Deep convolutional neural networks for multi-scale time-series classification in fusion devices

Fri, Feb 14, 2020, 12:30 pm
Speaker(s): 
Sponsor(s): 
Center for Statistics and Machine Learning

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 (~30k), achieving an F1-score of ~91% on individual time-slices using only the ECEi data.

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Lunch will be provided.

This interdisciplinary meeting focusses on ML approaches that are useful for the sciences and engineering. The style is informal. Join us if you want to learn new ML approaches for scientific research and, in particular, if you're already using them.