Unraveling the plasma-material interface with real time diagnosis of dynamic boron conditioning in extreme tokamak plasmas

F. Javier Dominguez-Gutiérrez, Felipe Bedoya, Predrag S. Krstić, Jean P. Allain, Stephan Irle, Charles H. Skinner, Robert Kaita, Bruce Koel

Research output: Contribution to journalArticle

Abstract

We present a study of the role of boron and oxygen in the chemistry of deuterium retention in boronized ATJ graphite irradiated by the extreme environment of a tokamak deuterium plasma. The experimental results were obtained by the first XPS measurements inside the plasma chamber of the National Spherical Torus Experiment Upgrade, between the plasma exposures. The subtle interplay of boron, carbon, oxygen and deuterium chemistry is explained by reactive molecular dynamics simulations, verified by quantum-classical molecular dynamics and successfully compared to the measured data. The calculations deciphered the roles of oxygen and boron for the deuterium retention and predict deuterium uptake into a boronized carbon surface close in value to that previously predicted for a lithiated and oxidized carbon surface.

Original languageEnglish (US)
Article number086050
JournalNuclear Fusion
Volume57
Issue number8
DOIs
StatePublished - Jul 21 2017

Keywords

  • NSTX-U
  • boronization
  • deuterium retention
  • plasma-surface interactions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Unraveling the plasma-material interface with real time diagnosis of dynamic boron conditioning in extreme tokamak plasmas'. Together they form a unique fingerprint.

  • Cite this

    Dominguez-Gutiérrez, F. J., Bedoya, F., Krstić, P. S., Allain, J. P., Irle, S., Skinner, C. H., Kaita, R., & Koel, B. (2017). Unraveling the plasma-material interface with real time diagnosis of dynamic boron conditioning in extreme tokamak plasmas. Nuclear Fusion, 57(8), [086050]. https://doi.org/10.1088/1741-4326/aa7b17