• Created by Unknown User (hovanes), last modified on Oct 15, 2013

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Time and Location

3pm Eastern time

Room F228 in F-wing at JLab

Agenda

Minutes

Present at JLab: Krister, Stepan, Nerses, Hovanes

Present at SLAC: Sho, Pelle

SVT Interlock

Hovanes presented some ideas on implementing the SVT interlocks. The main point was that if we do not need an interlock system that shuts off the SVT power supplies and the SVT chiller, then we could use Allen-Bradley PLC for the interlocks since he thinks it will be relatively easy  and reliable system.

Pelle and Sho said that they discussed the issue of the interlock delay with other SVT experts and they did not see any problem with 100ms delay for the interlocks.

Stepan suggested to get an estimated from a dealer to see what the savings are.Hovanes will try to get an estimate for a system with modules for interlocks only, and also for a configuration with some thermocouples (24 to be precise).

Krister asked if it wa possible to use PLC for stepper motor as well. According to Hovanes, it is possible, but interfacing with EPICS will not be simple. Stepan also thought it would be the best to keep the OMS-based system for the HPS since there is not enough time for developing and testing a new system for HPS when we have a working system from CLAS.

Krister and Pelle also suggested that a similar system can be custom-made using chassis with microcontrollers.

ECAL scaler readout

The question was raised by Hovanes and was if the scalers from ECAL will be coming from the FADC250 or the JLab discriminators to be able to prioritize the efforts for EPICS driver developments.

Stepan said that there has not been a final decision to keep or drop the JLab discriminators from ECAL, but he thought that we would gain little by keeping them. Therefore, the  we decide to conside FADC250 scaler implementation in EPICS as a high priority item

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