Oxidation of lithium plasma facing components and its effect on plasma performance in the lithium tokamak experiment-β

A. Maan, D. P. Boyle, R. Kaita, E. T. Ostrowski, D. C. Donovan, R. P. Majeski, B. E. Koel, T. M. Biewer, P. E. Hughes, C. Hansen, S. Kubota, V. Soukhanovskii

Research output: Contribution to journalArticlepeer-review

Abstract

The characteristics of lithium-coated plasma-facing components (PFCs) have been correlated with plasma performance on the lithium tokamak experiment-β (LTX-β). Previous experiments on LTX showed that the application of lithium to PFCs was needed to achieve higher performance discharges with flat electron temperature profiles and high edge temperatures. Samples that match the LTX-β PFCs were exposed to plasmas before and after PFCs were coated with lithium and transferred under vacuum to a surface analysis station. Measurements using x-ray photoelectron spectroscopy (XPS) revealed that the primary surface constituent was lithium oxide. Earlier XPS analysis of lithium-coated PFCs on LTX was only able to show the presence of surface oxygen. The new XPS data from LTX-β have sufficient resolution to clearly identify lithium compounds for the first time, and enable them to be correlated with how lithium-coated PFCs can reduce impurities and retain hydrogen to reduce recycling.

Original languageEnglish (US)
Article number025007
JournalPlasma Physics and Controlled Fusion
Volume63
Issue number2
DOIs
StatePublished - Dec 16 2021

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Keywords

  • Lithium
  • Plasma confinement
  • Plasma diagnostics
  • Plasma surface interactions
  • Tokamaks

Fingerprint Dive into the research topics of 'Oxidation of lithium plasma facing components and its effect on plasma performance in the lithium tokamak experiment-β'. Together they form a unique fingerprint.

Cite this