Comparison of H-Mode Plasmas Diverted to Solid and Liquid Lithium Surfaces

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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 ... continued below

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R. Kaita, et. al. July 20, 2012.

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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.

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  • Presented at: 20th International Conference on Plasma Surface Interactions 2012, Aachen, Germany (May 21-25, 2012)
  • Journal of Nuclear Materials (May 2012)

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  • Report No.: PPPL-4786
  • Grant Number: DE-ACO2-09CH11466
  • Office of Scientific & Technical Information Report Number: 1056828
  • Archival Resource Key: ark:/67531/metadc845367

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  • July 20, 2012

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  • May 19, 2016, 9:45 a.m.

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  • July 18, 2016, 5:25 p.m.

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R. Kaita, et. al. Comparison of H-Mode Plasmas Diverted to Solid and Liquid Lithium Surfaces, article, July 20, 2012; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc845367/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.