German Fusion Reactor Hits 1 Million Degrees in Breakthrough Experiment

Scientists at the Wendelstein 7-X facility achieved a major milestone by heating helium gas to one million degrees Celsius in their first plasma experiment. This experimental reactor, designed for plasma research, has been pushing the boundaries of nuclear fusion technology for years. Its unique design and advanced systems have already set multiple records in the field.

Construction of the Wendelstein 7-X began in April 2005 and was completed nine years later in May 2014. The facility features a torus-shaped chamber surrounded by 50 superconducting magnetic coils, each intricately twisted to contain plasma in a complex, ring-like shape. These coils were precisely calculated using a supercomputer to optimise plasma confinement.

The first plasma was ignited on December 10, 2015, marking the reactor’s official activation. Just two months later, in February 2016, then-Chancellor Angela Merkel oversaw the generation of the first hydrogen plasma—a key step in fusion research. Unlike the Sun’s core, where extreme pressure enables fusion at lower temperatures, Earth-based experiments must reach far higher temperatures to trigger the process. Nuclear fusion works by forcing hydrogen isotopes—deuterium and tritium—to combine into a helium nucleus. This reaction releases vast amounts of energy along with neutrons. The Wendelstein 7-X continues to refine these conditions, aiming to make fusion a viable energy source in the future.

The Wendelstein 7-X has already broken new ground in fusion science, with its twisted magnetic coils and record-breaking plasma experiments. By heating helium to extreme temperatures and sustaining controlled reactions, the facility provides critical data for future energy solutions. Researchers remain focused on improving efficiency and stability in the quest for practical fusion power.