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.

doi:10.1016/j.nme.2016.11.024

Advances in boronization on NSTX-Upgrade

Journal Article · Thu Jan 26 23:00:00 EST 2017 · Nuclear Materials and Energy

DOI:https://doi.org/10.1016/j.nme.2016.11.024· OSTI ID:1349239

Skinner, C. H. ^[1]; Bedoya, F. ^[2]; Scotti, F. ^[3]; Allain, J. P. ^[2]; Blanchard, W. ^[1]; Cai, D. ^[1]; Jaworski, M. ^[1]; Koel, B. E. ^[4]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
University of Illinois at Urbana-Champaign, IL (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Princeton University, NJ (United States)

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. Furthermore, this increase correlated with the rise of oxygen emission from the plasma.

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC02-09CH11466; AC52-07NA27344

OSTI ID:: 1349239

Alternate ID(s):: OSTI ID: 1888628

Report Number(s):: LLNL-JRNL-840086; PII: S2352179116301028

Journal Information:: Nuclear Materials and Energy, Journal Name: Nuclear Materials and Energy Journal Issue: C Vol. 12; ISSN 2352-1791

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (4)

Unraveling the surface chemistry processes in lithiated and boronized plasma material interfaces under extreme conditions Krstic, P. S.; Allain, J. P.; Dominguez-Gutierrez, F. J. Matter and Radiation at Extremes, Vol. 3, Issue 4 https://doi.org/10.1016/j.mre.2018.03.003	journal	July 2018
Effect of deuterium irradiation on graphite boronized in the NSTX-U tokamak Bedoya, F.; Allain, J. P.; Dominguez-Gutierrez, F. J. Scientific Reports, Vol. 9, Issue 1 https://doi.org/10.1038/s41598-019-38941-9	journal	February 2019
Deuterium uptake and sputtering of simultaneous lithiated, boronized, and oxidized carbon surfaces irradiated by low-energy deuterium Domínguez-Gutiérrez, F. J.; Krstić, P. S.; Allain, J. P. Journal of Applied Physics, Vol. 123, Issue 19 https://doi.org/10.1063/1.5026415	journal	May 2018
Scenario development during commissioning operations on the National Spherical Torus Experiment Upgrade Battaglia, D. J.; Boyer, M. D.; Gerhardt, S. Nuclear Fusion, Vol. 58, Issue 4 https://doi.org/10.1088/1741-4326/aaa6e0	journal	February 2018

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