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Turbulent optimization of toroidal configurations

H Mynick, P Xanthopoulos, B Faber, M Lucia, M Rorvig, J N Talmadge2014年Plasma Physics and Controlled FusionIF 2.2出版社

Recent progress in 'turbulent optimization' of toroidal configurations is described, using a method recently developed for evolving such configurations to ones having reduced turbulent transport. The method uses the GENE gyrokinetic code to compute the radial heat flux Qgk, and the STELLOPT optimization code with a theory-based 'proxy' figure of merit Qpr to stand in for Qgk for computational speed. Improved expressions for Qpr have been developed, involving further geometric quantities beyond those in the original proxy, which can also be used as 'control knobs' to reduce Qgk. Use of a global search algorithm has led to the discovery of turbulent-optimized configurations not found by the standard, local algorithm usually employed, as has use of a mapping capability which STELLOPT has been extended to provide, of figures of merit over the search space.

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