Improvement in Plasma Performance with Lithium Coatings in NSTX
Authors: R. Kaita, H. Kugel, J-W. Ahn, J. P. Allain, M. G. Bell, R. Bell, J. Boedo, C. Bush, D. Mansfield, J. Menard, D. Mueller, M. Ono, S. Paul, R. Raman, A. L. Roquemore, P.W. Ross, S. Sabbagh, H. Schneider, C.H. Skinner, V. Soukhanovskii, T. Stevenson, D. Stotler, J. Timberlake, W.R. Wampler, J. B. Wilgen, L. Zakharov
Abstract:
Lithium as a plasma-facing material has attractive features, including a reduction in the recycling of hydrogenic species and the potential for withstanding high heat and neutron fluxes in fusion reactors. Dramatic effects on plasma performance with lithium-coated plasma-facing components (PFCOs) have been demonstrated on many fusion devices,
including TFTR, [1] T-11M, [2] and FT-U. [3] Using a liquid-lithium-filled tray as a limiter, the CDX-U device achieved very significant enhancement in the confinement time of ohmically heated plasmas. [4] The recent NSTX experiments reported here have demonstrated, for the first time, significant and recurring benefits of lithium PFC coatings on divertor plasma performance in both L- and H- mode regimes heated by neutral beams.
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Presented at: 35th EPS Plasma Physics Connference, Crete, Greece June 2008
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