129 research outputs found

    Discussion [1951]

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    Design of Flexible Pavements

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    Kentucky\u27s Progress on the Interstate System

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    Light Meson Dynamics Workshop. Mini proceedings

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    The mini-proceedings of the Light Meson Dynamics Workshop held in Mainz from February 10th to 12th, 2014, are presented. The web page of the conference, which contains all talks, can be found at https://indico.cern.ch/event/287442/overview .Comment: 46 pages, 17 contributions. Editors: W. Gradl, P. Masjuan, M. Ostrick, and S. Schere

    Gyrokinetic GENE simulations of DIII-D near-edge L-mode plasmas

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    We present gyrokinetic simulations with the GENE code addressing the near-edge region of an L-mode plasma in the DIII-D tokamak. At radial position ρ=0.80\rho=0.80, simulations with the ion temperature gradient increased by 40%40\% above the nominal value give electron and ion heat fluxes that are in simultaneous agreement with the experiment. This gradient increase is consistent with the combined statistical and systematic uncertainty σ\sigma of the Charge Exchange Recombination Spectroscopy (CER) measurements at the 1.6σ1.6 \sigma level. Multi-scale simulations are carried out with realistic mass ratio and geometry for the first time in the near-edge. These multi-scale simulations suggest that the highly unstable ion temperature gradient (ITG) modes of the flux-matched ion-scale simulations suppress electron-scale transport, such that ion-scale simulations are sufficient at this location. At radial position ρ=0.90\rho=0.90, nonlinear simulations show a hybrid state of ITG and trapped electron modes~(TEMs), which was not expected from linear simulations. The nonlinear simulations reproduce the total experimental heat flux with the inclusion of E×B\mathbf{E} \times \mathbf{B} shear effects and an increase in the electron temperature gradient by 23%\sim 23\%. This gradient increase is compatible with the combined statistical and systematic uncertainty of the Thomson scattering data at the 1.3σ1.3 \sigma level. These results are consistent with previous findings that gyrokinetic simulations are able to reproduce the experimental heat fluxes by varying input parameters close to their experimental uncertainties, pushing the validation frontier closer to the edge region.Comment: 14 pages, 17 figures, published in Physics of Plasma
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