Advances in boronization on NSTX-Upgrade

C. H. Skinner, F. Bedoya, F. Scotti, J. P. Allain, W. Blanchard, D. Cai, M. Jaworski, B. E. Koel

Research output: Research - peer-reviewArticle

Abstract

Boronization has been effective in reducing plasma impurities and enabling access to higher density, higher confinement plasmas in many magnetic fusion devices. The National Spherical Torus eXperiment, NSTX, has recently undergone a major upgrade to NSTX-U in order to develop the physics basis for a ST-based Fusion Nuclear Science Facility (FNSF) with capability for double the toroidal field, plasma current, and NBI heating power and increased pulse duration from 1–1.5 s to 5–8 s. A new deuterated tri-methyl boron conditioning system was implemented together with a novel surface analysis diagnostic. We report on the spatial distribution of the boron deposition versus discharge pressure, gas injection and electrode location. The oxygen concentration of the plasma facing surface was measured by in-vacuo XPS and increased both with plasma exposure and with exposure to trace residual gases. This increase correlated with the rise of oxygen emission from the plasma.

LanguageEnglish (US)
Pages744-748
Number of pages5
JournalNuclear Materials and Energy
Volume12
DOIs
StatePublished - Aug 1 2017

Fingerprint

Plasmas
boron
oxygen
Boron
Fusion reactions
Oxygen
gas injection
plasma control
residual gas
plasma currents
conditioning
nuclear fusion
spatial distribution
pulse duration
fusion
impurities
physics
heating
electrodes
Plasma confinement

Keywords

  • Boronization
  • Deuterated tri-methyl boron
  • NSTX-U
  • Plasma-materials interaction
  • Surface analysis

ASJC Scopus subject areas

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

Cite this

Skinner, C. H., Bedoya, F., Scotti, F., Allain, J. P., Blanchard, W., Cai, D., ... Koel, B. E. (2017). Advances in boronization on NSTX-Upgrade. Nuclear Materials and Energy, 12, 744-748. DOI: 10.1016/j.nme.2016.11.024

Advances in boronization on NSTX-Upgrade. / Skinner, C. H.; Bedoya, F.; Scotti, F.; Allain, J. P.; Blanchard, W.; Cai, D.; Jaworski, M.; Koel, B. E.

In: Nuclear Materials and Energy, Vol. 12, 01.08.2017, p. 744-748.

Research output: Research - peer-reviewArticle

Skinner, CH, Bedoya, F, Scotti, F, Allain, JP, Blanchard, W, Cai, D, Jaworski, M & Koel, BE 2017, 'Advances in boronization on NSTX-Upgrade' Nuclear Materials and Energy, vol 12, pp. 744-748. DOI: 10.1016/j.nme.2016.11.024
Skinner CH, Bedoya F, Scotti F, Allain JP, Blanchard W, Cai D et al. Advances in boronization on NSTX-Upgrade. Nuclear Materials and Energy. 2017 Aug 1;12:744-748. Available from, DOI: 10.1016/j.nme.2016.11.024
Skinner, C. H. ; Bedoya, F. ; Scotti, F. ; Allain, J. P. ; Blanchard, W. ; Cai, D. ; Jaworski, M. ; Koel, B. E./ Advances in boronization on NSTX-Upgrade. In: Nuclear Materials and Energy. 2017 ; Vol. 12. pp. 744-748
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