ECL Trigger System

The calorimeter is expected to generate fast trigger signals in order to provide a fully efficient trigger for both neutral and charged particles. Two kinds of trigger schemes are taken into account, namely a total energy trigger and a cluster counting trigger. These triggers are complementary each other since the former is sensitive to events with high electromagnetic energy deposits while the latter to multi-hadronic events that contain low energy clusters and minimum ionizing particles. Fig. shows the schematic diagram of the calorimeter signal flow and the electronics arrangement to perform the two trigger schemes.

Figure: Schematic diagram of ECL readout electronics.