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Last Saturday evening, the 7th of November 2009, at around 8 p.m., after passing through the LHCb detector, for the first time since last year's incident, protons arrived at the doorstep of the CMS experiment, thus completing half the journey around the LHC's circumference.
Low energy protons from the LHC were dumped in a collimator just upstream of the CMS cavern. The calorimeters and the muon chambers of the experiment saw the tracks left by particles coming from the dumping point (a so-called 'splash event', see images). During the rest of the weekend, bunches of protons were also sent in the clockwise direction passing through the ALICE detector and were dumped at point 3.
More information at http://lhcatpic.blogspot.com/
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