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Just as CERN finished repairing the damage last September's Large Hadron Collider helium leak, a new problem cropped up.

Engineers discovered two vacuum leaks in areas of the enormous atom smasher that are supposed to be maintained at ultracold temperatures. They'll have to warm those areas up to complete the repairs, which will set back the project another couple of months.

Now, it won't be ready for new particle beams until mid-November. Late last year, CERN foresaw the LHC back up and running in July 2009. In February, the schedule was pushed back to September, and now we probably shouldn't expect actual particle beams until late November.



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