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LHC collides protons with lead ions for the first time

Excerpt: At 1.26am today the Large Hadron Collider (LHC) collided protons with lead ions for the first time.

The switch to colliding different types of particle, rather than like with like, presents technical challenges. "First of all, the collisions are asymmetric in energy which presents a challenge for the experiments," says accelerator physicist and lead-ion team leader John Jowett.  "At the accelerator level we don’t really see the difference in particle size but the difference in the beam size and the fact that the beam sizes change at different rates may affect how they behave in collisions."



Read more at: http://public.web.cern.ch/public/

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