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- W2069366505 abstract "Results and interpretation of recent experiments on DIII-D designed to evaluate divertor geometries favourable for radiative heat dispersal are presented. Two approaches examined here involved lengthening the parallel connection in the scrape-off layer, L||, and increasing the radius of the outer divertor separatrix strike point, ROSP, with the goal of reducing target temperature, TTAR, and increasing target density, nTAR. From one-dimensional (1D) two-point modelling based on conducted parallel heat flux, it is expected that: and , where nSEP is the midplane separatrix density. These scalings suggest that conditions conducive to a radiative divertor solution can be achieved at low nSEP by increasing either ROSP or L||. Our data are consistent with the above L|| scalings. On the other hand, the observed dependence of nTAR and TTAR on ROSP displayed a more complex behaviour, under certain conditions deviating from the above scalings. Our analysis indicates that deviations from the ROSP scaling were due to the presence of convected heat flux, driven by escaping neutrals, in the more open configurations of the larger ROSP cases. A comparison of 'open' versus 'closed' divertor configurations for the H-mode plasmas in this study show that the 'closed' case provides at least 30% reduction in the peaked heat flux at common density with the 'open' case and partial divertor detachment at lower plasma density." @default.
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- W2069366505 date "2013-09-27" @default.
- W2069366505 modified "2023-10-18" @default.
- W2069366505 title "Effect of changes in separatrix magnetic geometry on divertor behaviour in DIII-D" @default.
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- W2069366505 doi "https://doi.org/10.1088/0029-5515/53/11/113024" @default.
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