Search Results - "Skinner, C H"

Recent DIII-D progress toward validating models of tungsten erosion, re-deposition, and migration for application to next-step fusion devices by Abrams, T, Guterl, J G, Abe, S, Donovan, D C, Bykov, I, Johnson, C A, Nichols, J H, Elder, J D, Ennis, D A, Loch, S D, Rudakov, D L, Sinclair, G, Skinner, C H, Stangeby, P C, Thomas, D M, Unterberg, E A, Wampler, W R

“…Abstract Fundamental mechanisms governing the erosion and prompt re-deposition of tungsten impurities in tokamak divertors are identified and analyzed to…”
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Transition to ELM-free improved H-mode by lithium deposition on NSTX graphite divertor surfaces by Mansfield, D.K., Kugel, H.W., Maingi, R., Bell, M.G., Bell, R., Kaita, R., Kallman, J., Kaye, S., LeBlanc, B., Mueller, D., Paul, S., Raman, R., Roquemore, L., Sabbagh, S., Schneider, H., Skinner, C.H., Soukhanovskii, V., Timberlake, J., Wilgen, J., Zakharov, L.

“…Lithium evaporated onto plasma facing components in the NSTX lower divertor has made dramatic improvements in discharge performance. As lithium accumulated,…”
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Advances in boronization on NSTX-Upgrade by Skinner, C. H, Bedoya, F., Scotti, F., Allain, J.P., Blanchard, W., Cai, D., Jaworski, M., Koel, B.E.

“…•A new deuterated tri-methyl boron conditioning system was implemented on NSTX-U.•The deposition pattern was characterized vs. experimental conditions.•The…”
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Deuterium retention in NSTX with lithium conditioning by Skinner, C.H., Allain, J.P., Blanchard, W., Kugel, H.W., Maingi, R., Roquemore, L., Soukhanovskii, V., Taylor, C.N.

“…High (≈90%) deuterium retention was observed in NSTX gas balance measurements both with- and without lithiumization of the carbon plasma-facing components. The…”
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Surface chemistry and physics of deuterium retention in lithiated graphite by Taylor, C.N., Allain, J.P., Heim, B., Krstic, P.S., Skinner, C.H., Kugel, H.W.

“…Lithium wall conditioning in TFTR, CDX-U, T-11M, TJ-II and NSTX is found to yield enhanced plasma performance manifest, in part, through improved deuterium…”
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NSTX plasma response to lithium coated divertor by Kugel, H.W., Bell, M.G., Allain, J.P., Bell, R.E., Ding, S., Gerhardt, S.P., Jaworski, M.A., Kaita, R., Kallman, J., Kaye, S.M., LeBlanc, B.P., Maingi, R., Majeski, R., Maqueda, R., Mansfield, D.K., Mueller, D., Nygren, R., Paul, S.F., Raman, R., Roquemore, A.L., Sabbagh, S.A., Schneider, H., Skinner, C.H., Soukhanovskii, V.A., Taylor, C.N., Timberlake, J.R., Wampler, W.R., Zakharov, L.E., Zweben, S.J.

“…NSTX experiments have explored lithium evaporated on a graphite divertor and other plasma-facing components in both L- and H- mode confinement regimes heated…”
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3D measurements of mobile dust particle trajectories in NSTX by Roquemore, A.L., Nishino, N., Skinner, C.H., Bush, C., Kaita, R., Maqueda, R., Davis, W., Pigarov, A.Yu, Krasheninnikov, S.I.

“…The transport of dust particles in plasmas may play a significant role in the performance of next step fusion devices. Highly mobile incandescent dust…”
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Effect of lithium PFC coatings on NSTX density control by Kugel, H.W., Bell, M.G., Bell, R., Bush, C., Gates, D., Gray, T., Kaita, R., Leblanc, B., Maingi, R., Majeski, R., Mansfield, D., Mueller, D., Paul, S., Raman, R., Roquemore, A.L., Sabbagh, S., Skinner, C.H., Soukhanovskii, V., Stevenson, T., Zakharov, L.

“…Lithium coatings on the graphite plasma facing components (PFCs) in NSTX are being investigated as a tool for density profile control and reducing the…”
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The Materials Analysis Particle Probe (MAPP) Diagnostic System in NSTX by Heim, B., Gonderman, S., Taylor, C. N., Allain, J. P., Yang, Z. C., Gonzalez, M., Collins, E., Skinner, C. H., Ellis, B., Blanchard, W., Roquemore, L., Kugel, H. W., Martin, R., Kaita, R.

“…Lithium conditioning of plasma-facing surfaces has been implemented in National Spherical Torus Experiment (NSTX) leading to improvements in plasma performance…”
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3-D reconstruction of pre-characterized lithium and tungsten dust particle trajectories in NSTX by Nichols, J., Roquemore, A.L., Davis, W., Mansfield, D.K., Skinner, C.H., Feibush, E., Boeglin, W., Patel, R., Abolafia, D., Hartzfeld, K., Maqueda, R.

“…Calibrated amounts of 40μm lithium dust and 10μm tungsten powder have been dropped from above into the SOL of the National Spherical Torus Experiment (NSTX) to…”
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Raman spectroscopy of carbon dust samples from NSTX by Raitses, Y., Skinner, C.H., Jiang, F., Duffy, T.S.

“…The Raman spectrum of dust particles exposed to the NSTX plasma is different from the spectrum of unexposed particles scraped from an unused graphite tile. For…”
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Measurements of accumulated metallic impurities during LiTER operation in NSTX by Paul, S.F., Skinner, C.H., Robinson, J.A., LeBlanc, B., Kugel, H.W.

“…Over 100 g of lithium was evaporated onto the NSTX plasma facing components using two stainless steel ovens (LiTER). Plasma emission was recorded using a…”
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Large aperture electrostatic dust detector by Skinner, C.H., Hensley, R., Roquemore, A.L.

“…Diagnosis and management of dust inventories generated in next-step magnetic fusion devices is necessary for their safe operation. A novel electrostatic dust…”
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Is carbon a realistic choice for ITER's divertor? by Skinner, C H, Federici, G

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Electrostatic dust detection on remote surfaces by Voinier, C., Skinner, C.H., Roquemore, A.L.

“…The inventory of dust in next-step magnetic fusion devices will be regulated for safety reasons, however diagnostics to measure in-vessel dust are still in…”
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Controlling surface dust in a tokamak by Parker, C.V., Skinner, C.H., Roquemore, A.L.

“…Methods to measure the inventory of dust particles and to remove dust if it approaches safety limits will be required in next-step tokamaks. A novel…”
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Simulations of diffusive lithium evaporation onto the NSTX vessel walls by Stotler, D.P., Skinner, C.H., Blanchard, W.R., Krstic, P.S., Kugel, H.W., Schneider, H., Zakharov, L.E.

“…A model for simulating the diffusive evaporation of lithium into a helium filled NSTX vacuum vessel is described and validated against an initial set of…”
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Lithium coatings on NSTX plasma facing components and its effects on boundary control, core plasma performance, and operation by Kugel, H.W., Bell, M.G., Schneider, H., Allain, J.P., Bell, R.E., Kaita, R., Kallman, J., Kaye, S., LeBlanc, B.P., Mansfield, D., Nygren, R.E., Maingi, R., Menard, J., Mueller, D., Ono, M., Paul, S., Gerhardt, S., Raman, R., Sabbagh, S., Skinner, C.H., Soukhanovskii, V., Timberlake, J., Zakharov, L.E.

“…NSTX high power divertor plasma experiments have used in succession lithium pellet injection (LPI), evaporated lithium, and injected lithium powder to apply…”
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Pulse-by-pulse measurements of dynamic retention and deposition in NSTX by Skinner, C.H., Kugel, H.W., Roquemore, A.L., Maingi, R., Wampler, W.R.

“…Three quartz crystal microbalances have been deployed in NSTX to measure deposition/erosion in plasma shadowed areas at the upper and lower divertor and…”
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Micro-trench measurements of the net deposition of carbon impurity ions in the DIII-D divertor and the resulting suppression of surface erosion by Abe, S, Skinner, C H, Bykov, I, Guterl, J, Lasa, A, Yeh, Y W, Coburn, J, Rudakov, D L, Lasnier, C J, Wang, H Q, McLean, A G, Abrams, T, Koel, B E

“…In this work, we report carbon impurity ion incident angles and deposition rates, along with silicon erosion rates, from measurements of micro-engineered…”
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