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Title: Advances in boronization on NSTX-Upgrade

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

Authors:
 [1];  [2];  [3];  [2];  [1];  [1];  [1];  [4]
+ Show Author Affiliations
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. University of Illinois at Urbana-Champaign, IL (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Princeton University, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1349239
Alternate Identifier(s):
OSTI ID: 1888628
Report Number(s):
LLNL-JRNL-840086
Journal ID: ISSN 2352-1791; PII: S2352179116301028; TRN: US1800092
Grant/Contract Number:  
AC02-09CH11466; AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Materials and Energy
Additional Journal Information:
Journal Volume: 12; Journal Issue: C; Related Information: The digital data for this paper can be found in http://arks.princeton.edu/ark:/88435/dsp018s45qc26p.; Journal ID: ISSN 2352-1791
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Boronization; Deuterated tri-methyl boron; NSTX-U; Plasma-materials interaction; Surface analysis; boronization; deuterated tri-methyl boron; plasma-materials interaction; surface analysis

Citation Formats

Skinner, C. H., Bedoya, F., Scotti, F., Allain, J. P., Blanchard, W., Cai, D., Jaworski, M., and Koel, B. E. Advances in boronization on NSTX-Upgrade. United States: N. p., 2017. Web. doi:10.1016/j.nme.2016.11.024.
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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. United States. https://doi.org/10.1016/j.nme.2016.11.024
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Skinner, C. H., Bedoya, F., Scotti, F., Allain, J. P., Blanchard, W., Cai, D., Jaworski, M., and Koel, B. E. Fri . "Advances in boronization on NSTX-Upgrade". United States. https://doi.org/10.1016/j.nme.2016.11.024. https://www.osti.gov/servlets/purl/1349239.
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@article{osti_1349239,
title = {Advances in boronization on NSTX-Upgrade},
author = {Skinner, C. H. and Bedoya, F. and Scotti, F. and Allain, J. P. and Blanchard, W. and Cai, D. and Jaworski, M. and Koel, B. E.},
abstractNote = {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.},
doi = {10.1016/j.nme.2016.11.024},
journal = {Nuclear Materials and Energy},
number = C,
volume = 12,
place = {United States},
year = {Fri Jan 27 00:00:00 EST 2017},
month = {Fri Jan 27 00:00:00 EST 2017}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1016/j.nme.2016.11.024
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