OXFORD, United Kingdom (Reuters) — A British fusion reactor, the ST40, has been turned on and officially achieved first plasma, says the company behind it – Tokamak Energy. The firm, based in Oxfordshire, aims to produce a record-breaking plasma temperature of 100 million degrees – seven times hotter than the center of the Sun and the temperature necessary for controlled fusion. Tokamak Energy, one of the world’s leading private fusion energy ventures, says it believes […]