Search Results - "Stotler, D. P"

Intermittency in the scrape-off layer of the National Spherical Torus Experiment during H-mode confinement by Maqueda, R.J., Stotler, D.P., Zweben, S.J.

“…A gas puff imaging diagnostic is used in the National Spherical Tokamak Experiment [M. Ono, et al., Nucl. Fusion 40 (2000) 557] to study the edge turbulence…”
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Spatial structure of scrape-off-layer filaments near the midplane and X-point regions of Alcator-C-Mod by Terry, J.L., Zweben, S.J., Umansky, M.V., Cziegler, I., Grulke, O., LaBombard, B., Stotler, D.P.

“…Movies of edge turbulence at both the outboard midplane and the region outboard of the typical lower X-point location in C-Mod have been obtained using…”
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Turbulent transport and the scrape-off-layer width by Myra, J.R., Russell, D.A., D’Ippolito, D.A., Ahn, J-W., Maingi, R., Maqueda, R.J., Lundberg, D.P., Stotler, D.P., Zweben, S.J., Umansky, M.

“…The two-dimensional fluid turbulence code SOLT is employed to study the role of midplane turbulence on the scrape-off-layer (SOL) heat flux width of tokamak…”
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Estimate of convective radial transport due to SOL turbulence as measured by GPI in Alcator C-Mod by Zweben, S.J., Terry, J.L., LaBombard, B., Agostini, M., Greenwald, M., Grulke, O., Hughes, J.W., D’Ippolito, D.A., Krasheninnikov, S.I., Myra, J.R., Russell, D.A., Stotler, D.P., Umansky, M.

“…The convective radial transport effects of SOL turbulence have been estimated using recent turbulence data from the gas puff imaging (GPI) camera diagnostic on…”
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Progress towards the validation of models of the behavior of neutral helium in gas puff imaging experiments by Stotler, D.P., Boedo, J., LeBlanc, B., Maqueda, R.J., Zweben, S.J.

“…Gas puff imaging (GPI) experiments are designed to provide high time and space resolution data on the structure of plasma turbulence in the plane perpendicular…”
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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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Towards a revised Monte Carlo neutral particle surface interaction model by Stotler, D P

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Three-dimensional simulation of gas conductance measurement experiments on Alcator C-Mod by Stotler, D.P., LaBombard, B.

“…Three-dimensional Monte Carlo neutral transport simulations of gas flow through the Alcator C-Mod sub-divertor yield conductances comparable to those found in…”
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Scrape-off layer plasma and neutral characteristics and their interactions with walls for FNSF by Rognlien, T.D., Rensink, M.E., Stotler, D.P.

“…•Peak heat fluxes less than 10MW/m2 on divertor plates and walls are possible with strong neon seeding.•Steady-state partial/complete detached divertor plasma…”
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Reconstruction of NSTX midplane neutral density profiles from visible imaging data by Stotler, D.P., Scotti, F., Bell, R.E., LeBlanc, B.P., Raman, R.

“…The experimental determination of neutral densities in tokamak plasmas from line radiation is only accurate in the narrow region in which both the excitation…”
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Modeling the reduction of gross lithium erosion observed under high-flux deuterium bombardment by Abrams, T., Jaworski, M.A., Kaita, R., Nichols, J.H., Stotler, D.P., De Temmerman, G., van den Berg, M.A., van der Meiden, H.J., Morgan, T.W.

“…Both thin (<1μm) and thick (∼500μm) lithium films under high-flux deuterium and neon plasma bombardment were studied in the linear plasma device Magnum-PSI at…”
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Erosion of lithium coatings on TZM molybdenum and graphite during high-flux plasma bombardment by Abrams, T., Jaworski, M.A., Kaita, R., Stotler, D.P., De Temmerman, G., Morgan, T.W., van den Berg, M.A., van der Meiden, H.J.

“…•A formula for temperature-dependent lithium sputtering and evaporation is proposed.•This formula was tested using the Magnum-PSI linear plasma…”
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OEDGE modeling of outer wall erosion in NSTX and the effect of changes in neutral pressure by Nichols, J.H., Jaworski, M.A., Kaita, R., Abrams, T., Skinner, C.H., Stotler, D.P.

“…Gross erosion from the outer wall is expected to be a major source of impurities for high power fusion devices due to the low redeposition fraction. Scaling…”
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Observation of non-Maxwellian electron distributions in the NSTX divertor by Jaworski, M.A., Bell, M.G., Gray, T.K., Kaita, R., Kaganovich, I., Kallman, J., Kugel, H.W., LeBlanc, B., McLean, A.G., Sabbagh, S.A., Scotti, F., Soukhanovskii, V.A., Stotler, D.P.

“…The scrape-off layer plasma at the tokamak region is characterized by open field lines and often contains large variations in plasma properties along these…”
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Pedestal fueling simulations with a coupled kinetic plasma–kinetic neutral transport code by Stotler, D.P., Chang, C.S., Ku, S.H., Lang, J., Park, G.Y.

“…The simplified neutral transport routine in the guiding center ion–electron-neutral neoclassical PIC code XGC0 has been replaced by one that calls the Monte…”
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Modeling of hydrogen ground state rotational and vibrational temperatures in kinetic plasmas by Farley, D.R., Stotler, D.P., Lundberg, D.P., Cohen, S.A.

“…A dipole-quadrupole electron-impact excitation model, consistent with molecular symmetry rules, is presented to fit ro-vibronic spectra of the hydrogen…”
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Modification of atomic physics rates due to nonlocal electron parallel heat transport in divertor plasmas by Allais, F., Matte, J.P., Alouani-Bibi, F., Kim, C.G., Stotler, D.P., Rognlien, T.D.

“…The effect of steep temperature gradients on the rate of ionization of atomic hydrogen is studied numerically with the electron kinetic code ‘FPI’ [Phys. Rev…”
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Modification of the electron energy distribution function during lithium experiments on the National Spherical Torus Experiment by Jaworski, M.A., Bell, M.G., Gray, T.K., Kaita, R., Kallman, J., Kugel, H.W., LeBlanc, B., McLean, A.G., Sabbagh, S.A., Soukhanovskii, V.A., Stotler, D.P., Surla, V.

“…► We examine Langmuir probe signals during liquid lithium experiments. ► Two interpretation methods are used, classical and non-local. ► We find increased…”
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Scientific and Computational Challenges in Coupled Plasma Edge/Plasma-Material Interactions for Fusion Tokamaks by Brooks, J. N., Hassanein, A., Koniges, A., Krstic, P. S., Rognlien, T. D., Sizyuk, T., Sizyuk, V., Stotler, D. P.

“…Plasma/material interactions is a critical scientific issue for fusion power, with major potential limitations on plasma core and edge operating parameters…”
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Three-Dimensional Neutral Transport Simulations of Gas Puff Imaging Experiments by Stotler, D. P., D'Ippolito, D. A., LeBlanc, B., Maqueda, R. J., Myra, J. R., Sabbagh, S. A., Zweben, S. J.

“…Gas Puff Imaging (GPI) experiments are designed to isolate the structure of plasma turbulence in the plane perpendicular to the magnetic field…”
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