A technician walks under the core magnet of the CMS (Compact Muon Solenoid) experiment at the European Organization for Nuclear Research CERN (Centre Europeen de Recherche Nucleaire) in the French village of Cessy, near Geneva March 22, 2007. International physicists at a vast underground complex near Geneva launched a 20-year project on Wednesday to re-enact the "Big Bang" to try to explain the origins of the universe and how it came to harbor life.

Scientists look at a computer screen at the control centre of the CERN in Geneva September 10, 2008.

GENEVA, Sept. 20 (Xinhua) -- The world's most powerful particle collider has suffered a new problem and will be out of action for at least two months, the European Organization for Nuclear Research (CERN) said on Saturday.

CERN, the operator of the Large Hadron Collider (LHC), announced the news only 24 hours after saying that the big machine was back in business after repairs to a transformer.

The organization said the incident occurred at mid-day on Friday, resulting in a large helium leak into the tunnel containing the LHC, which was started with great fanfare earlier this month.

Preliminary investigations indicate that the most likely cause of the problem was a faultyelectrical connection between two magnets, which probably melted at high current leading to mechanical failure.

A sector of the 27-km circular tunnel, which was under the Swiss-French border, will now have to be warmed up well above absolute zero degrees Celsius so that repairs could be made, CERN said in a statement.

"This implies a minimum of two months down time for LHC operation. For the same fault, not uncommon in a normally conducting machine, the repair time would be a matter of days," the statement said.

International scientists at CERN seek to use the highly sophisticated instrument to recreate the conditions just after the Big Bang more than 13 billion years ago.

Through analysis of the results of powerful particle collisions, they were expected to unlock many secrets of modern physics and answer questions about the universe and its origins.