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We have two decarad systems. Each consists of 10 small Geiger-Mueller (GM) radiation detecting heads that are connected (signal & high voltage (HV)) to a central unit which has some brains to control the HV level and read out the measured dose rates. The plan is to mount these to two frames that will be positioned near cryomodules during RF commissioning to measure radiation. The systems will be moved every day or two as we commission all cavities. The systems were designed and built at JLab and used for many years. The decarads are talked to through a DB9 connector connected to a Digi Portserver. The software uses EPICS ASYN and Stream Device to send the commands to set the HV or , read back the measurements, etc. The software is part of the RadiationMonitoring slac epics package. The proposed software is currently in afs:
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| PV Name | Purpose | Save/restore | Archive |
|---|---|---|---|
| $(P):Firmware | read firmware number | ||
| $(P):HeartBeat | read heartbeat | 10s | |
| $(P):HVStatus | read status of high voltage | 10s | |
| $(P):TemperatureTemp | read temperature of chassis | 10s | |
| $(P):HVMonitor | high voltage reading (V) | 10s | |
| $(P):HVSetPointHVSetpt | high voltage setting (V) | yes | 10s |
| $(P):RackPosition | String to hold a description of the rack position | yes | |
| $(P):nn:DoseRate | read back of dose from GM tube nn (01-10) in mR/hr (close enough, it saturates about xxx) | 1s | |
| $(P):nn:Position | string to hold a description of the position of GM tube number nn | yes | |
| $(P):Sequence | sequence to readout the PVs at 1 Hz. The SEQ record has a delay of 0.06 seconds between sending 1 to each PV's PROC field so commands don't collide in the cable |
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