Lithium Surface Coatings for Improved Plasma Performance in NSTX

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NSTX high-power divertor plasma experiments have shown, for the first time, significant and frequent benefits from lithium coatings applied to plasma facing components. Lithium pellet injection on NSTX introduced lithium pellets with masses 1 to 5 mg via He discharges. Lithium coatings have also been applied with an oven that directed a collimated stream of lithium vapor toward the graphite tiles of the lower center stack and divertor. Lithium depositions from a few mg to 1 g have been applied between discharges. Benefits from the lithium coating were sometimes, but not always seen. These improvements sometimes included decreases plasma density, ... continued below

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Kugel, H W; Ahn, J -W; Allain, J P; Bell, R; Boedo, J; Bush, C et al. February 19, 2008.

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NSTX high-power divertor plasma experiments have shown, for the first time, significant and frequent benefits from lithium coatings applied to plasma facing components. Lithium pellet injection on NSTX introduced lithium pellets with masses 1 to 5 mg via He discharges. Lithium coatings have also been applied with an oven that directed a collimated stream of lithium vapor toward the graphite tiles of the lower center stack and divertor. Lithium depositions from a few mg to 1 g have been applied between discharges. Benefits from the lithium coating were sometimes, but not always seen. These improvements sometimes included decreases plasma density, inductive flux consumption, and ELM frequency, and increases in electron temperature, ion temperature, energy confinement and periods of MHD quiescence. In addition, reductions in lower divertor D, C, and O luminosity were measured.

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  • Report No.: PPPL-4290
  • Grant Number: DE-ACO2-76CHO3073
  • Office of Scientific & Technical Information Report Number: 960233
  • Archival Resource Key: ark:/67531/metadc935488

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Office of Scientific & Technical Information Technical Reports

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  • February 19, 2008

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 12, 2016, 8:53 p.m.

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Kugel, H W; Ahn, J -W; Allain, J P; Bell, R; Boedo, J; Bush, C et al. Lithium Surface Coatings for Improved Plasma Performance in NSTX, report, February 19, 2008; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc935488/: accessed April 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.