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Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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Nuclear Technology
Fusion Science and Technology
August 2025
Latest News
New coolants, new fuels: A new generation of university reactors
Here’s an easy way to make aging U.S. power reactors look relatively youthful: Compare them (average age: 43) with the nation’s university research reactors. The 25 operating today have been licensed for an average of about 58 years.
Panle Liu, Bo Li, Xue Zheng, Xiang Chen, Qiang Li, Junzhao Zhang, Yihang Chen, Jian Zhou, Rui Ma, Zhongmin Huang
Fusion Science and Technology | Volume 81 | Number 5 | July 2025 | Pages 413-424
Research Article | doi.org/10.1080/15361055.2024.2437331
Articles are hosted by Taylor and Francis Online.
Achieving advanced divertor configurations and high-confinement operating regimes is crucial for mitigating divertor heat loads and exploring enhanced confinement physics in the HL-2M tokamak. However, these scenarios with highly elongated plasmas face severe vertical displacement events that can lead to rapid plasma termination and potential device damage. Robust active control of vertical instability is therefore essential. As HL-2M lacks internal control coils, we developed two sets of vertical stabilization (VS) control systems, each employing a pair of external poloidal field (PF) coils, PF main power supplies, and VS power supplies. This paper details the first vertical stabilization (VS1) control system’s circuit diagram, hardware architecture, and software implementation and discusses issues encountered during commissioning and their solutions. By improving the internal hardware of the VS power supply, the voltage rise time was reduced to approximately 30 μs, resolving branch current imbalances. The transmission delay of the control signals is approximately 38 μs. Preliminary plasma experiments demonstrated effective vertical displacement control with the VS1 control system, achieving a maximum plasma elongation of 1.73 and typical control accuracy of ~20 mm. This work lays the foundation for robust control under high-parameter operational scenarios and the design and implementation of the higher-power second vertical stabilization (VS2) control system.