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Advances in boronization on NSTX-Upgrade

Author(s): Skinner, C.H.; Bedoya, F.; Scotti, F.; Allain, J.P.; Blanchard, W.; et al

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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.
Publication Date: 2017
Electronic Publication Date: 27-Jul-2017
Citation: 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, 12 (744 - 748). doi:10.1016/j.nme.2016.11.024
DOI: doi:10.1016/j.nme.2016.11.024
Pages: 744 - 748
Type of Material: Journal Article
Journal/Proceeding Title: Nuclear Materials and Energy
Version: Final published version. This is an open access article.

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