[Hallc_running] [New Logentry] Hall C RC update: 10/22/2021

mack at jlab.org mack at jlab.org
Fri Oct 22 09:15:01 EDT 2021

Logentry Text:
If you recall, beam came back around 2am on Thursday. We then had production for roughly half a day until the next bump in the road. (axle-breaking pothole, whatever) 

We've been down since ~3pm Thursday due to a ground fault in Arc 7. The PD, Markus D, called around 7:15pm Thursday and said it is thought to be in the downstairs magnets and not in the upstairs power supply. So Hall C and D are down hard until probably Friday late day or early swing. This time estimate has considerable uncertainty. If they don't quickly find a smoking gun when they get into the tunnel, then because there is a large number of magnets in series in Arc 7, Sarin P noted they'll have to start disconnecting power cables and do a binary search. Ugh. Reality!

We always need the TO. As for Friday day shift, the SL and remote worker were informed to go Standby as soon as I had an updated time estimate at the 8am meeting. 

Hall A pass change now possibly moved to Sunday. Secretary of Energy tour on Monday morning. 

The running total of pions is 4127.

We will have an RC meeting tomorrow/Friday at 10am.

Bluejeans link: https://bluejeans.com/861439920
RC meeting page: https://hallcweb.jlab.org/wiki/index.php/RC_Meeting,_Friday,_October_22_,_2021


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/3930293
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