1. PHOBOS DATA FLOW (1) THE WIRES RHIC fec dmu mercury system event builder event buffer online data logger rcf slow control oracle db with disk TOF & Trigger Silicon VME HV...

2. Comments on data flow mercury system will have an ethernet connection to the DAQ Sun only. The calibration processes (during calibration runs) will run on the DAQ Sun. This task has been removed from the online computers. The calibration constants will be loaded from the DAQ Sun into the mercury system at the beginning of each run. They will be written back and this data go into the data flow. They (or a header with a pointer to it) will be stored in the db. The pedestal values will be treated as the calibration constants. All the time when the Silicons are powered, fec, dmu, mercury system and the event builder have to run as well, to control temperature and voltages. The data flow to/from the slow control system may change. During the discussions that lead to these displays nobody of the slow control was present.

3. PHOBOS DATA FLOW (2) online monitoring RHIC fec dmu mercury system event builder event buffer online slow control oracle db with disk Tof & Trigger Silicon VME HV... Signals Slow control variables (start/end of run) Noise/pedestals (start/end of run) Calibration constants (start/end of run) Geometry/electronic data

4. PHOBOS DATA FLOW (3) mercury system fec dmu mercury system event builder event buffer online data logger rcf slow control oracle db with disk Silicon Si slow control variables (temperature,…) initialization Noise, pedestals, calibration constants (only once/twice per run)

5. PHOBOS DATA FLOW (4) Slow control RHIC fec dmu mercury system event builder event buffer online data logger rcf slow control oracle db with disk Silicon VME HV... Start and end of run During running changes

6. PHOBOS DATA FLOW (5) data base RHIC mercury system online slow control oracle db with disk VME HV... Changes of slow control variables (no variables coming with FEC blocklet, eg Si temp) Noise, pedestal values used for zero suppression Calibration constants rcf Complete content event builder Geometry/electronic