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• W2028204546 endingPage "083028" @default.
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• W2028204546 abstract "Inter-ELM and ELM divertor power loads were measured on JET in dedicated deuterium, hydrogen and helium discharges. Matched triplets (D, H, He) were obtained for different values of magnetic field, B , plasma current, I p , line average plasma density, n , and heating power, P . In this paper, the above experiments are described and the results are presented in terms of empirical scalings of inter-ELM and ELM wetted areas (power widths) versus engineering parameters. The inter-ELM wetted area on the outer target is found to scale roughly as , where A and Z and the fuel ion mass and charge numbers, and q cyl is the cylindrical safety factor, and the ELM wetted area as . The obtained inter-ELM scalings are then compared with those previously reported in the literature and with a wide range of 0D theoretical predictions. For this purpose a family of scrape-off layer power width models was constructed based on a permutation of different assumptions for parallel and perpendicular transport. It is found that a combination of parallel electron conduction and drift-ordered radial convection offers the best overall match to the empirical data, closely followed by models based on marginal stability to interchange/ballooning modes and ion convection with transport ordered radial velocity. Finally, implications for ITER are tentatively drawn, and a revised estimate for the power width in ITER is proposed. Extrapolating to ITER based on the empirical JET scaling and the optimum size scaling of R 0.7±0.6 , obtained based on comparison with simple models, yields a median outer target inter-ELM power width of ∼5.5 ± 2 mm (mapped to the outer mid-plane), in close agreement with previous estimates and the ITER design value. The most pessimistic forecasts (little or no size scaling and inverse linear B dependence, i.e. pure inverse current scaling) yield values as small as 2 mm. The resolution of the size scaling issue calls for additional inter-machine comparisons." @default.
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• W2028204546 date "2011-07-15" @default.
• W2028204546 modified "2023-10-17" @default.
• W2028204546 title "Multi-parameter scaling of divertor power load profiles in D, H and He plasmas on JET and implications for ITER" @default.
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• W2028204546 doi "https://doi.org/10.1088/0029-5515/51/8/083028" @default.
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