Deuterium Retention in NSTX with Lithium Conditioning

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High (≈ 90%) deuterium retention was observed in NSTX gas balance measurements both withand without lithiumization of the carbon plasma facing components. The gas retained in ohmic discharges was measured by comparing the vessel pressure rise after a discharge to that of a gasonly pulse with the pumping valves closed. For neutral beam heated discharges the gas input and gas pumped by the NB cryopanels were tracked. The discharges were followed by outgassing of deuterium that reduced the retention. The relationship between retention and surface chemistry was explored with a new plasma-material interface probe connected to an in-vacuo surface science ... continued below

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C.H. Skinner, J.P. Allain, W. Blanchard, H.W. Kugel, R. Maingi, L. Roquemore, V. Soukhanovskii, C.N. Taylor June 2, 2010.

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High (≈ 90%) deuterium retention was observed in NSTX gas balance measurements both withand without lithiumization of the carbon plasma facing components. The gas retained in ohmic discharges was measured by comparing the vessel pressure rise after a discharge to that of a gasonly pulse with the pumping valves closed. For neutral beam heated discharges the gas input and gas pumped by the NB cryopanels were tracked. The discharges were followed by outgassing of deuterium that reduced the retention. The relationship between retention and surface chemistry was explored with a new plasma-material interface probe connected to an in-vacuo surface science station that exposed four material samples to the plasma. XPS and TDS analysis showed that the binding of D atoms is fundamentally changed by lithium - in particular atoms are weakly bonded in regions near lithium atoms bound to either oxygen or the carbon matrix.

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  • 19th International Conference on Plasma Wall Interactions, San Diego, CA May 20-24, 2010
  • Journal of Nuclear Materials

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  • Report No.: PPPL-4524
  • Grant Number: DE-ACO2-09CH11466
  • Office of Scientific & Technical Information Report Number: 981718
  • Archival Resource Key: ark:/67531/metadc1012221

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  • June 2, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Jan. 2, 2018, 1:07 p.m.

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C.H. Skinner, J.P. Allain, W. Blanchard, H.W. Kugel, R. Maingi, L. Roquemore, V. Soukhanovskii, C.N. Taylor. Deuterium Retention in NSTX with Lithium Conditioning, article, June 2, 2010; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc1012221/: accessed August 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.