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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

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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