Physics-Informed Deep Learning Model for Line-integral Diagnostics Across Fusion Devices

• URL: http://arxiv.org/abs/2412.00087v2
• Date: Wed, 05 Feb 2025 11:35:08 GMT
• Title: Physics-Informed Deep Learning Model for Line-integral Diagnostics Across Fusion Devices
• Authors: Cong Wang, Weizhe Yang, Haiping Wang, Renjie Yang, Jing Li, Zhijun Wang, Xinyao Yu, Yixiong Wei, Xianli Huang, Chenshu Hu, Zhaoyang Liu, Changqing Zou, Zhifeng Zhao,
• Abstract summary: Rapid reconstruction of 2D plasma profiles from line-integral measurements is important in nuclear fusion.<n>This paper introduces a physics-informed model architecture called Onion, that can enhance the performance of models.
• Score: 20.883836707493213
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Rapid reconstruction of 2D plasma profiles from line-integral measurements is important in nuclear fusion. This paper introduces a physics-informed model architecture called Onion, that can enhance the performance of models and be adapted to various backbone networks. The model under Onion incorporates physical information by a multiplication process and applies the physics-informed loss function according to the principle of line integration. Experimental results demonstrate that the additional input of physical information improves the model's ability, leading to a reduction in the average relative error E_1 between the reconstruction profiles and the target profiles by approximately 52% on synthetic datasets and about 15% on experimental datasets. Furthermore, the implementation of the Softplus activation function in the final two fully connected layers improves model performance. This enhancement results in a reduction in the E_1 by approximately 71% on synthetic datasets and about 27% on experimental datasets. The incorporation of the physics-informed loss function has been shown to correct the model's predictions, bringing the back-projections closer to the actual inputs and reducing the errors associated with inversion algorithms. Besides, we have developed a synthetic data model to generate customized line-integral diagnostic datasets and have also collected soft x-ray diagnostic datasets from EAST and HL-2A. This study achieves reductions in reconstruction errors, and accelerates the development of diagnostic surrogate models in fusion research.

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