CERN: LHC expects to restart within days

cern interiorProtons may whizz around the Large Hadron Collider (LHC) as early as this weekend, after a successful operation to fix a short circuit which had delayed its restart, according to Paul Collier, head of beams at CERN. CERN, Europe’s particle physics laboratory near Geneva, Switzerland, had planned to switch on the souped up collider last week after a two-year shutdown for upgrades (see LHC 2.0: A new view of the Universe). But the lab put its plans on hold after the machine developed a fault. Teams attributed the glitch to a piece of metal debris in a diode box, part of the safety system of one of the machine’s superconducting magnets. The debris short-circuited the magnet’s power supply. Engineers’ first attempt to remove the fragment appears to have been successful. On 30 March they sent an electrical discharge through the circuit to burn away the metal causing the fault. “It’s a bit like deliberately blowing a fuse,” says Collier. Read Article