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Changquan Yu

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#artificial intelligence Preprint Oct 2026

From Forecasting to Feedback: Evaluating Learned Dynamics for Tokamak Control

Learned temporal models are moving beyond offline forecasting toward interactive environments for decision making, yet logged-trajectory accuracy need not predict closed-loop behavior under policies optimized in the learned model. This forecasting-control gap matters in tokamak magnetic control, where coupled plasma-ci...

G. Shi, Si-Qi Ding, Xuan-He Wang et al. · 0 citations
Preprint Aug 2026

Advantage-level Aggregation Reinforcement Learning for X-point Target Magnetic Configuration Control in an EXL-50U Experiment-Calibrated Simulation Environment

Managing divertor heat loads is a central challenge for compact, high-power tokamaks. To increase local flux expansion and decouple the dissipation volume from the core, EHL-2 adopts the X-point target (XPT) divertor. This requires the secondary X-point to remain on the divertor leg; displacement degrades the topology...

Si-Qi Ding, Xuanhe Wang, Peixin Guo et al. · 1 citation
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

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