plasma Physics, 85748 Garching, Germany
    • Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany
    • Max-Planck-Institut für Plasmaphysik, Garching, Germany

  • Thomas Pütterich

    • Max Plank Institute for Plasma Physics, 85748 Garching, Germany
    • Max Planck Institute for Plasma Physics, Garching

  • Rachel Bielajew

    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology MIT

  • Pablo Rodriguez-Fernandez

    • MIT Plasma Science and Fusion Center
    • MIT

  • Christian Yoo

    • Massachusetts Institute of Technology MIT

  • Garrard D Conway

    • Max Planck Institute for Plasma Physics

  • Anne E White

    • MIT PSFC
    • Massachusetts Institute of Technology MI
    • Massachusetts Institute of Technology MIT

  • Tommaso Bolzonella

    • Consorzio RFX, Corso Stati Uniti 4, 35127 Padova, Italy

  • Francesco Sciortino

    • IPP-Garching
    • Max-Planck-Institut für Plasmaphysik
    • 4. Max-Plank-Institut für Plasmaphysik
    • Max-Planck-Institute for Plasma Physics
    • Max Plank Institute for Plasma Physics, 85748 Garching, Germany}
    • Max Planck Institute of Plasma Physics
    • IPP Garching

  • Tim Happel

    • Max Planck Institute for Plasma Physics