Liquid Lithium Limiter Effects on Tokamak Plasmas and Plasma-Liquid Surface Interactions

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We present results from the first experiments with a large area liquid lithium limiter in a magnetic fusion device, and its effect on improving plasma performance by reducing particle recycling. Using large area liquid metal surfaces in any major fusion device is unlikely before a test on a smaller scale. This has motivated its demonstration in the CDX-U spherical torus with a unique, fully toroidal lithium limiter. The highest current discharges were obtained with a liquid lithium limiter. There was a reduction in recycling, as indicated by a significant decrease in the deuterium-alpha emission and oxygen radiation. How these results ... continued below

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812 Kilobytes pages

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Kaita, R.; Majeski, R.; Doerner, R.; Antar, G.; Baldwin, M.; Conn, R. et al. October 15, 2002.

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Description

We present results from the first experiments with a large area liquid lithium limiter in a magnetic fusion device, and its effect on improving plasma performance by reducing particle recycling. Using large area liquid metal surfaces in any major fusion device is unlikely before a test on a smaller scale. This has motivated its demonstration in the CDX-U spherical torus with a unique, fully toroidal lithium limiter. The highest current discharges were obtained with a liquid lithium limiter. There was a reduction in recycling, as indicated by a significant decrease in the deuterium-alpha emission and oxygen radiation. How these results might extrapolate to reactors is suggested in recycling/retention experiments with liquid lithium surfaces under high-flux deuterium and helium plasma bombardment in PISCES-B. Data on deuterium atoms retained in liquid lithium indicate retention of all incident ions until full volumetric conversion to lithium deuteride. The PISCES-B results also show a material loss mechanism that lowers the maximum operating temperature compared to that for the liquid surface equilibrium vapor pressure. This may restrict the lithium temperature in reactors.

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812 Kilobytes pages

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INIS; OSTI as DE00809848

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  • Other Information: PBD: 15 Oct 2002

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  • Report No.: PPPL-3755
  • Grant Number: AC02-76CH03037
  • DOI: 10.2172/809848 | External Link
  • Office of Scientific & Technical Information Report Number: 809848
  • Archival Resource Key: ark:/67531/metadc733858

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  • October 15, 2002

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 15, 2016, 9:26 p.m.

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Kaita, R.; Majeski, R.; Doerner, R.; Antar, G.; Baldwin, M.; Conn, R. et al. Liquid Lithium Limiter Effects on Tokamak Plasmas and Plasma-Liquid Surface Interactions, report, October 15, 2002; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc733858/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.