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Fermilab plans September 10 “Pajama Party” to witness first beam at LHC

Batavia, Ill. — Journalists and guests are invited to witness the start-up of the Large Hadron Collider live and in real time at the LHC Remote Operations Center at the Department of Energy’s Fermilab, in Batavia, Illinois in the early morning hours at 1:30 a.m. CDT on Wednesday, September 10. A celebration breakfast will be served following the LHC start-up.

Journalists planning to attend the First-Beam Pajama Party at Fermilab are asked to call the Fermilab Office of Communication at 630-840-2326 or e-mail

On September 10, scientists at the Large Hadron Collider in Geneva, Switzerland will attempt for the first time to send a proton beam around the 27-kilometer-long tunnel of the world’s most powerful particle accelerator. Live connections between CERN and Fermilab’s LHC Remote Operations Center will follow the action in Switzerland as it happens.

Beam will begin circulating at about 9 a.m. local time in Switzerland. Due to the time difference between Geneva and Chicago, first beam will occur at about 2 a.m. Chicago time. To allow journalists and guests to watch LHC first-beam operations as they happen, Fermilab will host a “pajama party” at the laboratory, beginning at 1:30 a.m. on Wednesday, September 10.

Fermilab will broadcast a live satellite feed from CERN. Computers in the Remote Operations Center at Fermilab will monitor operations. Scientists from the LHC experiments, CMS and ATLAS, along with accelerator experts, will be on hand to explain first-beam events.

Information about the event is available at More information about U.S. participation in the LHC and its experiments is available at