[Primexd] [New Comment] FCAL scalers

[gleasonc at jlab.org]

Comments:
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 - by gleasonc on Tue, 12/04/2018 - 16:32.

Note that this figure is - Note that this figure is looking downstream, so the right side of the FCAL is -X, and left side is +X. We were not able to take LED data as the DAQ was crashing.

Here are the channels with 0 scaler rate. I have looked at my notes and have checked these channels within the last month on the scope. 

X,Y
-7,-4 (new base this week in FCAL. Likely got disconnected during installation process.)
-24,7 (suspected bad fadc channel. We checked this last year and it was showing a signal prior to being plugged into the fadc module. Can double check channel on scope)
-26,-1(no signal at base, should replace base)
3,-29 (dead base)
26,0 (no signal at base)
12,26 (Need to check on scope).

There may also be one or two channels not listed here that are just noise, but still producing a signal. I think we have enough bases to replace all these channels (excluding -24,7). There are some more spares that may be ready to go into the FCAL for next week if needed. If there is planned access this week or next, I can go test two channels and make the known base replacements as needed. This will likely take ~1-2 hours total. If there is no access and it is requested (need to discuss with PrimeX experts), I can make a quick 5-10 minute access Wed/Thurs/Fri to replace the 1 channel close to the center of the FCAL (-7,-4) prior to taking pi0 data.

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Logentry Text:
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Snapshot of FCAL channels. Suspected channels with no signal show as white.

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