In-situ studies of stainless steel exposed to hydrogen plasmas in the Lithium Tokamak Experiment (LTX)

POSTER

Abstract

The Materials Analysis Particle Probe (MAPP) is an in situ characterization device for diagnosing samples exposed to fusion reactor plasmas. X-ray photoelectron spectroscopy (XPS), ion scattering spectroscopy (ISS), thermal desorption spectroscopy (TDS) and direct recoil spectroscopy (DRS) will allow comprehensive shot-to-shot analysis of the samples. In the summer of 2013, MAPP was attached to a midplane port on LTX. The plasma-facing components (PFCs) in LTX are stainless steel, and MAPP enables evaluation of stainless steel samples before and after exposure to LTX plasmas. Initial studies compare XPS spectra from discharges with and without lithium PFC coatings. These results, combined with future measurements with TDS and ISS, provide unique insights into the relationship between the plasma behavior and the chemical structure of the first wall in fusion devices.

Authors

  • Felipe Bedoya

    Department of Nuclear, Plasma and Radiological Engineering, University of Illinois

  • Sean Gonderman

    Purdue University

  • Jean Paul Allain

    Purdue University, Department of Nuclear, Plasma and Radiological Engineering, University of Illinois and Purdue University

  • Robert Kaita

    PPPL, Princeton Plasma Physics Laboratory

  • Matthew Lucia

    PPPL, Princeton Plasma Physics Laboratory

  • Charles Skinner

    Princeton Plasma Physics Laboratory, P.P.P.L.

  • Robert Ellis

    Princeton Plasma Physics Laboratory

  • Lane Roquemore

    Princeton University, PPPL, PPPL, Princeton Plasma Physics Laboratory

  • Richard Majeski

    Princeton Plasma Physics Laboratory, PPPL, Princeton Plasma Physics Laboratary