Prediction of plasma rotation velocity and ion temperature profiles in EAST Tokamak using artificial neural network models

• Published in: Nuclear fusion 2024-10, Vol.64 (10), p.106061
• Main Authors: Lin, Zichao, Zhang, Hongming, Wang, Fudi, Bae, Cheonho, Fu, Jia, Shen, Yongcai, Dai, Shuyu, Jin, Yifei, Lu, Dian, Fu, Shengyu, Ji, Huajian, Lyu, Bo
• Format: Article
• Language: English
• Subjects: artificial neural networks; ion temperature; profile modelling; rotation velocity
• ISSN: 0029-5515; 1741-4326
• DOI: 10.1088/1741-4326/ad73e8

Artificial neural network models have been developed to predict rotation velocity and ion temperature profiles on the EAST tokamak based on spectral measurements from the x-ray crystal spectrometer. Both Deep Neural Network (DNN) and Convolutional Neural Network (CNN) models have been employed to infer line-integrated ion temperatures. The predicted results from these two models exhibit a strong correlation with the target values, providing an opportunity for cross-validation to enhance prediction accuracy. Notably, the computational speed of these models has been significantly increased, surpassing traditional methods by over tenfold. Furthermore, the investigation of input data range and error prediction serves as the foundation for future automated calculation process. Finally, CNNs have also been employed to predict line-integrated rotation velocity profiles and inverted ion temperature profiles for their robustness in the training process. It is noted that these algorithms are not restricted to any specific physics model and can be readily adapted to various fusion devices.