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Scientists react as they stand in front of a screen at the European Organisation for Nuclear Research (CERN) control center of the ATLAS detectors during the restart of the Large Hadron Collider (LHC) near Geneva. Two circulating beams produced the first particle collisions in the world's biggest atom smasher, the Large Hadron Collider, three days after it was restarted, scientists announced.
In a statement, the European Organisation for Nuclear Research (CERN) said two beams circulating simultaneously led to collisions at all four detection points during the afternoon and evening.
"It's a great achievement to have come this far in so short a time," said CERN director general Rolf Heuer. "But we need to keep a sense of perspective. There's still much to do before we can start the LHC physics programme."
CERN had declared earlier Monday the relaunch of the 3.9 billion euro (five billion dollar) collider "an enormous success," after it was out of action for 14 months due to a serious electrical fault.