Electron temperature profile reconstructions from multi-energy SXR measurements using neural networks
Abstract
Neural networks have been implemented to reconstruct electron temperature profiles from multi-energy soft-x-ray (ME-SXR) arrays and other plasma diagnostics with fast time resolution. On NSTX, electron temperature profiles are measured with a Thomson scattering diagnostic at 60 Hz, a speed limited by the repetition rate of the lasers. By training a neural network to match fast (>10 kHz) x-ray data with Te profiles from Thomson scattering, the ME-SXR diagnostic can be used to produce Te profiles with high time resolution. In particular, a new ME-SXR system will be used in conjunction with a new laser blow-off impurity injection system to measure cold pulse propagation in NSTX-U plasmas for direct, perturbative heat transport measurements. Synthetic ME-SXR data were used to optimize performance of the neural networks and study the impact of including data from various diagnostics in the networks. Initial tests on data from a previous-generation ME-SXR diagnostic on NSTX have proven successful.
- Publication:
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Plasma Physics and Controlled Fusion
- Pub Date:
- September 2013
- DOI:
- 10.1088/0741-3335/55/9/095015
- Bibcode:
- 2013PPCF...55i5015C