South Korean KSTAR Reactor Achieves Fusion Plasma Milestone

South Korea’s KSTAR reactor has achieved a significant breakthrough in nuclear fusion research, maintaining stable plasma at fusion temperatures for an unprecedented 102 seconds. Operated by the Korea Institute of Fusion Energy (KFE), the KSTAR aims to demonstrate the viability of commercial-scale fusion energy. This latest achievement marks a crucial step forward in overcoming the challenges of controlling and sustaining the extreme conditions required for fusion.

Key Developments

The KSTAR team successfully sustained plasma in a high-confinement mode (H-mode) for 102 seconds. During this period, the plasma temperature was maintained at 100 million degrees Celsius for 48 seconds. These figures represent a new record and are essential for achieving net energy gain in fusion reactors.

Maintaining plasma at such extreme temperatures is fundamental to fusion energy. At these temperatures, ionized deuterium and tritium nuclei possess enough kinetic energy to overcome their natural electrical repulsion and fuse, releasing vast amounts of energy. However, managing plasma at these conditions is exceptionally complex. Magnetic confinement reactors like KSTAR utilize sophisticated high-power magnet systems to contain the superheated ionized fuel.

A significant factor in KSTAR’s recent success is the implementation of a new tungsten divertor. This component, made of stainless steel with tungsten shields, is designed to withstand the high-energy neutron bombardment from the plasma. The tungsten shields absorb the plasma’s kinetic energy, converting it into heat, which is then dissipated by water circulating within the divertor. Tungsten was chosen for its exceptionally high melting point of 3,422 degrees Celsius, making it ideal for the plasma-facing surfaces. The divertor also plays a critical role in purifying the plasma by removing ash and impurities generated during the fusion reaction and plasma-wall interactions.

The KFE noted that the previous carbon divertor had reached its operational limits as experiments intensified and temperatures increased. The next ambitious goal for KSTAR is to operate the reactor for 300 seconds at temperatures exceeding 100 million degrees Celsius.

Why This Matters

This advancement by the KSTAR reactor is a critical development in the global pursuit of clean and virtually limitless fusion energy. By successfully extending the duration of stable, high-temperature plasma confinement, researchers are moving closer to overcoming major engineering hurdles. The ability to sustain these conditions for longer periods is essential for transitioning fusion power from experimental research to a practical energy source. While generating more energy than consumed remains a significant challenge, milestones like this fuel optimism and demonstrate tangible progress in fusion science and technology.

Datos clave
| Aspecto | Detalle |
|—|—|
| Reactor | KSTAR (Korea Superconducting Tokamak Advanced Research) |
| Institución Operadora | Korea Institute of Fusion Energy (KFE) |
| Logro | Mantenimiento de plasma estable a 100 millones °C durante 102 segundos |
| Componente Clave | Nuevo divertor de tungsteno |
| Próximo Objetivo | Operar durante 300 segundos a temperaturas superiores a 100 millones °C |

Fuente: Fusión nuclear: el reactor surcoreano KSTAR ha reescrito los límites de lo posible (Xataka) – https://www.xataka.com/energia/fusion-nuclear-reactor-surcoreano-kstar-ha-reescrito-limites-posible

Datos clave