Abstract
The NARX-GA hybrid neural network was applied to simulate the time evolution of runaway electrons (REs) in the plasma tokamak. This particular type of artificial neural network was created specifically for time series prediction. The NARX-GA network was built using inputs from some plasma diagnostic signals (loop voltage, hard X-ray) collected during all phases of plasma tokamak discharges. The network output predicts the time evolution of hard X-ray (HXR) signals up to 500 μs, which can be achieved with high accuracy (MSE = \(3.76\times {10}^{-5}\)). The real-time application of this methodology can pave the way for prompt REs control action. The confinement time increases as the REs generation decreases, and their destructive effects on the tokamak wall decrease as well. Early prediction of RE behavior is critical in attempting to mitigate their potentially dangerous effects.
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Data Availability Statement
This manuscript has no associated data or the data will not be deposited. The data that support the findings of this study are available upon reasonable request from the authors.
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All authors contributed to the study conception and design. Data collection and analysis were performed by AA, SS, MRG, SEA, and AK. The first draft of the manuscript was written by AA, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Alavi, A., Saadat, S., Ghanbari, M.R. et al. Simulation of hard X-ray time evolution in plasma tokamak by using the NARX-GA hybrid neural network. Eur. Phys. J. D 76, 199 (2022). https://doi.org/10.1140/epjd/s10053-022-00511-6
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DOI: https://doi.org/10.1140/epjd/s10053-022-00511-6