The world’s first all-HTS tokamak, HH70, has once again set a new benchmark. In its 5609th shot, it achieved a 335-second steady-state long-pulse plasma operation.
The long-pulse experiment campaign on HH70 officially commenced in November 2025, culminating in a 120-second pulse during the 5,319th shot on January 6, 2026. After the 120-second shot, HH70’s wall conditioning has had been optimized to further reduce plasma impurities, with pulse length quickly surpassing 300 seconds.
While breaking the 100-second barrier significantly intensifies thermal management challenges and introduces uncertainty from ultra-long-duration plasma physics, we will continue to upgrade the device and optimize our AI-based plasma control algorithms to achieve even better results.