see some photographs from the ALICE Control Room (23-11-2009)
16:47 Two beams circulating in the LHC
16:47 Within seconds the first event (see above) from colliding proton beams is showing up on the ALICE detector event display.
A handful of tracks have been reconstructed in the Silicon Pixel Detector (SPD) pointing back to a unique vertex.
Events keep "pouring in" at a rate of about 10 per minute. The LHC operators must have managed a direct hit between the two beams immediately! Well done folks! Great work!
Over the next 40 minutes almost 300 events showed up.
Primary vertex distribution (the point where the interactions happened) in the transverse plane (xy) and along the beam axis (z) reconstructed in real time by the Online Computer Farm of the High Level Trigger. The histograms contain 191 events.
Here is another example of a nice event !! (Run 101498, Event 48, 16:58:48)