Page History

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6:30 p.m.
L1t, L6t and L6b modules have been tested with the single-FEB setup. All OK.

1/15/2015

11:00am
Ohming out the L1t power connection revealed a short on the long cable between the breakout boxes between DIG power and the metallic braid. This together with the fact that the SVT box, and therefore hybrid grounds, was not isolated from the optical table most likely caused a current path from the braid to the breakout box and onto the detector. This is why connecting the FEB to hybrids made the difference; it is otherwise isolated from the SVT box. 
The long cable (P1) is being reworked now and ready today most likely.

12:00pm
The L6b FEB was mounted and the link was working fine. To fully test it we slide it in to be able to connect to the right detectors and it is still fine. Data cable not seated correctly might be the explanation. We didn't power any other FEB that share the same flange to see if that was an issue but given that other FEBs worked means we will take that risk. 
The plan is to extract these two boards and get them reworked. Then have all 10 FEBs and the octopus cleaned and mounted back on the cooling plate as soon as possible. Before sliding the cold plate in we would like to power all FEBs and walk through each one with a set of spare hybrids to make sure things are working. 

1/16/2015

9:45am
Finished Ohming out the HV connections from the PS to the last REDEL connecting to the patch panel. No issue was found. What is left to do is to verify the GUI to physical hybrid mapping. This will be done once we have the patch panel attached.

Equipment

Interlock board

see Group C interlock board for instructions on monitoring and controls.

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