[Halld-cal] [New Logentry] BCAL pedestals monitored overnight again

[dalton at jlab.org]

Logentry Text:
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The BCAL pedestals were monitored overnight again, with all voltages nominal.  The features are very similar to what was found yesterday.  There is a periodic drift with approximately 3 hour period.  This is seen to varying degrees on all channels.  This does not seem to be correlated with the voltage or temperature at the BCAL readout modules.  There is a potential correlation with the temperature on the crates, which presumably depends on the temperature in the hall.  Figures 3 through 5 show the temperatures on various sensors on the crates which were also read out overnight.  The time range of the two data sets correspond roughly, but not exactly.

The same two channels as previously again show glitches.  Again there is a step up of about 3 channels for (roc,slot,chan)=(32,3,11) and about 5 channels for (32,5,8).  This time the glitch occurred just before 6:30 am.

We are now taking data with the HV and LV of the detectors off in order to further isolate the source.  



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This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/3285542
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