Addressing the challenges of plasma-surface interactions in NSTX-U

R. Kaita, T. Abrams, M. Jaworski, M. Lucia, J. Nichols, C. H. Skinner, D. Stotler, J. P. Alain, F. Bedoya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The importance of conditioning plasma-facing components (PFCs) has long been recognized as a critical element in obtaining high-performance plasmas in magnetic confinement devices. Lithium coatings, for example, have been used for decades for conditioning PFCs. Since the initial studies on the Tokamak Fusion Test Reactor, experiments on devices with different aspect ratios and magnetic geometries like the National Spherical Torus Experiment (NSTX) continue to show the relationship between lithium PFCs and good confinement and stability. While such results are promising, their empirical nature do not reflect the detailed relationship between PFCs and the dynamic conditions that occur in the tokamak environment. A first step developing an understanding such complexity will be taken in the upgrade to NSTX (NSTX-U) that is nearing completion. New measurement capabilities include the Materials Analysis and Particle Probe (MAPP) for in situ surface analysis of samples exposed to tokamak plasmas. The OEDGE suite of codes, for example, will provide a new way to model the underlying mechanisms for such material migration in NSTX-U. This will lead to a better understanding of how plasma-facing surfaces evolve during a shot, and how the composition of the plasma facing surface influences the discharge performance we observe. This paper will provide an overview of these capabilities, and highlight their importance for NSTX-U plans to transition from carbon to high-Z PFCs.

Original languageEnglish (US)
Title of host publicationICOPS/BEAMS 2014 - 41st IEEE International Conference on Plasma Science and the 20th International Conference on High-Power Particle Beams
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479927111
DOIs
StatePublished - Jan 16 2015
Event41st IEEE International Conference on Plasma Science, ICOPS 2014 and the 20th IEEE International Conference on High-Power Particle Beams, BEAMS 2014 - Washington, United States
Duration: May 25 2014May 29 2014

Publication series

NameICOPS/BEAMS 2014 - 41st IEEE International Conference on Plasma Science and the 20th International Conference on High-Power Particle Beams

Other

Other41st IEEE International Conference on Plasma Science, ICOPS 2014 and the 20th IEEE International Conference on High-Power Particle Beams, BEAMS 2014
CountryUnited States
CityWashington
Period5/25/145/29/14

Keywords

  • fusion rector materials
  • plasma-facing components
  • plasma-surface interactions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Kaita, R., Abrams, T., Jaworski, M., Lucia, M., Nichols, J., Skinner, C. H., Stotler, D., Alain, J. P., & Bedoya, F. (2015). Addressing the challenges of plasma-surface interactions in NSTX-U. In ICOPS/BEAMS 2014 - 41st IEEE International Conference on Plasma Science and the 20th International Conference on High-Power Particle Beams [7012742] (ICOPS/BEAMS 2014 - 41st IEEE International Conference on Plasma Science and the 20th International Conference on High-Power Particle Beams). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PLASMA.2014.7012742