The hadron calorimeter uses a readout system comprised of eight phototube which are sent to ADCs for digitization. During normal operation the phototubes should be kept under high voltage between -1200 and -1300 volts. Voltage on the phototubes should never exceed -1500 volts. In the event that the voltage on the calorimeter trips off due to an under or over voltage condition the shift personel should contact the appropriate HCal personel to have them reset the voltage levels.
Voltage levels for the Hadron Calorimeter are supplied from Mainframe 1 (Rack 5) Card 9 Channels 0-7. These are displayed on the high voltage monitor and are accessible via the high voltage control software. In addition to the calorimeter, two detector paddles are in operation for forming the muon trigger bits. Each of of these detectors uses a phototube readout that should be set at a nominal level of -1500 volts. The voltage on the phototubes should never exceed -1700 volts. In the event that the voltage on the muon counters trips off due to an under or over voltage condition the shift personel should contact the appropriate Muon counter personel to have them reset the voltage levels.
Voltage levels for the muon counter are supplied from Mainframe 1 (Rack 5) Card 9 Channels 8 and 9. These are displayed on the high voltage monitor and are accessible via the high voltage control software.
During run conditions the shift operators should examine the high voltage levels of 8 HCal phototubes and the 2 muon counter phototubes to ensure that all voltages are on and within range.
The shifter should compare the raw HCal ADC profiles to the standard distributions provided in the standard histogram collection for online monitoring.
Anomolies in the voltage levels or ADC profiles should be reported to the detector subgroup.
University of Virginia HEP |
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| Craig Dukes | Ken Nelson | L. Lu | Andrew Norman |
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