[Hallc_running] [New Logentry] RC Update - 10am Tomorrow

[doug at jlab.org]

Logentry Text:
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Starting at 8:30 today beam stopped to resume work on the 5.5 pass separators. Up to that point beam quality had been good.

There is an ongoing problem with the Hall C tune mode generator (this was mentioned at 1:30 meeting and is logged at  https://logbooks.jlab.org/entry/3905769.   As noted in the log entry, they have a procedure that provide a temp fix the problem but this should be addressed next down.

By swing shift it was looking very promising that the 5.5 pass separation system was ready  but at 19:08 there was a down due to a "like momentary power interruption"  
https://cebaf.jlab.org/dtm/open-events?event_id=9951 and as of the writing of this message is still ongoing.

Once beam returns, we will cont. production running and will check with a scope the signals from the four Noble gas Cherenkokv PMT's on a scope to see if the gain from the lower two tubes has indeed dropped at the source.   (see https://logbooks.jlab.org/entry/3905847 which clearly shows the lower eff. of half of the detector)   Depending on what we see, we will plan a course of action tomorrow.

We will meet at 10:00 am on bluejeans - https://bluejeans.com/861439920


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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/3905908
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