Dependence of LTX plasma performance on surface conditions as determined by in situ analysis of plasma facing components

M. Lucia, R. Kaita, R. Majeski, F. Bedoya, J. P. Allain, T. Abrams, R. E. Bell, D. P. Boyle, M. A. Jaworski, J. C. Schmitt

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Abstract

Abstract The Materials Analysis and Particle Probe (MAPP) diagnostic has been implemented on the Lithium Tokamak Experiment (LTX) at PPPL, providing the first in situ X-ray photoelectron spectroscopy (XPS) surface characterization of tokamak plasma facing components (PFCs). MAPP samples were exposed to argon glow discharge conditioning (GDC), lithium evaporations, and hydrogen tokamak discharges inside LTX. Samples were analyzed with XPS, and alterations to surface conditions were correlated against observed LTX plasma performance changes. Argon GDC caused the accumulation of nm-scale metal oxide layers on the PFC surface, which appeared to bury surface carbon and oxygen contamination and thus improve plasma performance. Lithium evaporation led to the rapid formation of a lithium oxide (Li2O) surface; plasma performance was strongly improved for sufficiently thick evaporative coatings. Results indicate that a 5 h argon GDC or a 50 nm evaporative lithium coating will both significantly improve LTX plasma performance.

Original languageEnglish (US)
Article number48600
Pages (from-to)907-910
Number of pages4
JournalJournal of Nuclear Materials
Volume463
DOIs
StatePublished - Jul 22 2015

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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    Lucia, M., Kaita, R., Majeski, R., Bedoya, F., Allain, J. P., Abrams, T., Bell, R. E., Boyle, D. P., Jaworski, M. A., & Schmitt, J. C. (2015). Dependence of LTX plasma performance on surface conditions as determined by in situ analysis of plasma facing components. Journal of Nuclear Materials, 463, 907-910. [48600]. https://doi.org/10.1016/j.jnucmat.2014.11.006