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DAQ and Trigger

The HPS Data Acquisition experiment data acquisition (DAQ) system handles all communication with the electronics acquisition of data for the three sub-detectors, manages the data flow from the detector front-end electronics to data storage on disk and the user interface in order to control the system. The software part is based on the software toolkit CODA developed at JLab whereas the hardware is based on VXS (for the ECal and Muon system) and ATCA (for the SVT) technology: the SVT, ECal and the Muon System. HPS employs two DAQ architectures: the SVT is readout with Advanced Telecom Communications Architecture (ATCA) hard- ware while the ECal and Muon System use VXS based hardware. The trigger system receives input from the ECal and Muon System, and distributes a trigger signal to all detector sub- systems to read out a selected event. Figure 21 gives a schematic block diagram of the DAQ system.