Comparison of H-Mode Plasmas Diverted to Solid and Liquid Lithium Surfaces [electronic resource]

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Book
Language
English
Published/​Created
Washington, D.C. : United States. Dept. of Energy. Office of Science ; Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2012
Description
1 online resource (Medium: ED) : digital, PDF file.

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Summary note
Experiments were conducted with a Liquid Lithium Divertor (LLD) in NSTX. Among the goals was to use lithium recoating to sustain deuterium (D) retention by a static liquid lithium surface, approximating the ability of flowing liquid lithium to maintain chemical reactivity. Lithium evaporators were used to deposit lithium on the LLD surface. Improvements in plasma edge conditions were similar to those with lithiated graphite plasma-facing components (PFCs), including an increase in confinement over discharges without lithiumcoated PFCs and ELM reduction during H-modes. With the outer strike point on the LLD, the D retention in the LLD was about the same as that for solid lithium coatings on graphite, or about two times that achieved without lithium PFC coatings. There were also indications of contamination of the LLD surface, possibly due erosion and redeposition of carbon from PFCs. Flowing lithium may thus be needed for chemically active PFCs during long-pulse operation.
Notes
  • Published through Scitech Connect.
  • 07/20/2012.
  • "PPPL-4786."
  • R Kaita, et al.
Funding information
DE-ACO2-09CH11466
Tech. report no.
PPPL-4786
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