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• W3209504408 abstract "Abstract This paper describes a real-time capable algorithm for identifying the safe operating region around a tokamak operating point. The region is defined by a convex set of linear constraints, from which the distance of a point from a disruptive boundary can be calculated. The disruptivity of points is calculated from an empirical machine learning predictor that generates the likelihood of disruption. While the likelihood generated by such empirical models can be compared to a threshold to trigger a disruption mitigation system, the safe operating region calculation enables active optimization of the operating point to maintain a safe margin from disruptive boundaries. The proposed algorithm is tested using a random forest disruption predictor fit on data from DIII-D. The safe operating region identification algorithm is applied to historical data from DIII-D showing the evolution of disruptive boundaries and the potential impact of optimization of the operating point. Real-time relevant execution times are made possible by parallelizing many of the calculation steps and implementing the algorithm on a graphics processing unit. A real-time capable algorithm for optimizing the target operating point within the identified constraints is also proposed and simulated." @default.
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• W3209504408 date "2021-12-16" @default.
• W3209504408 modified "2023-10-16" @default.
• W3209504408 title "Toward active disruption avoidance via real-time estimation of the safe operating region and disruption proximity in tokamaks" @default.
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• W3209504408 doi "https://doi.org/10.1088/1741-4326/ac359e" @default.
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