UK Tokomak Energy startup has a test fusion reactor running

The UK's newest fusion reactor has been turned on for the first time and has officially achieved first plasma. The reactor aims to produce a record-breaking plasma temperature of 100 million degrees for a privately-funded venture. This is seven times hotter than the centre of the Sun and the temperature necessary for controlled fusion.

Oxford, England-based Tokamak Energy said today that with its ST40 reactor "up and running", the next steps are to complete the commissioning and installation of the full set of magnetic coils which are crucial to reaching the temperatures required for fusion. This will allow the ST40 to produce a plasma temperature of 15 million degrees - as hot as the center of the Sun - in the autumn of this year.

Tokamak Energy grew out of Culham Laboratory, home to JET - the world's most powerful tokamak - and the world's leading centre for magnetic fusion energy research. Tokamak Energy's technology revolves around high temperature superconducting (HTS) magnets, which allow for relatively low-power and small-size devices, but high performance and potentially widespread commercial deployment.

The world's first tokamak with exclusively HTS magnets - the ST25 HTS, Tokamak Energy's second reactor - demonstrated 29 hours continuous plasma during the Royal Society Summer Science Exhibition in London in 2015 - a world record.