A Medium Hadron Collider? Sorry, it's just not big enough

A particle accelerator that suffered the indignity of being downgraded to the second-most powerful in the world faced its final frontier yesterday. After 25 years at the cutting edge of scientific discovery, the American machine was unceremoniously switched off.

The Tevatron was completed in 1983 and used to discover the heaviest elementary particle in nature, the top quark, in 1995. But it recently lost a battle for US government funding because it was not as powerful as the Large Hadron Collider (LHC) at the Cern laboratory in Switzerland, and was deemed outdated.

By smashing particles together at almost the speed of light, engineers made a series of major discoveries at the sprawling six kilometre-long underground plant at Batavia, Illinois. But after 26 years of service and in a climate of falling science budgets, the Tevatron's designer, Dr Helen Edwards, yesterday pushed the button which diverted its last particle beam into a metal block and ended the career of a machine that was once the pride and joy of US physicists.

It is thought that the Fermi National Accelerator Laboratory, where the Tevatron is housed, will now turn its attention to experimenting with particles at high intensities instead of high energies.

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