In the relentless pursuit of harnessing fusion energy, a significant stride has been made by an international team of researchers, led by Yong-Su Na of Seoul National University. Their work, published in the journal *Nuclear Fusion* (formerly known as *Fusion Energy*), focuses on developing and optimizing operational scenarios for ITER and beyond, bringing us closer to the dream of a burning plasma.
The team, part of the International Tokamak Physics Activity (ITPA), has been diligently working since 2007 to advance what are known as integrated operation scenarios (IOS). These scenarios are complex, requiring a delicate balance of plasma physics, operation, and technology. “We’re essentially trying to control a star in a bottle,” Na explained, highlighting the intricate nature of the task.
The research involves using integrated modeling and control strategies to manage various aspects of tokamak operation, from plasma initiation to termination. This includes controlling plasma position and shape, managing magnetohydrodynamic (MHD) activities that could lead to disruptions, and handling power exhaust and plasma-wall interactions. The goal is to create scenarios that can be safely and effectively implemented in ITER, the world’s largest tokamak currently under construction in France.
One of the key achievements of this research is the development of ITER demonstration discharges by matching various dimensionless parameters. This means that the team has been able to simulate conditions in ITER, providing valuable insights into how the tokamak will behave once it’s operational. Additionally, they’ve developed scenarios for an ITER-like tungsten environment and deuterium-tritium (DT) operation, as well as scenarios for steady-state operations, which are crucial for ITER’s long-term goals.
The implications of this research extend beyond ITER. As Na pointed out, “Our work offers valuable insights and guidance for the next generation of fusion experiments and devices.” This could significantly accelerate the development of commercial fusion power, a clean and virtually limitless energy source.
The team has also identified outstanding issues and provided recommendations for further research and development. This includes evaluating and preparing actuators for ITER and developing integrated control solutions using shared actuators. These steps are crucial for ensuring the safe and efficient operation of ITER and future fusion devices.
In the broader context, this research is not just about updating the ITER Physics Basis. It’s about shaping the future of fusion energy, a field that could revolutionize the energy sector. As we stand on the precipice of a new era in energy production, the work of Na and his team serves as a beacon, guiding us towards a future powered by the same force that powers the stars.