Achievement of Sustained Net Plasma Heating in a Fusion Experiment with the Optometrist Algorithm

Abstract Many fields of basic and applied science require efficiently exploring complex systems with high dimensionality. An example of such a challenge is optimising the performance of plasma fusion experiments. The highly-nonlinear and temporally-varying interaction between the plasma, its environ...

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Autores principales:	E. A. Baltz, E. Trask, M. Binderbauer, M. Dikovsky, H. Gota, R. Mendoza, J. C. Platt, P. F. Riley
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d8591c6bdfa24f809777ccc55abbde98
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spelling	oai:doaj.org-article:d8591c6bdfa24f809777ccc55abbde982021-12-02T11:41:00ZAchievement of Sustained Net Plasma Heating in a Fusion Experiment with the Optometrist Algorithm10.1038/s41598-017-06645-72045-2322https://doaj.org/article/d8591c6bdfa24f809777ccc55abbde982017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-06645-7https://doaj.org/toc/2045-2322Abstract Many fields of basic and applied science require efficiently exploring complex systems with high dimensionality. An example of such a challenge is optimising the performance of plasma fusion experiments. The highly-nonlinear and temporally-varying interaction between the plasma, its environment and external controls presents a considerable complexity in these experiments. A further difficulty arises from the fact that there is no single objective metric that fully captures both plasma quality and equipment constraints. To efficiently optimise the system, we develop the Optometrist Algorithm, a stochastic perturbation method combined with human choice. Analogous to getting an eyeglass prescription, the Optometrist Algorithm confronts a human operator with two alternative experimental settings and associated outcomes. A human operator then chooses which experiment produces subjectively better results. This innovative technique led to the discovery of an unexpected record confinement regime with positive net heating power in a field-reversed configuration plasma, characterised by a >50% reduction in the energy loss rate and concomitant increase in ion temperature and total plasma energy.E. A. BaltzE. TraskM. BinderbauerM. DikovskyH. GotaR. MendozaJ. C. PlattP. F. RileyNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q E. A. Baltz E. Trask M. Binderbauer M. Dikovsky H. Gota R. Mendoza J. C. Platt P. F. Riley Achievement of Sustained Net Plasma Heating in a Fusion Experiment with the Optometrist Algorithm
description	Abstract Many fields of basic and applied science require efficiently exploring complex systems with high dimensionality. An example of such a challenge is optimising the performance of plasma fusion experiments. The highly-nonlinear and temporally-varying interaction between the plasma, its environment and external controls presents a considerable complexity in these experiments. A further difficulty arises from the fact that there is no single objective metric that fully captures both plasma quality and equipment constraints. To efficiently optimise the system, we develop the Optometrist Algorithm, a stochastic perturbation method combined with human choice. Analogous to getting an eyeglass prescription, the Optometrist Algorithm confronts a human operator with two alternative experimental settings and associated outcomes. A human operator then chooses which experiment produces subjectively better results. This innovative technique led to the discovery of an unexpected record confinement regime with positive net heating power in a field-reversed configuration plasma, characterised by a >50% reduction in the energy loss rate and concomitant increase in ion temperature and total plasma energy.
format	article
author	E. A. Baltz E. Trask M. Binderbauer M. Dikovsky H. Gota R. Mendoza J. C. Platt P. F. Riley
author_facet	E. A. Baltz E. Trask M. Binderbauer M. Dikovsky H. Gota R. Mendoza J. C. Platt P. F. Riley
author_sort	E. A. Baltz
title	Achievement of Sustained Net Plasma Heating in a Fusion Experiment with the Optometrist Algorithm
title_short	Achievement of Sustained Net Plasma Heating in a Fusion Experiment with the Optometrist Algorithm
title_full	Achievement of Sustained Net Plasma Heating in a Fusion Experiment with the Optometrist Algorithm
title_fullStr	Achievement of Sustained Net Plasma Heating in a Fusion Experiment with the Optometrist Algorithm
title_full_unstemmed	Achievement of Sustained Net Plasma Heating in a Fusion Experiment with the Optometrist Algorithm
title_sort	achievement of sustained net plasma heating in a fusion experiment with the optometrist algorithm
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/d8591c6bdfa24f809777ccc55abbde98
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Achievement of Sustained Net Plasma Heating in a Fusion Experiment with the Optometrist Algorithm

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