[PRad] [Revised Logentry] Possible damage on ADC boards by the short circuits from lead glass dynodes & bossters

[cpeng at jlab.org]

Logentry Text:
--
After we checked the boosters and plug back the connectors from boosters to HyCal, the possible short circuits may cause damage to 3 ADC channels that connect to lead glass modules:
G486, Crate 4, Slot 8, Channel 52
G572, Crate 4, Slot 8, Channel 38
G25, Crate 6, Slot 19, Channel 53
As shown in the screen shot, now the ADC1881M boards do not send out the data words for the above channels.
The pedestal of other channels in the two ADC boards at crate 4, slot 8 and crate 6, slot 19 is increased significantly.
Besides, the channel W191 (Crate 5, Slot 23, Channel 17) does not work properly, but we believe it might be due to the loose connection and is irrelevant to the issue above.

After this happened, we are able to see the dynode signal from lead glass group and gain-equalized the module G273.
We plan tol continue the gain equalizing for crystal modules tonight and check the 4 problematic channels on Monday when the beam is off.

---

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/3405897
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mailman.jlab.org/pipermail/prad/attachments/20160522/995cbce1/attachment-0001.html>