[Dsg-halla_ecal] ECAL heater controls status

[Marc Mcmullen]

Hi Don,

With the work year coming to an end I just wanted give a quick status of the heater controls for the ECAL.My last day will for the year will be 12/18, and I'll return after the holiday break.

The controls rack has been assembled with all four expansion channels, with ~190 thermocouple terminal blocks for channel control, crystal and lightguide temperature readback. Additionally, there are 16 PSICs in EEL 125 ready to be moved to Hall A.

I am planning on wrapping up the shelf with the safety system components tomorrow. The shelf contains the 3 omegas for over-temperature safety, the watchdog relay, a power relay, and a connection for the hall emergency crash button. The emergency crash button for the hall has a pass-through connection which will be connected the emergency crash button in the counting house (after it has been installed). DSG will install the safety system shelf in the controls rack after it has been relocated to Hall A.

The main cRIO has been reinstalled in the counting house. A service request has been submitted to add it and all the other cRIO expansion units, plus a switch to the Hall A network.

I also have touched bases with the Hall A work coordinator and have been assured that moving the controls rack, the PSICs, and a shelf with three of the power supplies will happen at the appropriate time.

When I return, I will start by testing the safety system to ensure it works with the heater controls in the hall.

At some point your group will have connected and run the heater power cables and thermocouple multi-condutors to the bunker and DSG can start connecting and testing the controls before we actually heat the system up.

Before we start testing, lets plan a meeting to discuss low temperature testing and start up procedure after everyone returns from the holiday shutdown.

Regards,
Marc




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