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Alice events from first LHC Ion Beams

During the weekend 23-25 October 2009, LHC was injecting proton and ion beams into ALICE. These are events collected by the SPD in self-triggering mode (Pb ion interactions with the LHC monitoring screen).

SDD data SDD data SDD data

Left : Run 92918 Ev 59 (23-10-09, 21:35) Pixel hit multiplicity: 24006 Middle: Run 92917 Ev 66 (23-10-09, 21:06) Pixel hit multiplicity: 10217 Right : Run 92918 Ev 72 (23-10-09, 21:46) Pixel hit multiplicity: 9478