Signal Stellar-AI Platform: AI + HPC + QPU Integration Slashes Fusion Plasma Simulation Time

Summary

The Stellar-AI platform, developed by the Department of Energy's Princeton Plasma Physics Laboratory (PPPL), integrates CPUs, GPUs and quantum processing units to compress fusion plasma simulations that traditionally take months on even the most powerful supercomputers. The system connects directly to experimental fusion devices, including PPPL's National Spherical Torus Experiment-Upgrade (NSTX-U), enabling real-time analysis and rapid model refinement instead of months-long waits. Ongoing projects include building a digital twin of NSTX-U for virtual testing and the StellFoundry initiative, which uses AI to accelerate stellarator design. Partners include national labs, Princeton and MIT, NVIDIA and Microsoft, and private fusion firms such as Commonwealth Fusion Systems. The platform was described in a report published February 22, 2026.