Scraper Element Observations in the W7-X Stellarator

POSTER

Abstract

We report on plasma interactions with the new graphite scraper element in Module 5 of the Wendelstein 7-X stellarator during the recent OP1.2b campaign in 2018. Infrared and filtered visible imaging [1], spectroscopy, Langmuir probes and thermocouples provide a suite of measurements to compare a variety of plasma configurations, including a specially designed “high-beta mimic” configuration to put up to 10 MW/m^2 on the scraper element. Additionally, we looked for localized low-level hot spots with the new high-resolution IR capability, due to expected localized lost fast hydrogen ions injected from the new neutral beam injection (NBI) system.

[1] G. A. Wurden, et al, Rev. Sci. Instruments 2018

Presenters

  • Glen A. Wurden

    Los Alamos National Laboratory

Authors

  • Glen A. Wurden

    Los Alamos National Laboratory

  • Jeremy Lore

    Oak Ridge National Lab, Oak Ridge National Laboratory, IPP, ORNL

  • Victoria Winters

    U of Wisconsin, Madison, Univ of Wisconsin, Madison

  • Peter Drewelow

    Max Planck Institute for Plasma Physics, Max Planck Inst Plasmaphysik

  • Marcin Jakubowski

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

  • Kenneth Hammond

    Max Planck Institute for Plasma Physics, Max Planck Inst Plasmaphysik

  • Holger Niemann

    Max Planck Institute for Plasma Physics, Max Planck Inst Plasmaphysik, IPP, Max-Planck-Institut für Plasmaphysik

  • Joris Fellinger

    Max Planck Inst Plasmaphysik

  • Adnan Ali

    Max Planck Inst Plasmaphysik

  • Christoph Biedermann

    Max Planck Inst Plasmaphysik

  • Simppa Akaslompolo

    Max Planck Inst Plasmaphysik

  • Alexandra LeViness

    Princeton University, PPPL

  • and the Sunn W7X Team

    Max-Planck Institute for Plasma Physics, Greifswald, Max Planck Inst Plasmaphysik