5.5.5.8  Safety Assessment

The following potential hazards have been clearly identified.

The High Voltage System The LeCroy 1443 HV crate equipped with LeCroy 1461N negative high voltage cards supplies provides upto 3.3 kV of low current power. Red HV RG-59/U cable good to 5 kV with standard SHV connectors is used to connect the power supply to the photomultiplier tube voltage divider bases. A given base on the TA draws typically 500-600 microAmperes of current with the high voltage on at between 1400 and 1500 Volts. The PS bases typically draw 900 microamperes with the high voltage on at between 1100 and 1200 Volts.

The Lead Glass Support Structure The lead glass shower counters are mounted on top of the space frame for the detectors. Access for servicing the shower counters requires climbing on top of the support frame. Only the responsible personnel identified below should attempt to service the shower counter; such work requires proper safety precautions and prior training/experience.

The Lead Glass blocks The lead glass shower blocks and tubes are approximatley 70 - 80 pounds in weight apiece. Lifting, replacing, or moving such blocks should be done properly to avoid muscle problems and damage to the blocks.