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Lasers & Sources

Hadron startup delayed until next year

The world's newest and largest particle accelerator, the Large Hadron Collider, will not begin operations again until April, officials at the European Center for Nuclear Research said last week. Two weeks ago, the center for nuclear research, which is outside Geneva, sent the first beams of protons around the machine's 17-mile-long underground racetrack.

But last Friday the machine was shut down after an electrical connection between two of the superconducting electromagnets that steer the protons suffered a so-called quench, heating up, melting and leaking helium into the collider tunnel. Liquid helium is used to cool the magnets to superconducting temperatures of only about 3.5 degrees Fahrenheit above absolute zero. Stray heat can cause the magnets to lose their superconductivity with potentially disastrous consequences.

Full story from New York Times