Signals in the ZDC and Beam-Beam CounterPM marked ‘green‘ were operational, ‘red’ indicates a signal above threshold.

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Even so collisions were never achieved beam-gas collisions could be used to test the readout of different detectors.

Here the beam going from south to north (BLUE) hit patterns in the beam-beam Cherenkov counter. Green indicate active red a bit.

Signalks are also seen in the Zcal with these two being the future interaction and centrality trigger.

Because of the high background due to not optimized beams only a small fraction of the detector was operated.