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- W2781336095 abstract "The isotope mass scaling of the energy confinement time in tokamak plasmas differs from gyro-Bohm estimates, with implications for the extrapolation from current experiments to D-T reactors. Differences in mass scaling in L-mode and various H-mode regimes suggest that the isotope effect may originate from the pedestal. In the pedestal, sharp gradients render local diffusive estimates invalid, and global effects due to orbit-width scale profile variations have to be taken into account. We calculate neoclassical cross-field fluxes from a radially global drift-kinetic equation using the PERFECT code [Landreman et al. (2014) PPCF 56, 045005], to study isotope composition effects in density pedestals. The relative reduction to the peak heat flux due to global effects as a function of the density scale length is found to saturate at an isotope-dependent value that is larger for heavier ions. We also consider D-T and H-D mixtures with a focus on isotope separation. The ability to reproduce the mixture results via single-species simulations with artificial DT and HD species has been considered. These computationally convenient single ion simulations give a good estimate of the total ion heat flux in corresponding mixtures." @default.
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- W2781336095 date "2017-10-27" @default.
- W2781336095 modified "2023-09-23" @default.
- W2781336095 title "Isotope and mixture effects on neoclassical transport in the pedestal" @default.
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