Overview of first NBI fast ion results from W7-X

ORAL

Abstract

We present an overview of first fast ion experiments in the optimized stellarator Wendelstein 7-X (W7-X). The improved fast-ion behaviour is essential for applicability of stellarators as a fusion reactor and is one of the optimization criteria for the W7-X field geometry.

The neutral beam injection (NBI) system of the Wendelstein 7-X (W7-X) stellarator is commissioned during the 2018 experimental campaign. The NBI system consists of two boxes with two sources each. The four sources inject 55 keV hydrogen with approximately 1.7MW power, each. The injection geometry is quite radial and the two boxes produce stellarator-antisymmetric initial fast ion populations in phase space.

The confined fast ion population is measured with fast ion hydrogen alpha spectroscopy (FIDA) and ion cyclotron emissions probes (ICE) as well as via the excited MHD activity using magnetic pick-up coils. The lost fast ions are measured with a fast ion loss diagnostics probe (FILD) as well as monitored with infrared and visible light cameras viewing the plasma facing components.

*EUROfusion Consortium / Euratom research and training programme 2014-2018 via grant agreement No 633053. Walter Ahlström foundation.

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Presenters

  • Simppa Äkäslompolo

    • Max-Planck Institut für Plasmaphysik

Authors

  • Simppa Äkäslompolo

    • Max-Planck Institut für Plasmaphysik

  • Sergey Bozhenkov

    • Max-Planck-Institute for Plasma Physics, D-17491 Greifswald, Germany
    • Max-Planck Institut für Plasmaphysik
    • Max Planck Institute for Plasma Physics (IPP), 17491 Greifswald, Germany
    • Max-Planck-Institute for Plasma Physics, Greifswald, Germany

  • Yevgen Kazakov

    • ERM-KMS
    • Laboratory for Plasma Physics, LPP-ERM/KMS, Brussels, Belgium
    • LPP/ERM-KMS, Brussels

  • Samuel A Lazerson

    • Princeton Plasma Phys Lab
    • PPPL

  • Dirk Hartmann

    • Max-Planck Institut für Plasmaphysik

  • B. Geiger

    • Max-Planck Institut für Plasmaphysik
    • Max Planck Inst

  • Glen A Wurden

    • Los Alamos Natl Lab
    • LANL

  • Oliver Ford

    • Max-Planck Institut für Plasmaphysik
    • Max-Planck-Institute for Plasma Physics, Greifswald, Germany, Max-Planck-Institute for Plasma Physics, Greifswald, Germany
    • Max Planck Inst Plasmaphysik

  • Kunihiro Ogawa

    • National Institute for Fusion Science

  • Mitsutaka Isobe

    • National Institute for Fusion Science

  • Christoph Slaby

    • Max-Planck Institut für Plasmaphysik

  • Kian Rahbarnia

    • Max-Planck Institut für Plasmaphysik

  • Henning Thomsen

    • Max-Planck Institut für Plasmaphysik

  • Dmitry Moseev

    • Max-Planck Institut für Plasmaphysik
    • Max Planck Institute for Plasma Physics (IPP), 17491 Greifswald, Germany

  • Robert C Wolf

    • Max-Planck Institut für Plasmaphysik
    • Max Planck Institute for Plasma Physics (IPP), 17491 Greifswald, Germany
    • Max-Planck-Institute for Plasma Physics
    • Max-Planck-Institute for Plasma Physics, Greifswald, Germany

  • W7-X Team

    • Max-Planck Institut für Plasmaphysik
    • Max Planck Inst Plasmaphysik
    • IPP Greifswald