CERN Collides Particles at New Record Energy

Nov 26, 2015

CERN Press Office in Geneva, 25 November 2015.
After the successful restart of the Large Hadron Collider and its first months of data taking with proton collisions at a new energy frontier, the LHC is moving to a new phase, with the first lead-ion collisions of season 2 at an energy about twice as high as that of any previous collider experiment. Following a period of intense activity to re-configure the LHC and its chain of accelerators for heavy ion beams, CERN1’s accelerator specialists put the beams into collision for the first time in the early morning of 17 November 2015 and ‘stable beams’ were declared at 10.59am today, marking the start of a one-month run with positively charged lead ions: lead atoms stripped of electrons. The four large LHC experiments will all take data over this campaign, including LHCb, which will record this kind of collision for the first time. Colliding lead ions allows the LHC experiments to study a state of matter that existed shortly after the big bang, reaching a temperature of several trillion degrees.

“It is a tradition to collide ions over one month every year as part of our diverse research programme at the LHC,” said CERN Director General Rolf Heuer. “This year however is special as we reach a new energy and will explore matter at an even earlier stage of our universe.”

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4 comments on “CERN Collides Particles at New Record Energy

  • Temperature of a set of independent particles is a measure of kinetic energy of say the molecules involved, translational, rotational, vibrational summed and then averaged in a population of molecules in the normal understanding of the word.

    In a highly accelerated particle we need only consider its huge translational KE as defining its temperature. It is consistent to look at two colliding particles at the moment of collision (when they cease to be independent) as having a temperature of the summed KEs.



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