Author

Jiayi Zhi

3 papers indexed here

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Preprint Sep 2026

Observer-Based Model Predictive Control for Isoflux Regulation in the EXL-50U Spherical Tokamak

Isoflux control in spherical tokamaks requires coordinated plasma-current and boundary regulation under coil-voltage and computational constraints. This study develops observer-based constrained model predictive control (MPC) for EXL-50U. Vacuum-vessel spatial coarsening reduces a 538-state linearized model to 40 state...

Chang Lu, Jia-Yi Zhi, Xiang-Yang Guo et al. · 0 citations

Preprint Aug 2026

AI Surrogate Modeling for Real-Time Tokamak Equilibrium Prediction: Benchmarking Neural Architectures and Validation on EXL-50U

Fast and reliable plasma equilibrium prediction is essential for real-time tokamak operation and control, but conventional Grad-Shafranov (GS) solvers are often too costly for real-time deployment. We develop an AI surrogate framework and benchmark five architectures (MLP, CNN, FNO, Transformer, and KAN) on a numerical...

G. Shi, Zitong Zhang, Si-Qi Ding et al. · 0 citations

Preprint Aug 2026

Reinforcement learning for vertical position control on the EXL-50U spherical tokamak

Vertical position control is essential for sustaining high-performance operation in spherical tokamaks, where increased plasma elongation introduces stringent requirements on fast and robust stabilization. This work presents an experimentally validated reinforcement-learning(RL)-based vertical position control framewor...

Lei Xing, Hui Ma, Changquan Yu et al. · 1 citation