Deep convolutional neural networks for multi-scale time-series classification and application to disruption prediction in fusion devices

Churchill, R.M; the DIII-D team
Issue date: October 2019
Cite as:
Churchill, R.M & the DIII-D team. (2020). Deep convolutional neural networks for multi-scale time-series classification and application to disruption prediction in fusion devices [Data set]. Princeton Plasma Physics Laboratory, Princeton University.
@electronic{churchill_rm_2020,
  author      = {Churchill, R.M and
                the DIII-D team},
  title       = {{Deep convolutional neural networks for m
                ulti-scale time-series classification an
                d application to disruption prediction i
                n fusion devices}},
  publisher   = {{Princeton Plasma Physics Laboratory, Pri
                nceton University}},
  year        = 2020
}
Abstract:

The multi-scale, mutli-physics nature of fusion plasmas makes predicting plasma events challenging. Recent advances in deep convolutional neural network architectures (CNN) utilizing dilated convolutions enable accurate predictions on sequences which have long-range, multi-scale characteristics, such as the time-series generated by diagnostic instruments observing fusion plasmas. Here we apply this neural network architecture to the popular problem of disruption prediction in fusion tokamaks, utilizing raw data from a single diagnostic, the Electron Cyclotron Emission imaging (ECEi) diagnostic from the DIII-D tokamak. ECEi measures a fundamental plasma quantity (electron temperature) with high temporal resolution over the entire plasma discharge, making it sensitive to a number of potential pre-disruptions markers with different temporal and spatial scales. Promising, initial disruption prediction results are obtained training a deep CNN with large receptive field ({$\sim$}30k), achieving an $F_1$-score of {$\sim$}91\% on individual time-slices using only the ECEi data.

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