Large Helical Device

• Design finalized 1987 • Start of construction 1990 • Plasma operations from 1998 • Neutral beam injection of 3 MW was used in 1999. • In 2005 it maintained a plasma for 3,900 seconds. • In 2006 a new helium cooler was added. Using the new cooler, by 2018 a total of 10 long term operations have been achieved, reaching a maximum power level of 11.833 kA. • To aid public acceptance, an exhaust system was designed to catch and filter the radioactive tritium the fusion process produces. • The Large Helical Device experiment was concluded on Christmas Day of 2025 after more than 27 years of operation. ==See also==