LHC run ends with 25ns bunch spacing

Remarkable first three-year LHC run crowned by a new performance milestone

LHC run ends with 25ns bunch spacing

The final beam of the three-year proton run at the LHC is dumped, with the phrase "So long and thanks for all the fish" (Image: CERN)

This morning CERN teams brought the first proton run at the Large Hadron Collider to an end with the message "So long and thanks for all the fish," - a phrase made famous by British writer Douglas Adams in his Hitchhiker's Guide to the Galaxy series. The remarkable first three-year run of the LHC was crowned by a new performance milestone. The space between proton bunches in the beams was halved to 25ns in order to deliver increased beam intensity and the accelerator’s luminosity.

“This new achievement augurs well for the next LHC run starting in 2015," says CERN's head of accelerators and technology, Steve Myers. "High-intensity beams are vital for the success of the LHC programme. More intense beams mean more collisions and a better chance of observing rare phenomena.”

Of the 6 million billion proton-proton collisions generated by the LHC, the ATLAS and CMS experiments have each recorded around 5 billion collisions of interest over the last three years. Of these, only around 400 produced signatures compatible with the Higgs-like particle whose discovery was announced in July.

Read the press release