In a significant stride towards advancing fusion energy research, scientists have successfully validated the predictive capabilities of the DYON code for plasma initiation in the Experimental Advanced Superconducting Tokamak (EAST). This breakthrough, published in the journal “Published in ‘Nuclear Fusion’,” marks a crucial step in understanding and optimizing plasma initiation processes, particularly relevant for future fusion reactors like ITER.
Lead author Runze Chen, affiliated with the Institute of Plasma Physics at the Hefei Institutes of Physical Science, Chinese Academy of Sciences, and the University of Science and Technology of China, explains, “Our study demonstrates that the DYON code can accurately reproduce the operating spaces of loop voltage and prefill gas pressure for ohmic discharges in EAST. This is a significant validation of the code’s predictive power, which is essential for planning and executing successful plasma initiation in fusion devices.”
The research also delves into the impact of wall conditioning on plasma initiation, utilizing newly developed physical sputtering models for Boron and Lithium. The findings reveal that discharges following boronisation of the wall are more susceptible to plasma burn-through failure compared to those after lithium-coating. This is attributed to the higher radiative power coefficients of Boron, leading to increased radiative energy loss rates.
Chen notes, “Even a small amount of Boron content in the prefilled gas, possibly remaining after boronisation, can lead to excessive radiation energy losses and failure of plasma burn-through. Our simulations show that for successful plasma burn-through with 1.5% initial boron content, an additional 10 kW of Electron Cyclotron (EC) power absorption is required.”
The implications of this research are profound for the energy sector. As the world seeks to transition towards cleaner and more sustainable energy sources, fusion energy holds immense promise. The validation of the DYON code and the development of physical sputtering models provide valuable tools for optimizing plasma initiation processes, ultimately contributing to the development of more efficient and reliable fusion reactors.
Moreover, the insights gained from this study can inform the design and operation of future fusion devices, including ITER, which shares similar characteristics with EAST. By understanding the role of wall conditioning and the impact of different coatings on plasma initiation, researchers can make informed decisions to enhance the performance and reliability of fusion reactors.
In the broader context, this research underscores the importance of international collaboration and the sharing of knowledge in the pursuit of fusion energy. As Chen emphasizes, “Our work highlights the need for continued research and development in plasma initiation and wall conditioning, which are critical for the success of fusion energy.”
With the validation of the DYON code and the development of new physical sputtering models, the scientific community is better equipped to tackle the challenges of plasma initiation and wall conditioning. This progress brings us one step closer to realizing the full potential of fusion energy, offering a clean, sustainable, and virtually limitless energy source for future generations.