Power Supplies and Electronics Procedures

The HV power supplies and readout electronics associated with the HRS VDCs are all commercially designed. The reader is directed towards the manuals made available by the manufacturer for the detailed information not provided here.

The LeCroy HV power supply provides -1500 V nominal to the total absorber and 1200 V to the preshower. The power supply is located in the detector hut in a NIM bin on the upper level of the space frame. This unit may be controlled either manually or remotely via the EPICS control software, and also provides a monitor of the current drawn by each phototube to which it is attached. Connections from the power supply to the base are made using standard SHV connectors mounted on red RG-59/U HV cable good to 5 kV. Typical values of the high voltages are shown in the tables for both the pre-radiator and the total absorber.

If at all possible, the HV and LV power supplies should be left on continuously. This allows the tube noise to quiet down after high voltage is applied and the temperature of the base components stabilizes.

Figure 5.13: Typical values of the preshower counter high voltages.

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Figure 5.14: Typical values of the total absorption counterhigh voltages.

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