Scientists switched on the world's largest atom smasher Friday night for the first time since the $10 billion machine suffered a spectacular failure more than a year ago.
It took a year of repairs before beams of protons circulated late Friday in the Large Hadron Collider for the first time since it was heavily damaged by a simple electrical fault.
Progress on restarting the machine, on the border between Switzerland and France, went faster than expected the first beam started circulating in a clockwise direction around the machine about 10 p.m., said James Gillies, spokesman for the European Organization for Nuclear Research.
Circulation of the beams was a significant leap forward.
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