Filterscope edge plasma diagnostic for the W7-X stellarator

POSTER

Abstract

W7-X is a large (R $=$ 5.5m, a $=$ 0.5m, B \textless 3T, P\textgreater 10 MW) superconducting stellarator at the Max-Planck Institut f\"{u}r Plasmaphysik in Greifswald, Germany, which will begin plasma operations in the last quarter of 2015. We describe here the first measurements with a 24-channel filterscope diagnostic [E. A. Unterberg, et al, Rev. Sci. Instrum. 83, 10D722, (2012)] of edge plasma characteristics and spectral emission from impurities near the test limiters installed for initial plasma experiments. These measurements, together with high resolution IR thermography imaging of the limiter, will be used as inputs for edge transport modeling using the EMC3 code [J. D. Lore, et al, Nucl. Fusion 52, 0540 (2012)].

*This work is sponsored by DOE Contract No. DE-AC05- 00OR22725 with UT-Battelle.

Authors

  • Jeffrey Harris

    • Oak Ridge National Laboratory

  • Ezekial Unterberg

    • Oak Ridge National Laboratory

  • Jeremy Lore

    • Oak Ridge National Laboratory

  • Laurie Stephey

    • University of Wisconsin-Madison

  • Oliver Schmitz

    • University of Wisconsin-Madison

  • Glen Wurden

    • Los Alamos National Laboratory

  • Christoph Biedermann

    • Max-Planck Institut f\"ur Plasmaphysik

  • Maciej Krychowiak

    • Max-Planck Institut f\"ur Plasmaphysik

  • Ralf Koenig

    • Max-Planck Institut f\"ur Plasmaphysik