Exploration of Stellarator Configuration Space with Global Search Methods

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An exploration of stellarator configuration space z for quasi-axisymmetric stellarator (QAS) designs is discussed, using methods which provide a more global view of that space. To this end, we have implemented a ''differential evolution'' (DE) search algorithm in an existing stellarator optimizer, which is much less prone to become trapped in local, suboptimal minima of the cost function chi than the local search methods used previously. This search algorithm is complemented by mapping studies of chi over z aimed at gaining insight into the results of the automated searches. We find that a wide range of the attractive QAS configurations ... continued below

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780 Kilobytes pages

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Mynick, H.E.; Pomphrey, N. & Ethier, S. September 10, 2001.

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Description

An exploration of stellarator configuration space z for quasi-axisymmetric stellarator (QAS) designs is discussed, using methods which provide a more global view of that space. To this end, we have implemented a ''differential evolution'' (DE) search algorithm in an existing stellarator optimizer, which is much less prone to become trapped in local, suboptimal minima of the cost function chi than the local search methods used previously. This search algorithm is complemented by mapping studies of chi over z aimed at gaining insight into the results of the automated searches. We find that a wide range of the attractive QAS configurations previously found fall into a small number of classes, with each class corresponding to a basin of chi(z). We develop maps on which these earlier stellarators can be placed, the relations among them seen, and understanding gained into the physics differences between them. It is also found that, while still large, the region of z space containing practically realizable QAS configurations is much smaller than earlier supposed.

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780 Kilobytes pages

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INIS; OSTI as DE00788261

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  • Other Information: PBD: 10 Sep 2001

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  • Report No.: PPPL-3610
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/788261 | External Link
  • Office of Scientific & Technical Information Report Number: 788261
  • Archival Resource Key: ark:/67531/metadc718041

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Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • September 10, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • April 15, 2016, 9:19 p.m.

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Mynick, H.E.; Pomphrey, N. & Ethier, S. Exploration of Stellarator Configuration Space with Global Search Methods, report, September 10, 2001; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc718041/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.