[Prex] [New Logentry] RC daily update

[tianye at jlab.org]

Logentry Text:
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Dear All,

We got beam back at 17:34 yesterday. Restored high current beam in the hall with C-1% target around 18:30. The beam spot on target was 166(x) x179(y) um. Then handed over to compton people for spectrum runs, Compton position and rate scan https://logbooks.jlab.org/entry/3797470, https://logbooks.jlab.org/entry/3797482. The updated Compton lock target position was enabled after that.  

We went back to production at 19:30. Beam ran well for a while then grew very trippy once Hall C came online. Around 20:58, the injector expert spent ~1.2 hour on adjusting A2 interception https://logbooks.jlab.org/entry/3797819 and HallC phase, after that, we went back to production immediately. With those injector adjustment, the Aq width was reduced to ~100ppm (280ppm before) and it was slightly ramped up to 280ppm again at this morning. However we are still happy with the current width. 

We had smooth production during the Owl shifts (average efficiency 79%).  

At MCC 8:00 am meeting, Yan proposed to do more A2 interception adjustment based on his investigation:https://logbooks.jlab.org/entry/3797819 to improve the Hall A Aq width (flat/stable), and also prevent the related beam trips in the future. 

The Plan for today is to keep running production, unless we get the decision from Caryn and Yan to adjust the A2 interception further based on their monitoring results from this morning (~1:00pm). 

Solved issue:

1) iocse10 lost 30Hz sync signal: https://logbooks.jlab.org/entry/3797674, which has been rebooted remotely this morning. 

Issue for the future:

1) Multiple "system" and "network" lights are blinking on the Hall A VESDA (fire and smoke) monitors, which was happened once during PREXII. Jessie talked to the expert about, and they confirmed that the system works fine with those blinking lights. They need 3-4 hours to reset them, so we could do that during next longer access and it isn't urgent right now.   

We will have our usual meeting upstairs in the counting house at 3:15 PM today.Bluejeans link for remote participants: https://bluejeans.com/256205934

Ye Tian(Hall A Run Coordinator)

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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/3797888
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